Quick Search
Ethylene Vinyl Acetate (EVA) copolymers, commonly abbreviated as EVA, are a family of thermoplastic copolymers obtained as a result of the copolymerization of ethylene and vinyl acetate. It is called Ethylene Vinyl Acetate Copolymers in Turkish. EVA; It combines the processability and chemical resistance of polyethylene with the flexibility, polarity, adhesion and low temperature performance provided by vinyl acetate units in the same polymer structure.
Ethylene Vinyl Acetate (EVA) copolymers are not a single standard polymer. Commercial EVA grades can differ significantly from each other, especially in vinyl acetate ratio, molecular weight, melt flow index, density, melt behavior and additive package. Therefore, the mere expression "EVA" is not sufficient for technical purchase.
The commonly used CAS No for Ethylene Vinyl Acetate (EVA) copolymers is 24937-78-8. However, due to its polymer structure, it is not correct to define a single precise molecular formula or a single molecular weight. The polymer chain consists of ethylene and vinyl acetate repeat units, and their ratio varies by commercial grade.
The proportion of vinyl acetate is one of the most important structural parameters of Ethylene Vinyl Acetate (EVA) copolymers. As the amount of vinyl acetate increases, the polymer becomes softer, more flexible, and more polar overall; while the degree of crystallization and melting temperature generally decrease. At the same time, adhesion to polar surfaces and compatibility with various resins, waxes, and additives may improve.
Grades of Ethylene Vinyl Acetate (EVA) copolymers containing low vinyl acetate show closer mechanical and thermal behavior to polyethylene, while grades containing medium and high vinyl acetate may exhibit more flexible and rubbery character. Ethylene-vinyl acetate materials with very high vinyl acetate content may approach elastomeric behavior.
The other important quality parameter of Ethylene Vinyl Acetate (EVA) copolymers is the melt flow index. EVA with a low melt flow index can show higher molecular weight and higher melt viscosity; it can be used in extrusion applications such as films, profiles, cables, and so on. EVA with a high melt flow index, on the other hand, flows more easily and can be advantageous in hot melt adhesive, coating, or special compound applications.
The Ethylene Vinyl Acetate (EVA) copolymers product family includes commercial grades containing approximately 9% to 40% vinyl acetate and with very wide melt flow ranges. This clearly shows that EVA is not a single product, but a broad family of copolymers designed for the application.
A commercial EVA grade containing 18% vinyl acetate, such as Ethylene Vinyl Acetate (EVA) copolymers, may show a density of approximately 0.941 g/cm³, a melt flow index of 2.5 g/10 minutes, and a melting point of approximately 88 °C. Another grade of EVA with the same 18% vinyl acetate ratio may have a melt flow index of 0.7 or 30 g/10 minutes. Therefore, it cannot be said that the two EVA grades are equivalent just by looking at the vinyl acetate ratio.
Ethylene Vinyl Acetate (EVA) copolymers; It is widely used in flexible packaging film, hot melt adhesives, shoe sole and foams, cable compounds, coating and lamination, solar panel encapsulation films, hose, molding products and different polymer mixtures.
When purchasing, vinyl acetate ratio, melt flow index, density, melting point, additive package, optical properties, mechanical properties, process method and legislation documents for the final application should be evaluated together.
WHAT IS ETHYLENE VINYL ACETATE (EVA) COPOLYMERS?
Ethylene Vinyl Acetate (EVA) copolymers are a family of thermoplastic copolymers produced from ethylene and vinyl acetate monomers.
The main monomers are ethylene and vinyl acetate. Ethylene gives the polymer chain a polyethylene-like hydrocarbon character.
Vinyl acetate units, on the other hand, increase polarity by adding acetate side groups to the polymer chain.
The simplified structure of EVA can be shown as ethylene and vinyl acetate repeat units being found together in the same polymer chain.
Ethylene repeat unit: –CH₂–CH₂–
Vinyl acetate repeat unit is: –CH₂–CH(OCOCH₃)–.
In the actual commercial EVA chain, these two repeat units coexist with a certain distribution.
The common CAS number for Ethylene Vinyl Acetate (EVA) copolymers is 24937-78-8.
There is a registration on PubChem under this CAS number under the name Poly(ethylene-co-vinyl acetate).
Since Ethylene Vinyl Acetate (EVA) copolymers are a polymer, there is no single exact molecular weight.
For the same reason, it is not correct to give a single molecular formula for all EVA grades.
The primary parameters that determine the polymer's properties are:
Vinyl acetate ratio
Molecular weight and molecular weight distribution
Melt flow index
Density
Degree of crystallization
Melting temperature
Contribution package
Commercial grade designed for manufacturing and processing
As the vinyl acetate ratio of EVA increases, the regular formation of polyethylene crystals becomes more difficult.
The degree of crystallization is usually reduced as a result of this.
The polymer becomes softer and more flexible.
The melting temperature may decrease.
Low-temperature flexibility can develop.
Polarity may increase.
Adhesion to polar surfaces may develop.
Optical clarity may increase in some grades.
However, mechanical stiffness and rigidity may decrease.
The vinyl acetate ratio alone does not determine all properties.
For example, the melt flow indexes of two commercial EVA grades with the same 18% VA ratio can be very different.
Ethylene Vinyl Acetate (EVA) copolymers have a melt flow index of about 18% VA and 0.7 g/10 minutes, while ELVAX™ 3176 has a melt flow index of 30 g/10 minutes at the same level of about 18% VA.
This difference indicates that the flow and process behavior of the two products are significantly different.
For this reason, at least two basic data should be evaluated together in EVA product selection:
Vinyl acetate ratio
Melt flow index
In addition to these, density, melting temperature, hardness, tensile properties, optical properties and additive package should also be evaluated according to the application.
COMMON PRODUCT AND CHEMICAL NAMES
Ethylene Vinyl Acetate Copolymer
Ethylene-Vinyl Acetate Copolymer
Ethylene Vinyl Acetate Copolymer
EVA Copolymer
EVA Copolymer
EVA Resin
EVA Resin
Poly(ethylene-co-vinyl acetate)
Ethylene-Vinyl Acetate Copolymer
Polyethylene Vinyl Acetate
PEVA
CAS 24937-78-8
EVA
CAS NO, EC / EINECS NO AND CHEMICAL IDENTIFICATION
Product Name: Ethylene Vinyl Acetate (EVA) copolymers
Turkish name: Ethylene Vinyl Acetate Copolymers
Common abbreviation: EVA
Polymer name: Poly(ethylene-co-vinyl acetate)
CAS No: 24937-78-8
Chemical class: Thermoplastic ethylene copolymer
Main monomers: Ethylene and Vinyl Acetate
Single molecular formula: Not defined
Single molecular weight: Not defined
Physical form: Usually pellets or granules according to commercial grade
Color: Usually colorless-white or translucent in natural grades
Vinyl acetate ratio: Varies by commercial grade
Melt flow index: Varies widely according to commercial grade
Density: Depends on vinyl acetate ratio and grade
Melting temperature: Vinyl acetate ratio, molecular structure and grade dependent
It is not appropriate to forcibly apply the single EC/EINECS number of Ethylene Vinyl Acetate (EVA) copolymers to all commercial polymer grades. The status of polymers in European chemical legislation is assessed differently from monomers and low molecular weight substances.
