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CHEMOSIL NL 411 elastomer bonding agent is a versatile bonding agent suitable for use as a covercoat material over CHEMOSIL 211 primer, or as a one-coat bonding agent for bonding a variety of elastomer compounds to metal and plastic substrates during the vulcanization process.
CHEMOSIL NL 411 is formulated without heavy metals and composed of a mixture of dispersed polymers, cross-linking agent and suspended solids in an organic solvent system.
CHEMOSIL NL 411 bonding agent will bond elastomer compounds based on natural rubber (NR), polyisoprene (IR), styrene-butadiene (SBR), polybutadiene (BR), polychloroprene (CR), butyl (IIR), ethylene propylene (EPDM) and chlorinesulfonic polyethylene (CSM) to most metals, alloys and rigid plastic substrates.
CHEMOSIL NL 411 is a non-lead added version of CHEMOSIL 411.
As such CHEMOSIL NL 411 is a versatile, heat activated bonding agent which will bond a variety of rubber compounds to metal and plastic substrates.
CHEMOSIL NL 411 can be used as a single coat, but in combination with appropriate metal primers (e.g., CHEMOSIL 211), the inservice environmental resistance of the fi nal bond can be very much improved.
CHEMOSIL NL 411 bonds elastomer compounds based on natural rubber (NR), butadiene (BR), isoprene (IR), styrene-butadiene (SBR), nitrile (NBR) and chloroprene (CR), ethylene-propylene (EPDM) and butyl (IIR) rubber to most metals, alloys and rigid plastic substrates.
The bond is established during the vulcanization process of the rubber under cure temperatures between 130-180°C.
The bond exhibits good resistance against heat, oil and aggressive media.
CHEMOSIL 411 is a universal bonding agent suitable for use as a cover coat material over CHEMOSIL 211 primer.
In some circumstances, CHEMOSIL 411 may be used as a single coat.
During vulcanization, this bonding agent will bond elastomer compounds based on: NR-, IR-, BR-, SBR-, NBR-, CR- and IIR-, EPDM-, CSM and similar elastomers to metals, alloys as well as to a number of other solids.
Applications of CHEMOSIL NL 411:
Surface Preparation:
Thoroughly clean metal surfaces prior to adhesive application.
Remove protective oils, cutting oils and greases by solvent degreasing or alkaline cleaning.
Remove rust, scale or oxide coatings by suitable chemical or mechanical cleaning methods.
Chemical Cleaning:
Chemical treatments are readily adapted to automated metal treatment and adhesive application lines.
Chemical treatments are also used on metal parts that would be distorted by blast cleaning or where tight tolerances must be maintained.
Phosphatizing is a commonly used chemical treatment for steel, while conversion coatings are commonly used for aluminum.
Mechanical Cleaning:
Grit blasting is the most widely used method of mechanical cleaning.
However machining, grinding or wire brushing can be used.
Use steel grit to blast clean steel, cast iron and other ferrous metals.
Use aluminum oxide, sand or other nonferrous grit to blast clean stainless steel, aluminum, brass, zinc and other nonferrous metals.
Features and Benefits of CHEMOSIL NL 411:
Versatile – bonds a wide variety of elastomer compounds to rigid substrates during vulcanization.
When used in combination with CHEMOSIL 211 primer, bonds soft NR and NBR compounds in transfer molding and injection molding production.
Easy to Apply – applies easily by spray, dip, brush or roll coat methods.
Environmentally Resistant – provides excellent resistance to heat, oil and solvents.
Improved corrosion resistance when used in combination with CHEMOSIL 211 primer.
Processing of CHEMOSIL NL 411:
A properly prepared substrate surface is essential to achieve consistent elastomer bond performance.
All oil, grease and other soluble contamination should be removed by solvent degreasing or alkaline cleaning.
Rust, scale and other non-soluble contaminants should be removed by mechanical or chemical methods.
Grit blasting is the most commonly used mechanical method.
A second degreasing stage after the mechanical treatment is strongly recommended to remove residual grease, oil and abraded dusts.
Chemical treatments for ferrous substrates usually involve the use of phosphatizing agents.
