HSR HIGH STYRENE RUBBER

HSR High Styrene Rubber is coagulated with use of synthetic coagulant and is stabilized by a non-staining antioxidant.
HSR High Styrene Rubber is a synthetic rubber containing a high proportion of styrene in a styrene–butadiene copolymer, designed to provide increased hardness, rigidity, abrasion resistance, and dimensional stability compared with conventional styrene-butadiene rubber (SBR).
HSR High Styrene Rubber is widely used in rubber goods, adhesives, flooring, footwear, and polymer modification.

CAS Number: 9003-55-8
Molecular Formula: (C8H8.C4H6)x
Molecular Weight: 158.24
EINECS Number: 618-370-2

Synonyms: solprene300, solprene303, styrene-butadienecopolymers, Styrene-butadienerubber1500, styrenepolymerwith1,3-butadiene, synpol1500, thermoplastic125, tr201

HSR High Styrene Rubbers consumption for all applications is four times that of polybutadiene, its nearest competitor, and 1.5 times that of all other elastomers combined. 
HSR High Styrene Rubbers manufacture involves copolymerization of three parts butadiene with one part styrene. 
These materials are suspended in finely divided emulsion form in a large proportion of water, in the presence of a soap or detergent. 

Also present in small amounts are an initiator or catalyst which is usually a peroxide, and a chain-modifying agent such as dodecyl mercaptan.
HSR High Styrene Rubber is standard grade of high-styrene rubber. 
HSR High Styrene Rubber is produced by mixing styrene-butadiene latex and high styrene resin in appropriate proportion. 

HSR High Styrene Rubber makes it an important engineering elastomer.
HSR High Styrene Rubber is a random copolymer of styrene (C₈H₈) and butadiene (C₄H₆), typically containing about 70–85% styrene and 15–30% butadiene, although the exact composition varies by grade.
The high styrene content gives the material greater hardness and strength, while the butadiene phase provides limited elasticity.

HSR High Styrene Rubber makes it important in copolymer materials science.
Unlike conventional SBR, which behaves primarily as an elastomer, HSR exhibits properties intermediate between rubber and thermoplastic materials, offering higher modulus and improved wear resistance while retaining some flexibility.
This balance allows it to reinforce softer rubber compounds.

HSR High Styrene Rubber makes it important in rubber compounding technology.
HSR High Styrene Rubber is best described as a high-styrene synthetic copolymer used to improve hardness, abrasion resistance, and mechanical strength in rubber formulations, adhesives, and industrial products.
Its primary function is reinforcement and property modification rather than high elasticity.

HSR High Styrene Rubber makes it widely used in industrial polymer engineering.
HSR High Styrene Rubber exhibits a microphase morphology in which styrene-rich domains act as reinforcing regions dispersed within the continuous butadiene-rich phase, producing a balance between rigidity and limited elasticity.
This phase-separated structure largely determines its mechanical performance.

HSR High Styrene Rubber makes it important in polymer morphology engineering.
The material demonstrates excellent filler compatibility with reinforcing agents such as carbon black and silica, allowing significant improvements in tensile strength, abrasion resistance, and hardness after compounding.
The final properties depend strongly on the type and amount of filler used.

HSR High Styrene Rubber makes it important in rubber reinforcement technology.
HSR High Styrene Rubber possesses good resistance to deformation under compressive loads because the high styrene content increases the elastic modulus and reduces permanent set during repeated mechanical loading.
This improves dimensional stability in industrial rubber products.

HSR High Styrene Rubber makes it important in compression-resistant applications.
The butadiene segments contain carbon–carbon double bonds that remain susceptible to oxidation, ozone attack, and ultraviolet degradation if left unprotected, so antioxidants and antiozonants are commonly incorporated into commercial formulations.
These stabilizers greatly improve outdoor durability.

This makes it important in weather-resistant rubber design.
HSR High Styrene Rubber can be vulcanized using sulfur or peroxide curing systems, forming a three-dimensional crosslinked network that enhances tensile strength, heat resistance, and elastic recovery.
The choice of curing system influences hardness, aging resistance, and dynamic mechanical properties.

HSR High Styrene Rubber makes it important in rubber vulcanization technology.
Its dynamic mechanical properties provide high energy absorption and vibration damping while maintaining greater stiffness than conventional elastomers, making it suitable for applications requiring both structural support and shock absorption.

HSR High Styrene Rubber balance broadens its industrial applications.
This makes it important in mechanical performance engineering.