For this reason, exact manufacturer SDS and regulatory compliance documents should be used in purchasing and regulatory evaluation.
The Celanese Ateva product family is a useful example to illustrate the variety of commercial EVAs.
The product family includes about:
9% VA
12% VA
16–20% VA
26–28% VA
33% VA
40% VA
There are different EVA classes at levels.
The melt flow index can also range from as low as about 0.35 g/10 min to hundreds of g/10 min.
These values are not general fixed characteristics of the EVA, but rather examples of commercial products in the specific manufacturer's portfolio.
CHEMICAL STRUCTURE AND MOLECULAR PROPERTIES OF ETHYLENE VINYL ACETATE (EVA) COPOLYMERS
The basic structure of Ethylene Vinyl Acetate (EVA) copolymers is formed by the incorporation of vinyl acetate repeat units into the ethylene main chain.
Ethylene units form low-polarity hydrocarbon segments in the polymer chain.
Vinyl acetate repeat units carry acetate side groups.
These acetate groups increase the polarity of the polymer.
Polyethylene chains can be packed in a fairly orderly manner and form crystalline regions.
Vinyl acetate units break this regularity in the chain.
Therefore, an increase in the vinyl acetate ratio generally reduces the degree of crystallization.
The reduction of crystallization significantly alters the mechanical and thermal behavior of EVA.
As a general trend, as the amount of vinyl acetate increases:
Flexibility increases.
Softness increases.
Polarity increases.
Adhesion ability may improve.
Low temperature behavior may develop.
Crystallization decreases.
The melting temperature may decrease.
Rigidity may decrease.
In contrast, EVA grades with low VA content show more polyethylene-like behavior.
These grades can exhibit higher hardness, higher crystallization, and higher melting temperature.
EVA with a high vinyl acetate content becomes more amorphous and flexible.
Ethylene Vinyl Acetate (EVA) copolymers contain approximately 28% VA and exhibit a melting temperature of approximately 65 °C DSC.
In contrast, Ethylene Vinyl Acetate (EVA) copolymers contain about 18% VA and show a melting point of about 88 °C.
These two commercial examples illustrate the overall change in melting behavior with the increase of vinyl acetate.
However, the melting point does not depend solely on the percentage of VA.
Molecular weight, branching, thermal history, and test method can also affect the result.
The second basic molecular control parameter of Ethylene Vinyl Acetate (EVA) copolymers is molecular weight.
In commercial practice, the melt flow index is often used instead of the average molecular weight directly.
A low melt flow index is generally associated with higher melt viscosity and higher molecular weight.
A high melt flow index means lower melt viscosity and easier flow.
Therefore, it is not always appropriate to use the same grade of EVA in hot melt adhesive with film extrusion.
The main properties of Ethylene Vinyl Acetate (EVA) copolymers at the molecular level are:
Composed of ethylene and vinyl acetate repeat units
Showing thermoplastic character
Demonstrate polarity depending on vinyl acetate ratio
Showing crystallization behavior depending on vinyl acetate ratio
To be able to remain flexible at low temperature
To be able to achieve certain compatibility between polar and non-polar materials
Softening with heat and being able to be processed again
Showing very different melt flow behavior compared to grade
PHYSICAL AND CHEMICAL PROPERTIES OF ETHYLENE VINYL ACETATE (EVA) COPOLYMERS
The physical properties of Ethylene Vinyl Acetate (EVA) copolymers vary significantly with vinyl acetate ratio and melt flow index.
For this reason, it is not correct to give a single density, melting temperature or hardness value for all grades of Ethylene Vinyl Acetate (EVA) copolymers.
General technical specifications:
Physical form: Usually pellets or granules
Polymer type: Thermoplastic copolymer
Main monomers: Ethylene and Vinyl Acetate
CAS No: 24937-78-8
Single molecular formula: Not defined
Single molecular weight: Not defined
Vinyl acetate ratio: Varies by commercial grade
Melt flow index: Varies by commercial grade
Density: Numerous commercial grades are found at levels of approximately 0.93–0.97 g/cm³
Melting temperature: Can vary widely depending on grade
Water solubility: Insoluble
Water absorption: Generally low, but depends on grade and formulation
Flexibility: Increases overall as the VA ratio increases
Polarity: Increases as the VA ratio increases
Crystallization: Generally decreases as the VA ratio increases
Dow ELVAX™ 460 sample specifications:
Vinyl acetate: 18%
Melt flow index: 2.5 g/10 min, 190 °C / 2.16 kg
Density: 0.941 g/cm³
Melting point: About 88 °C
Dow ELVAX™ 3165 sample specifications:
Vinyl acetate: 18%
Melt flow index: 0.7 g/10 min
Density: 0.940 g/cm³
Melting point: About 89 °C
Dow ELVAX™ 3174 sample specifications:
Vinyl acetate: 18%
Melt flow index: 8 g/10 min
Density: 0.940 g/cm³
Melting point: About 86 °C
Celanese Ateva® 2842AC sample specifications:
Vinyl acetate: 28%
Melt flow index: 400 g/10 min
Density: 0.941 g/cm³
DSC melting temperature: About 65°C
Softening point: About 84 °C
These examples show how widely properties can vary within the same EVA family.
One of these values should not be used as "standard specification of Ethylene Vinyl Acetate (EVA) copolymers".
HOW DO ETHYLENE VINYL ACETATE (EVA) COPOLYMERS WORK AT THE MOLECULAR LEVEL?
The behavior of Ethylene Vinyl Acetate (EVA) copolymers is determined by the balance between ethylene and vinyl acetate repeat units.
Regions rich in Ethylene Vinyl Acetate (EVA) copolymers can form polyethylene-like crystal structures. These crystalline regions give the material mechanical strength and a certain level of rigidity.
Vinyl acetate units, on the other hand, make it difficult to pack polymer chains in an orderly manner.