CHEMOSIL NL 411 contains dispersed solids and must be thoroughly stirred before and at frequent intervals during use.
CHEMOSIL NL 411 can be applied undiluted by brush or roller coating.
For spray or dip applications, CHEMOSIL NL 411 must be diluted.
For a recommended dry fi lm thickness of ~ 20 microns the following dilution is recommended:
Brushing/rolling: undiluted
Dipping: up to 10% xylene or toluene
Spraying: 30-90% xylene (4 mm cup 15-17 sec., air pressure 3-4 bar, nozzle Ø 1-2 mm, distance ~ 50 cm)
Technical Data of CHEMOSIL NL 411:
Dilution will accelerate settling, maintain suffi cient agitation to ensure product uniformity.
A thin uniform coating gives best results.
Avoid applying thick coats which can give poor drying and may lead to film displacement (sweep) during molding.
At ambient temperature, allow 30 minutes drying time after coating.
Elevated temperatures (up to 90°C) in hot air ovens or drying tunnels will reduce the drying time required.
CHEMOSIL NL 411 will dry to a hard, non-tacky film.
Coated components can be stacked or loaded into bins for transport and storage.
Clean cotton gloves should be worn when handling coated components.
Coated components can be stored for up to 3 months before bonding without adversely affecting the bond performance.
Coated components should be protected from dust, moisture and other contamination during storage.
For further detailed information on surface preparation of specific substrates, refer to Chemlok/CHEMOSIL Adhesives application guide.
Handle clean metal surfaces with clean gloves to avoid contamination with skin oils.
If applicable, allow primer to thoroughly dry before applying CHEMOSIL NL 411 bonding agent.
For further details on the use of CHEMOSIL 211 primer, refer to the applicable data sheet.
Mixing – Thoroughly stir CHEMOSIL NL 411 bonding
agent before use, and agitate sufficiently during use to
keep dispersed solids uniformly suspended.
Applying – Apply bonding agent by brush, roll coat,
dip or spray methods.
Brushing/Roll Coating
Apply full strength.
Dipping:
Dilute bonding agent with up to 10% of xylene or
toluene.
Spraying:
Dilute bonding agent to a viscosity of 15-17 seconds using 30-90% xylene.
Avoid applying thick coats which result in poor drying and may lead to film displacement during molding.
Regardless of application method, recommended dry film thickness of CHEMOSIL NL 411 bonding agent is 15-20 micron (0.6-0.8 mil).
Drying/Curing – Allow applied bonding agent to air-dry for at least 30 minutes at room temperature.
Drying time can be shortened by using hot air drying ovens or tunnels up to 90°C (194°F).
Dried films of CHEMOSIL NL 411 bonding agent are non-tacky.
Therefore, coated parts can be stacked and stored in a dry, grease-free environment for extended periods without affecting bond performance.
Bonding occurs during vulcanization process of the rubber under recommended cure temperatures of 130-180°C (266-356°F).
Cleanup – Use xylene or toluene for clean up.
Delivery Form of CHEMOSIL NL 411:
Containers 10 kg, 25 kg or 190 kg
Shelf Life/Storage of CHEMOSIL NL 411:
Shelf life is one year from date of manufacture when stored below 25°C (77°F) in original, unopened container.
Cautionary Information of CHEMOSIL NL 411:
Before using this or any LORD product, refer to the Safety Data Sheet (SDS) and label for safe use and handling instructions.
For industrial/commercial use only.
Must be applied by trained personnel only.
Not to be used in household applications.
Not for consumer use.
Typical Properties of CHEMOSIL NL 411:
Appearance: Black Liquid
Viscosity, cps 25°C (77°F): 200-600
Density 20°C (68°F)
g/cm3: 0.97-1.01
(lb/gal): (8.10-8.43)
Solids Content by Weight, % : 22-26
Flash Point, °C (°F): 23 (73)
Solvents: Xylene
Specifications of CHEMOSIL NL 411:
Solids content: 22.0 - 26.0 weight %
Viscosity at manufacturing: 200 - 600 mPas
Density: 0.97 - 1.01 g/ml
Composition of CHEMOSIL NL 411:
Polymers and heat reactive components in an organic
solvent system.