The proportion of crystalline regions decreases and more amorphous sections are formed.
Increasing amorphous sections increases chain mobility.
Therefore, Ethylene Vinyl Acetate (EVA) copolymers can become more flexible, softer, and more resistant at low temperature.
Vinyl acetate groups also contain polar ester functions.
These polar groups are the EVA's:
Paper
Metal
Polar polymers
Some fillings
Resins
and adhesive components
It can increase its interaction with the
This property is important in hot melt adhesives.
Ethylene Vinyl Acetate (EVA) copolymers can be used as one of the basic polymers of hot melt adhesive.
When heated, the polymer melts and spreads over the surface.
When it cools, it solidifies again and forms adhesive bonding.
In this system, the vinyl acetate ratio of Ethylene Vinyl Acetate (EVA) copolymers affects adhesion and flexibility, while the melt flow index significantly affects the processing viscosity.
Ethylene Vinyl Acetate (EVA) copolymers with a very low melt flow index can create high viscosity in adhesive formulation.
Ethylene Vinyl Acetate (EVA) copolymers with a very high melt flow index are easy to apply, but the final mechanical strength and cohesion requirements should be evaluated separately.
Film applications, on the other hand, require high molecular weight and appropriate melt strength.
For this reason, lower melt flow indices may be common in film grades.
Ethylene Vinyl Acetate (EVA) copolymers can form cellular structure through chemical or physical foaming in foam applications.
The closed or semi-closed-cell structure reduces the density of the material and improves its shock damping ability.
This feature is particularly important in shoe midsoles and protective foams.
The main effects of Ethylene Vinyl Acetate (EVA) copolymers at the formulation level are:
Providing flexibility
Improving impact resistance
Supporting low temperature performance
Improving adhesion to fleece surfaces
Helping to reduce heat seal temperature
Improving film flexibility
Creating lightweight materials that can be foamed
Acting as a carrier polymer in hot melt adhesives
Providing flexible polymer phase in cables and compounds
IN WHICH SECTORS ARE ETHYLENE VINYL ACETATE (EVA) COPOLYMERS USED?
EVA is a family of thermoplastic copolymers with a wide range of applications.
Main areas of use:
Hot melt adhesives
Packaging adhesives
Book binding adhesives
Furniture edge banding adhesives
Hygiene product adhesives
Flexible packaging films
Heat seal film layers
Coating and lamination
Grades suitable for food packaging
Shoe soles
Shoe midsoles
Sports and protective foams
Sheet foams
Toy and hobby foams
Wire and cable compounds
Cable insulation and coating formulations
Hose and profile extrusion
Injection Molding
Solar panel encapsulation films
Agricultural films
Greenhouse films
Protective films
Polymer blends
Special compounds with fillers and additives
Dow positions Ethylene Vinyl Acetate (EVA) copolymers copolymers in a wide range of areas, including shoe soles, food packaging films, solar panel encapsulation, hot melt adhesives, and wire-cable applications.
The Ethylene Vinyl Acetate (EVA) copolymers product family also includes different EVA grades for adhesive, automotive, coating-lamination, compounding, flexible packaging, foam, molding, hose, photovoltaic and wire-cable applications.
HOT MELT ADHESIVE AND COATING APPLICATIONS OF ETHYLENE VINYL ACETATE (EVA) COPOLYMERS
Hot melt adhesives are one of the most important uses of EVA.
Ethylene Vinyl Acetate (EVA) copolymers can be used as the basic polymer or one of the main binder polymers in these systems.
The typical hot melt adhesive formulation does not consist of EVA alone.
Usually to EVA:
Tackifying resins
Candles
Antioxidants
and other contributions according to the application
is added.
Ethylene Vinyl Acetate (EVA) copolymers provide mechanical integrity and film-forming properties to the formulation.
The tackifying resin improves surface adhesion and wetting.
Wax, on the other hand, can help adjust the melt viscosity, open time, and solidification behavior.
The vinyl acetate ratio is critical in the selection of Ethylene Vinyl Acetate (EVA) copolymers.
Increasing the proportion of vinyl acetate can raise the polarity of the polymer and improve adhesion with various substrates.
However, the melting behavior and mechanical hardness also vary.
The melt flow index has a significant effect on the fluidity of the adhesive in the hot state.
Ethylene Vinyl Acetate (EVA) copolymers have a VA of about 28% and a melt flow index of 400 g/10 minutes, and are the commercial EVA example for direct hot melt coating and adhesive applications.
There are other grades of EVA from the same manufacturer that contain 28% VA but have much lower melt flow ratings of about 3–43 g/10 minutes.
Therefore, it is not enough to specify only "28% EVA" in the hot melt adhesive formulation.
The melt flow index must also be defined.
Coating and lamination can take advantage of EVA's low-temperature adhesion and interaction with polar surfaces.
Suitable EVA grades can be used to create bonds between paper, film, or different substrates.
FILM, PACKAGING, FOAM AND FOOTWEAR APPLICATIONS OF ETHYLENE VINYL ACETATE (EVA) COPOLYMERS
Ethylene Vinyl Acetate (EVA) copolymers can provide flexibility, clarity, puncture strength, and low-temperature heat sealability properties in film applications.
Ethylene Vinyl Acetate (EVA) copolymers and similar 18% VA grades are used in flexible packaging for low heat sealability initial temperature, high flexibility and good optical properties.
Since Ethylene Vinyl Acetate (EVA) copolymers are more polar than polyethylene, their adhesion behavior may be more advantageous in some multilayer film structures.
However, EVA is not truly the universal binding layer for all polymers.
In multi-layer film design, the chemical structure of the underlays and the need for special binder polymers should be evaluated separately.
The food contact suitability of the EVA grade to be used in food packaging should be verified separately from the manufacturer.
Just because an Ethylene Vinyl Acetate (EVA) copolymers product can technically be used in packaging does not automatically mean that it is suitable for all food contact applications.
The Ethylene Vinyl Acetate (EVA) copolymers family includes grades for food, consumer and industrial packaging applications.
Celanese also requires verification of food contact or other regulatory compliance information on certain Ethylene Vinyl Acetate (EVA) copolymers products from customer service.
In foam applications, Ethylene Vinyl Acetate (EVA) copolymers can provide low density, flexibility, and impact damping.
Shoe midsoles are one of the most well-known uses of Ethylene Vinyl Acetate (EVA) copolymers foam.
The polymer can be formulated with appropriate crosslinkers, foamers and other additives.
Foam density, hardness and rebound behavior:
EVA grade
VA rate
Amount of filling
Cross-linking level
Foaming conditions
determined by.
Therefore, "EVA foam" is not a single fixed material.
Very soft and light foams or harder structural foams can be prepared from the same EVA family.
IS ETHYLENE VINYL ACETATE (EVA) COPOLYMERS USED IN FOOD, COSMETICS AND PHARMACEUTICAL APPLICATIONS?
Ethylene Vinyl Acetate (EVA) copolymers are not a direct food additive.
However, suitable commercial EVA grades can be used in food contact packaging systems.
Food contact suitability must be verified on exact commercial grade.
The vinyl acetate ratio, additive package, excipients used in production, residual monomers, and end-use conditions can influence the regulatory assessment.
Therefore, it should not be concluded that an EVA product is suitable for food contact by seeing only CAS No 24937-78-8.
The relevant declaration of conformity must be obtained from the manufacturer.
In the European Union food contact legislation, CAS No 24937-78-8 is also listed for a specific polymeric additive under the name "ethylene-vinyl acetate copolymer wax". This registration does not mean that all general-purpose EVA resins are automatically permitted under the same conditions of use.
In cosmetic applications, EVA is not directly the standard cosmetic active ingredient or preservative.
However, there may be indirect use in some special polymeric film or packaging applications.
In pharmaceutical and medical applications, the general technical EVA grade should not automatically be considered appropriate.
If a medical device, pharmaceutical packaging, or drug contact application is targeted:
Biocompatibility
Impurity profile
Extractable substances
Leakable substances
Sterilization Resistance
and relevant legislation documents
It should also be evaluated.
INDUSTRIAL APPLICATIONS OF EVA
EVA is used in industry as a thermoplastic copolymer that provides flexibility, adhesion, impact resistance and ease of process.
Its main technical functions are:
Acting as a binding polymer in hot melt adhesive
Creating flexible film
Supporting low-temperature heat sealing
Creating a flexible polymer matrix in foam systems
Providing shock absorption
Providing flexible phase in wire and cable compounds
Used as a binder in coating and laminating applications
Modifying flexibility in polymer mixtures
Adjusting the mechanical properties of filled compounds
The following parameters should be evaluated together in EVA formulation:
Vinyl acetate ratio
Melt flow index
Density
Melting temperature
Softening behavior
Tensile strength
Elongation at break
Hardness
Flexibility
Optical properties
Contribution package
Antioxidant content
Sliding additive
Anti-blocking contribution
Processing method
Processing temperature
Food contact or other regulatory requirements
TDS
SDS
COA
Even if the vinyl acetate ratio of an EVA is the same, a different melt flow index can completely change the process behavior.
For this reason, at least the VA ratio and melt flow index must be specified together in the EVA purchase specification.
WHAT PROBLEMS CAN ETHYLENE VINYL ACETATE (EVA) COPOLYMERS HELP SOLVE?
Ethylene Vinyl Acetate (EVA) copolymers can help solve a variety of problems, especially in systems where flexibility, low temperature performance, adhesion and hot melt process behavior are required.
Polyethylene-based film is very rigid
The appropriate use of Ethylene Vinyl Acetate (EVA) copolymers can improve film flexibility and improve low-temperature behavior.
The film cracks easily at low temperature
The more amorphous and flexible structure of Ethylene Vinyl Acetate (EVA) copolymers can improve low-temperature cracking strength.
Adhesion temperature too high for packaging film
The appropriate grade of Ethylene Vinyl Acetate (EVA) copolymers can provide a lower heat sealable initial temperature.
Hot melt adhesive is very viscous
Suitable EVA grade with higher melt flow index can be evaluated.
The mechanical strength of hot melt adhesive is insufficient
Ethylene Vinyl Acetate (EVA) copolymers molecular weight, melt flow index, VA ratio, and tackifier resin balance should be re-evaluated.
Insufficient adhesion of the adhesive to the fleece surface
Ethylene Vinyl Acetate (EVA) copolymers with higher vinyl acetate can improve adhesion performance by increasing polarity.
Shoe foam is too hard
EVA grade, VA ratio, foam density and cross-linking system can be re-optimized.
The foam is very soft and has low mechanical strength
More appropriate Ethylene Vinyl Acetate (EVA) copolymers grade, density or cross-linking level can be used.
The movie is not clear enough
The VA ratio and crystallization behavior can be reviewed; however, the additive package and process conditions also affect the optical properties.
Ethylene Vinyl Acetate (EVA) copolymers flow very easily in extrusion
Grade with lower melt flow index can be preferred.
Ethylene Vinyl Acetate (EVA) copolymers do not flow sufficiently during processing
Grade with higher melt flow index can be evaluated.
Not every process problem should be solved by changing the VA ratio alone.
Melt flow index, process temperature, additives and equipment should be evaluated together.
THINGS TO CONSIDER WHEN USING ETHYLENE VINYL ACETATE (EVA) COPOLYMERS
In the use of Ethylene Vinyl Acetate (EVA) copolymers, the main issue is to match the product grade correctly with the application.
The following points should be evaluated during use:
The vinyl acetate ratio should be verified.
The melt flow index should be checked.
The melt flow test condition should be checked.
The density must be verified.
The melting temperature should be controlled.
Hardness and mechanical properties should be evaluated.
Optical properties should be checked if necessary.
The presence of a sliding and anti-blocking additive should be verified.
The antioxidant package should be checked.
The processing temperature should be determined according to the manufacturer's recommendations.
Long waiting times and extreme temperatures should be avoided.
Exact grade conformity should be verified in food contact application.
A special encapsulation grade must be used in photovoltaic application.
In wire-to-cable application, electrical and combustion properties must be verified separately.
Crosslinker and foamer compatibility should be tested in foam application.
TDS should be examined.
SDS should be examined.
Batch values should be checked via COA.
Ethylene Vinyl Acetate (EVA) copolymers can degrade at extremely high temperatures.
The Celanese Ateva® 1880A technical sheet recommends keeping the melt temperature below 210 °C and states that degradation can occur at higher temperatures.
This temperature is not the only universal upper process limit for all EVA grades.
The manufacturer's processing manual should be based on each product.
INITIAL FORMULATION APPROACHES FOR ETHYLENE VINYL ACETATE (EVA) COPOLYMERS
The following examples are initial approaches prepared to show how the grade selection of Ethylene Vinyl Acetate (EVA) copolymers can be evaluated during formulation development. These are not validated commercial recipes.
Actual ratios should be determined based on Ethylene Vinyl Acetate (EVA) copolymers grade, target mechanical properties, process equipment, and final application.
EXAMPLE 1: Ethylene Vinyl Acetate (EVA) copolymers HOT MELT ADHESIVE GRADE SCREENING
Purpose: To compare the effect of EVA grades with different VA ratio and melt flow index on the viscosity, open time and adhesion performance of hot melt adhesive.
Starting components:
In the recipes below, all ratios are given as % by weight over the total formulation. The vinyl acetate (VA) percentage of EVA is the internal composition of the polymer grade; it should not be confused with the percentage of EVA usage in the final recipe. Melt flow index (MFI) values are sample properties targeted in grade selection and should be verified by the TDS of the actual product selected.
FORMULATION 1 – CONTROL / EVA GRADE A (approx. 18% VA, target MFI 30 g/10 min):
EVA copolymer, Grade A: 35.00%
Hydrogenated hydrocarbon tackifier resin: 45.00%
Polyethylene/Fischer–Tropsch based wax: 19.50%
Hindered phenol-based antioxidant: 0.50%
TOTAL: 100.00%
FORMULATION 2 – EVA GRADE B (approx. 28% VA, target MFI 40 g/10 min):
EVA copolymer, Grade B: 35.00%
Hydrogenated hydrocarbon tackifier resin: 45.00%
Polyethylene/Fischer–Tropsch based wax: 19.50%
Hindered phenol-based antioxidant: 0.50%
TOTAL: 100.00%
FORMULATION 3 – EVA GRADE C (approx. 28% VA, target MFI 400 g/10 minutes):
EVA copolymer, Grade C: 35.00%
Hydrogenated hydrocarbon tackifier resin: 45.00%
Polyethylene/Fischer–Tropsch based wax: 19.50%
Hindered phenol-based antioxidant: 0.50%
TOTAL: 100.00%
Comparison note: In the three formulations, the EVA ratio and other raw materials are constant; only the EVA grade is changed. In the Grade A–B comparison, VA and MFI can change together; additional grade test is required at the same VA ratio to separate the MFI effect alone. Tackifier-wax compatibility, melt stability and target application temperature should be checked separately.
Test surface: Not included in the formulation; the same substrate and surface preparation are used in all samples.
Application approach:
Different grades of EVA are tested separately in the same total formulation.
All samples are prepared at the same processing temperature.
Melt viscosity is compared.
Application and propagation behavior are evaluated.
Open time is measured.
The solidification time is monitored.
The initial adhesion is evaluated.
The final bond strength is measured.
Temperature resistance is compared.
The most suitable VA ratio and melt flow index for the application are determined.
EXAMPLE 2: Ethylene Vinyl Acetate (EVA) copolymers FILM GRADE SCAN
Purpose: To compare the impact of different EVA grades on film flexibility, optical properties, and heat sealing behavior.
Starting components:
The following ratios are given as % by weight over the total film formulation. The amounts of lubricants, anti-blockers and antioxidants are constant in all samples. The VA percentage of EVA is the composition of the polymer itself. Trial grades should be selected with actual TDS data and MFI range suitable for film extrusion.
FORMULATION 1 – EVA FILM GRADE A (approx. 12% VA):
EVA copolymer, film Grade A: 99.65%
Silica-based anti-blocking additive: 0.15%
Oleamide-based lubricant additive: 0.10%
Hindered phenol-based antioxidant: 0.10%
TOTAL: 100.00%
FORMULATION 2 – EVA FILM GRADE B (approx. 18% VA):
EVA copolymer, film Grade B: 99.65%
Silica-based anti-blocking additive: 0.15%
Oleamide-based lubricant additive: 0.10%
Hindered phenol-based antioxidant: 0.10%
TOTAL: 100.00%
FORMULATION 3 – EVA FILM GRADE C (approx. 28% VA):
EVA copolymer, film Grade C: 99.65%
Silica-based anti-blocking additive: 0.15%
Oleamide-based lubricant additive: 0.10%
Hindered phenol-based antioxidant: 0.10%
TOTAL: 100.00%
Comparison grade: To examine the effect of the VA ratio, actual extrudable EVA grades with similar MFI and additive package should be selected. In particular, high MFI adhesive grades containing approximately 28% VA should not be used in place of film grade. Additives already present in commercial EVA should be accounted for; the final amount of additional additives specified should be verified.
Film thickness: It is not a formulation component; it is kept constant in all trials.
Extrusion conditions: Not a formulation component; adjusted comparably.
Application approach:
Different EVA grades are processed at the same target film thickness.
Extrusion stability is followed.
The film appearance is evaluated.
Turbidity and brightness are measured.
Tensile and elongation properties are compared.
Puncture and tear behavior is evaluated.
Low-temperature flexibility is examined.
The heat seal initial temperature is compared.
The most balanced film grade is determined.
ALTERNATIVES AND COMPARISON OF ETHYLENE VINYL ACETATE (EVA) COPOLYMERS
When choosing an alternative to Ethylene Vinyl Acetate (EVA) copolymers, the flexibility of the material should not be considered alone. Polarity, melting behavior, hardness, adhesion, process method and end use should be evaluated together.
ETHYLENE VINYL ACETATE (EVA) COPOLYMERS AND LDPE
LDPE is low-density polyethylene.
The ethylene portion of Ethylene Vinyl Acetate (EVA) copolymers has a hydrocarbon structure similar to LDPE, but EVA also contains vinyl acetate repeat units.
LDPE has lower polarity.
Ethylene Vinyl Acetate (EVA) copolymers, on the other hand, can exhibit higher polarity and stronger surface interaction thanks to vinyl acetate.
Ethylene Vinyl Acetate (EVA) copolymers can often be softer and provide a lower heat seal temperature.
LDPE, on the other hand, may offer higher chemical resistance and polyethylene-like properties in some applications.
The two products should not be substituted directly one-to-one.
ETHYLENE VINYL ACETATE (EVA) COPOLYMERS AND LLDPE
LLDPE is linear low-density polyethylene.
It can provide high tensile, puncture and tear performance in film applications.
Ethylene Vinyl Acetate (EVA) copolymers, on the other hand, can provide higher polarity, low-temperature flexibility, and low heat sealability.
Therefore, in flexible packaging formulations, EVA and LLDPE can be used together instead of being direct competitors of each other.
The mixing ratio should be determined based on the film mechanical properties and adhesion goals.
ETHYLENE VINYL ACETATE (EVA) COPOLYMERS AND EBA
EBA is a copolymer of Ethylene Butyl Acrylate.
Both materials are ethylene copolymers containing polar comonomers.
In EBA, butyl acrylate units are present instead of vinyl acetate.
This structural difference alters thermal stability, flexibility, adhesion, and process behavior.
EBA can be an alternative to EVA in certain cable, adhesive, and polymer modification applications.
One-to-one weight substitution should not be made.
ETHYLENE VINYL ACETATE (EVA) COPOLYMERS AND EMA
EMA is a copolymer of Ethylene Methyl Acrylate.
EMA, like EVA, is a polar ethylene copolymer.
The effects of methyl acrylate comonomer and vinyl acetate comonomer on polymer structure are not the same.
EMA can be an EVA alternative in some hot melt adhesive, film and compound applications.
Melt flow, polarity, thermal strength and adhesion should be tested separately.
ETHYLENE VINYL ACETATE (EVA) COPOLYMERS AND POE
POE stands for Polyolefin Elastomers.
POE is usually composed of ethylene with alpha-olefin comonomers and does not contain vinyl acetate.
POE can provide high flexibility and impact resistance at low temperature.
Ethylene Vinyl Acetate (EVA) copolymers, on the other hand, offer higher polarity and different adhesion properties due to vinyl acetate.
In foam, footwear and polymer modification, the two materials can be alternative or combined polymers.
However, their adhesion and foam behavior are not the same.
QUALITY CONTROL AND PURCHASING CRITERIA FOR ETHYLENE VINYL ACETATE (EVA) COPOLYMERS
When purchasing Ethylene Vinyl Acetate (EVA) copolymers, the mere expression "EVA granule" or "EVA resin" is not sufficient.
Recommended information to review before purchasing:
Full product name
Manufacturer
Commercial grade
CAS No
Vinyl acetate ratio
Melt flow index
Melt flow test temperature and load
Density
Melting temperature
Softening point
Hardness
Tensile strength
Elongation at break
Flexural modulus
Optical clarity
Turbidity
Brightness
Sliding additive asset
Presence of anti-blocking additive
Presence of antioxidants
Low gel requirement, film applications
Processing method
Recommended processing temperature
If food contact suitability is required
If photovoltaic suitability is required
If wire-cable compatibility is required
Shelf life
Storage conditions
Packaging
Batch number
Origin
TDS
SDS
COA
The vinyl acetate ratio is the first basic purchase parameter.
However, it is not enough on its own.
For example, two Ethylene Vinyl Acetate (EVA) copolymers products may also contain 18% VA; one may have a melt flow index of 0.7 g/10 minutes and the other may have a melt flow index of 30 g/10 minutes.
The behavior of these two materials in extrusion and adhesive applications will be markedly different.
It should also be specified under what temperature and load the melt flow index is measured.
Values obtained under different test conditions under ASTM D1238 should not be directly compared.
For high melt flow index adhesive grades, some manufacturers may use different test temperature and load.
For this reason, not only the numerical value but also the test condition should be written in the purchase specification.
STORAGE AND HANDLING OF ETHYLENE VINYL ACETATE (EVA) COPOLYMERS
Storage: Ethylene Vinyl Acetate (EVA) copolymers pellets should be stored in clean, dry, and sealed packaging.
Moisture: Ethylene Vinyl Acetate (EVA) copolymers are insoluble in water and generally tend to have low humidity; however, surface moisture, water entering the package, or contamination must be avoided during the process.
Temperature: Pellets should be avoided from being exposed directly to high heat sources.
Sun: Storage in direct sunlight for long periods of time should be avoided.
Contamination: Mixing with different polymer grades or dust, oil and other foreign substances must be avoided.
Packaging: Bag, big bag or bulk conveying systems are available according to the manufacturer and order quantity.
FIFO: First-in, first-out principle and batch tracking should be applied.
Process: Keeping EVA at extremely high temperature and for a long time in an extruder or hot melt tank should be avoided.
Celanese recommends keeping the melt temperature below 210 °C at certain Ateva® grades and notes that degradation may occur at higher temperatures.
During degradation, polymer color may change and volatile degradation products may form.
The degradation of EVA under heat can form degradation products containing acetic acid in association with acetate groups.
Therefore, a sharp acidic odor in an overheated EVA may be an indication of a process problem.
Proper ventilation should be ensured in the processing area.
The transport classification must be verified from the SDS of the exact commercial grade.
ETHYLENE VINYL ACETATE (EVA) COPOLYMERS SAFETY INFORMATION
Solid Ethylene Vinyl Acetate (EVA) copolymers pellets are generally considered as low hazard polymer material under normal use conditions.
However, different physical and chemical risks can arise at processing temperature.
Molten Ethylene Vinyl Acetate (EVA) copolymers can cause severe thermal burns.
Therefore, direct contact with the hot polymer must be avoided in extrusion, injection or hot melt application.
Thermal degradation can occur at extreme process temperatures.
Irritating gases or vapors may be formed as a result of degradation.
The smell of acetic acid may be associated with excessive thermal degradation.
Adequate ventilation should be used in the processing area.
Dust control should be applied if fine polymer dust is generated in Ethylene Vinyl Acetate (EVA) copolymers grinding or cutting processes.
Spilling pellets on the floor can pose a slip risk.
In the event of a fire, Ethylene Vinyl Acetate (EVA) copolymers can burn like many other organic polymers.
Combustion products may contain carbon monoxide, carbon dioxide, and other organic degradation products.
Exact fire and occupational safety conditions should be applied according to the manufacturer's SDS.
The fact that Ethylene Vinyl Acetate (EVA) copolymers have a low hazard profile as a solid polymer does not mean that the molten polymer or thermal degradation products are safe.
WHAT TO CONSIDER WHEN BUYING ETHYLENE VINYL ACETATE (EVA) COPOLYMERS?
When purchasing Ethylene Vinyl Acetate (EVA) copolymers, the end use must first be determined.
The properties of EVA required for film, adhesive, foam, footwear, photovoltaic, or cable applications differ from each other.
It is not appropriate to write only "EVA" in the purchase request.
At a minimum, the following two basic values should be specified:
Vinyl acetate ratio
Melt flow index and test condition
In addition, the following information should be clarified:
Use sector
Final Product
Production method
Vinyl acetate ratio
Melt flow index
Density
Melting temperature
Hardness
Mechanical Properties
Optical properties
Low gel requirement
Slip additive requirement
Requirement of anti-blocking contribution
Antioxidant requirement
If food contact suitability is required
If photovoltaic grade is required
If cable grade is required
If foam grade is required
Manufacturer
Origin
Packaging
Estimated order quantity
TDS
SDS
COA
If existing Ethylene Vinyl Acetate (EVA) copolymers are to be replaced, TDS information of the existing product
The price of Ethylene Vinyl Acetate (EVA) copolymers should not be compared based solely on the kilogram cost.
The melt flow indexes of products with the same VA ratio can be very different.
Products in the same melt flow index may have different VA ratios.
Additive packages can also change production behavior.
For this reason, the alternative product should be approved after technical data comparison and, if possible, production trial.
ETHYLENE VINYL ACETATE (EVA) COPOLYMERS SUPPLY FROM ATAMAN KIMYA
Ethylene Vinyl Acetate (EVA) copolymers; It is a family of ethylene-vinyl acetate copolymers used in hot melt adhesives, flexible packaging, film, coating and lamination, footwear and foam systems, wire-cable compounds, solar panel encapsulation and different thermoplastic applications.
Companies that want to get information about the supply of Ethylene Vinyl Acetate (EVA) copolymers from Ataman Kimya can request information about product options with appropriate vinyl acetate ratio and melt flow index, current supply conditions, packaging options and price offers by sharing their usage areas and target technical specifications.
The current stock status, manufacturer, origin, vinyl acetate ratio, melt flow index, additive package, density, packaging and application-specific regulatory compliance of the product should be confirmed from Ataman Kimya before ordering.
Sharing the following information in the request for quotation facilitates the evaluation of the appropriate EVA grade:
Use sector
Final Product
Processing method
Target vinyl acetate ratio
Target melt flow index
Melt flow test condition
Density requirement
Melting temperature requirement
Optical requirements in film application
Target melt viscosity in adhesive application
Hardness and density target in foam application
Food contact requirement
Photovoltaic application requirement
Cable application requirement
Estimated order quantity
Requested packing
Requested technical documents
TDS or COA information of the current EVA grade, if any
FREQUENTLY ASKED QUESTIONS ABOUT ETHYLENE VINYL ACETATE (EVA) COPOLYMERS
What is Ethylene Vinyl Acetate (EVA) copolymers?
EVA is a family of thermoplastic copolymers composed of ethylene and vinyl acetate monomers.
What does EVA stand for?
Ethylene Vinyl Acetate.
What is the Turkish name of Ethylene Vinyl Acetate (EVA) copolymers?
It is a copolymer of ethylene vinyl acetate.
What is the CAS number of Ethylene Vinyl Acetate (EVA) copolymers?
The commonly used CAS No is 24937-78-8.
What is the molecular formula of Ethylene Vinyl Acetate (EVA) copolymers?
Because Ethylene Vinyl Acetate (EVA) copolymers is a polymer and the ethylene/vinyl acetate ratio can vary, there is no single definitive molecular formula.
What is the molecular weight of Ethylene Vinyl Acetate (EVA) copolymers?
There is no single exact molecular weight. The molecular weight distribution varies according to the commercial grade.
Is Ethylene Vinyl Acetate (EVA) copolymers rubber?
Standard Ethylene Vinyl Acetate (EVA) copolymers are thermoplastic copolymers. Grades with high vinyl acetate content may show more elastomeric behavior.
Are Ethylene Vinyl Acetate (EVA) copolymers granules?
Many commercial thermoplastic Ethylene Vinyl Acetate (EVA) copolymers products are sold in pellets or granules.
What is the vinyl acetate ratio of Ethylene Vinyl Acetate (EVA) copolymers?
There is no single rate. It varies according to the commercial grade.
What does VA stand for in Ethylene Vinyl Acetate (EVA) copolymers?
Vinyl Acetate refers to the amount of Vinyl Acetate.
What happens to EVA as the proportion of vinyl acetate increases?
Overall, flexibility and polarity may increase, while crystallization, hardness, and melting temperature may decrease.
What is the melting point of Ethylene Vinyl Acetate (EVA) copolymers?
There is no single value. It depends on the VA ratio and grade. For example, some commercial grades containing 18% VA may show a melting temperature of about 86–89 °C, and a certain Ateva grade containing 28% VA may show a melting temperature of about 65 °C.
What is the density of Ethylene Vinyl Acetate (EVA) copolymers?
It depends on the grade. Many commercial grades can range from about 0.93–0.97 g/cm³.
What is the melt flow index of Ethylene Vinyl Acetate (EVA) copolymers?
There is no single value. It can vary very widely in commercial grades.
Why is melt flow index important?
It is one of the key parameters in evaluating how easily the polymer flows in the molten state and which processing method it is more suitable for.
What is high melt flow index EVA used for?
It can be used in some coating or molding applications where hot melt adhesive and easy flow are required.
What is low melt flow index EVA used for?
Film extrusion can be preferred in applications where hose or higher melt strength is required.
Are two EVAs of the same VA rate the same?
The melt flow index, molecular weight and additive package can be different.
Are two EVAs of the same melt flow index the same?
The VA rate and other characteristics may be different.
Are Ethylene Vinyl Acetate (EVA) copolymers used in hot melt adhesive?
Ethylene Vinyl Acetate (EVA) copolymers are one of the important basic polymers in the hot melt adhesive industry.
Are Ethylene Vinyl Acetate (EVA) copolymers used alone in hot melt adhesive?
Usually not. Formulation is created with tackifying resin, wax, antioxidant and other additives.
Do Ethylene Vinyl Acetate (EVA) copolymers provide low temperature heat sealability?
Suitable grades of Ethylene Vinyl Acetate (EVA) copolymers can provide a low heat adhesion initial temperature.
Can Ethylene Vinyl Acetate (EVA) copolymers be used in shoe soles?
In particular, foam Ethylene Vinyl Acetate (EVA) copolymers are commonly used in shoe midsoles.
What is Ethylene Vinyl Acetate (EVA) copolymers foam?
Ethylene Vinyl Acetate (EVA) is a lightweight and flexible cellular material obtained by foaming a polymer of copolymers.
Why is Ethylene Vinyl Acetate (EVA) copolymers foam lightweight?
Since gas cells are formed within the polymer, its density decreases compared to solid EVA.
Are Ethylene Vinyl Acetate (EVA) copolymers used in cable?
Suitable grades of Ethylene Vinyl Acetate (EVA) copolymers can be used in wire and cable compounds.
Are Ethylene Vinyl Acetate (EVA) copolymers used in solar panel?
Custom photovoltaic encapsulation grades can be widely used in the encapsulation of solar panel cells.
Can every Ethylene Vinyl Acetate (EVA) copolymers be used on a solar panel?
Photovoltaic applications require specialized optical, cross-linking, aging, and electrical properties.
Is Ethylene Vinyl Acetate (EVA) copolymers used in food packaging?
Certain EVA grades with the appropriate regulatory documentation can be used in food packaging.
Does CAS 24937-78-8 mean food contact compliance?
The certificate of conformity of the exact commercial grade should be checked.
Is Ethylene Vinyl Acetate (EVA) copolymers used in cosmetics?
Standard Ethylene Vinyl Acetate (EVA) copolymers resin is basically an industrial thermoplastic. Exact product and legislation for cosmetic use should be evaluated separately.
Can Ethylene Vinyl Acetate (EVA) copolymers be used in medical application?
Special and certified grades can be evaluated in certain medical or pharmaceutical applications. The general technical grade is not automatically eligible.
Is Ethylene Vinyl Acetate (EVA) copolymers the same as LDPE?
Ethylene Vinyl Acetate (EVA) copolymers contain vinyl acetate comonomer; LDPE is polyethylene.
Is Ethylene Vinyl Acetate (EVA) copolymers or LDPE more polar?
Ethylene Vinyl Acetate (EVA) copolymers are more polar due to their vinyl acetate groups.
Can Ethylene Vinyl Acetate (EVA) copolymers and LLDPE be used together?
It can be used together in suitable formulations.
Is Ethylene Vinyl Acetate (EVA) copolymers the same as POE?
POE is usually ethylene-alpha olefin copolymer and does not contain vinyl acetate.
Is Ethylene Vinyl Acetate (EVA) copolymers the same as EBA?
In EBA, the comonomer is butyl acrylate.
Is Ethylene Vinyl Acetate (EVA) copolymers the same as EMA?
In EMA, the comonomer is methyl acrylate.
Can Ethylene Vinyl Acetate (EVA) copolymers degrade during processing?
Extremely high temperature and long dwell time can lead to thermal degradation.
Why can acidic odor occur when Ethylene Vinyl Acetate (EVA) copolymers degrade?
Thermal degradation of vinyl acetate groups can contribute to the formation of degradation products containing acetic acid.
Can Ethylene Vinyl Acetate (EVA) copolymers be processed above 210°C?
For some grades, manufacturers recommend a melt temperature below 210 °C. This is not the universal limit for all EVA grades; exact TDS should be taken as basis.
Is Ethylene Vinyl Acetate (EVA) copolymers flammable?
Because it is an organic polymer, sufficient heat and ignition can burn under welding.
Are Ethylene Vinyl Acetate (EVA) copolymers pellets dangerous?
Solid pellets at normal temperature generally have a low hazard profile. The molten polymer poses a risk of thermal burn, and excessive heating can create degradation vapors.
What are the two most important values when buying Ethylene Vinyl Acetate (EVA) copolymers?
Vinyl acetate ratio with melt flow index and melt flow is the test condition.
What documents should be required for Ethylene Vinyl Acetate (EVA) copolymers?
TDS, SDS, and COA are essential documents. Relevant certificates of conformity should also be required for food contact, photovoltaic, cable, or other specialized applications.
How should Ethylene Vinyl Acetate (EVA) copolymers be stored?
It should be stored in dry, clean, sealed packaging, protected from direct sun and extreme heat.
ETHYLENE VINYL ACETATE (EVA) COPOLYMERS – TECHNICAL SUMMARY
Ethylene Vinyl Acetate (EVA) copolymers, commonly abbreviated as EVA, are a family of thermoplastic polymers obtained by the copolymerization of ethylene and vinyl acetate.
Its Turkish name is Ethylene Vinyl Acetate Copolymer. Common CAS No is 24937-78-8.
Ethylene Vinyl Acetate (EVA) copolymers are not a single pure molecule and are composed of polymer chains with different vinyl acetate ratios and molecular weight distributions.
For this reason, no single exact molecular formula or single molecular weight is given for Ethylene Vinyl Acetate (EVA) copolymers.
The two basic repeat units of the polymer are ethylene and vinyl acetate.
The amount of vinyl acetate is one of the key parameters in determining the physical properties of EVA.
As the VA ratio rises, EVA becomes more flexible, softer, and more polar overall.
Crystallization and melting temperature usually decreases.
This change can improve the adhesion and low-temperature performance of Ethylene Vinyl Acetate (EVA) copolymers to polar substrates.
The second key commercial parameter of Ethylene Vinyl Acetate (EVA) copolymers is the melt flow index.
The melt flow index significantly influences the flow behavior of the polymer during processing.
EVA products with the same VA ratio can have very different melt flow indices.
Dow's EVA grades containing 18% VA have different melt flow values, such as approximately 0.7, 2.5, 8, and 30 g/10 minutes.
Therefore, it cannot be said that the two EVA products are equivalent just by looking at the vinyl acetate ratio.
The Ethylene Vinyl Acetate (EVA) copolymers product family includes commercial grades containing approximately 9% to 40% VA.
Melt flow indices can also range from very low values to hundreds of g/10 minutes.
This wide product range means that EVA can be customized for different applications, such as film, foam, adhesive, cable, coating, molding, and photovoltaics.
The main uses of Ethylene Vinyl Acetate (EVA) copolymers are hot melt adhesives, flexible packaging films, low-temperature heat-sealing layers, footwear and other foam products, wire-cable systems, coating-lamination, hose, molding and solar panel encapsulation films.
EVA grades with high melt flow and suitable VA content can be used in hot melt adhesive.
Film extrusion, on the other hand, may require grades with lower melt flow and sufficient melt strength.
Foam applications utilize EVA's flexibility and shock absorption properties.
Only EVA grades with regulatory documents suitable for the application should be used in food packaging.
The presence of CAS No 24937-78-8 alone does not indicate food contact suitability.
Ethylene Vinyl Acetate (EVA) copolymers should not be exposed to extreme temperature during processing.
Celanese recommends keeping the melt temperature below 210 °C for certain grades of Ethylene Vinyl Acetate (EVA) copolymers; thermal degradation may occur at higher temperatures.
This value should not be applied as a universal limit to all Ethylene Vinyl Acetate (EVA) copolymers products and the exact manufacturer's TDS should be used.
When purchasing Ethylene Vinyl Acetate (EVA) copolymers, vinyl acetate ratio, melt flow index and test condition, density, melting temperature, mechanical properties, additive package and conformity documents for the final application should be evaluated together.
Companies planning to supply Ethylene Vinyl Acetate (EVA) copolymers from Ataman Kimya are recommended to confirm the current product and offer conditions by sharing the usage area, target VA ratio, melt flow index, processing method, application-specific mechanical or optical properties, necessary regulatory documents, quantity and packaging needs.