Melting point: 253 °C
Density: 1.04 g/mL at 25 °C
refractive index: 1.57
solubility: Soluble in solvents with solubility parameters between 7.7 and 9.4
form: slab/chunk
Viscosity: 1.0 (intrinsic viscosity)
Viscosity: 4,000 cP (25 wt% in toluene at 25 °C, Brookfield viscosity)
Stability: Stable. Combustible. Incompatible with strong oxidizing agents.
Cosmetics Ingredients Functions: OPACIFYING
InChI: InChI=1S/C8H8.C4H6/c1-2-8-6-4-3-5-7-8;1-3-4-2/h2-7H,1H2;3-4H,1-2H2
InChIKey: MTAZNLWOLGHBHU-UHFFFAOYSA-N
SMILES: C(=C)C=C.C(C1C=CC=CC=1)=C
LogP: 2.700 (est)

HSR High Styrene Rubber is prepared mainly by emulsion and solution polymerization in a free-radical process with a mercaptan, such as dodecylmercaptan, which is used as a chain-transfer agent to control molecular weight. 
In the emulsion process, a soapstabilized water emulsion of styrene and butadiene is polymerized in continuous reactors to form SBR elastomer. 
HSR High Styrene Rubber is produced at a temperature of 5–10°C, and “hot” SBR at about 50°C . 

HSR High Styrene Rubber is typically made in hydrocarbon solution with an n-butyllithium initiator. 
The major differences between emulsion and solution styrene–butadiene are in the linearity and molecular-weight distribution of the polymer chains. 
In nonpolar solvents, the tendency is to produce block copolymer, but random copolymers are formed in polar solvents. 

HSR High Styrene Rubber can be vulcanized similar to natural rubber but generally requires less sulfur and is more accelerated because of its lowunsaturation.
HSR High Styrene Rubber remains a low-hazard polymer with very low inherent toxicity because of its high molecular weight and low bioavailability.
It is not considered hazardous under normal industrial handling conditions.

This makes it safe for routine manufacturing applications.
The primary occupational hazard is exposure to airborne dust generated during grinding, cutting, or handling of powdered grades, which may temporarily irritate the eyes, skin, and respiratory tract.
Appropriate ventilation and dust collection systems minimize exposure.

HSR High Styrene Rubber makes engineering controls important.
During processing at excessive temperatures, thermal decomposition may generate hydrocarbons, aldehydes, carbon monoxide, and other irritating combustion products typical of styrene–butadiene polymers.
Processing temperatures should therefore remain within recommended limits.

HSR High Styrene Rubber makes thermal process control important.
Because the polymer contains unsaturated butadiene segments, prolonged exposure to oxygen, ozone, heat, and sunlight may gradually reduce mechanical performance if stabilizers are absent or depleted.
Proper formulation and storage significantly improve aging resistance.

HSR High Styrene Rubber makes material stabilization important.
From an environmental perspective, HSR is not readily biodegradable and can persist in the environment like most synthetic rubbers, although it is generally considered chemically inert and has low mobility due to its high molecular weight.
Responsible disposal and recycling are therefore encouraged.

HSR High Styrene Rubber makes environmental management important.
HSR High Styrene Rubbers are produced from styrene and butadiene using emulsion copolymerization. 
HSR High Styrene Rubber is then coagulated with aluminium sulphate and stabilized with a non-staining antioxidant. 

HSR High Styrene Rubber is supplied as pellets and KER® 9000 as a powdered form. 
HSR High Styrene Rubber is a standard grade of high styrene rubber. 
It is produced by mixing butadiene-styrene latex with high styrene resin, coagulated using a synthetic coagulant and stabilized with a non-staining antioxidant.

HSR High Styrene Rubber develops its mechanical properties through the combination of rigid styrene domains and flexible butadiene segments, creating a material with higher stiffness and improved resistance to deformation than ordinary SBR.
The styrene-rich regions act as reinforcing phases within the polymer matrix.
This makes it important in polymer morphology.

Increasing the styrene content raises tensile modulus, hardness, and abrasion resistance but generally reduces elongation at break and elasticity.
This trade-off allows manufacturers to tailor materials for applications requiring greater structural stability.
HSR High Styrene Rubber makes it important in property optimization.

HSR High Styrene Rubber exhibits good compatibility with natural rubber (NR), styrene-butadiene rubber (SBR), nitrile rubber (NBR), and other synthetic elastomers, allowing it to be blended to modify performance characteristics.
HSR High Styrene Rubber flexibility makes it valuable in industrial compounding.
This makes it important in rubber blend technology.

The material also demonstrates good resistance to mechanical wear and compression under repeated loading, making it suitable for products exposed to friction and continuous use.
However, its weathering resistance depends on formulation and the presence of stabilizers.
HSR High Styrene Rubber makes it important in durable rubber applications.

HSR High Styrene Rubber generally exhibits improved dimensional stability and lower creep than standard SBR, helping finished products maintain their shape under load.
This is beneficial in structural rubber components.
HSR High Styrene Rubber makes it important in engineering applications.

Uses Of HSR High Styrene Rubber:
Component of hot melt adhesives, sealants, asphalt and oil gels. 
Modifier for polymers, thermosets and general rubber compounding. 
Direct molded or extruded auto parts, sporting goods, footware and film.

HSR High Styrene Rubber is widely used in shoe soles, heels, and footwear components where high abrasion resistance, hardness, and durability are required.
It improves wear life while maintaining sufficient flexibility for comfort.
HSR High Styrene Rubber makes it essential in footwear manufacturing.

It is used in rubber flooring, floor tiles, and industrial mats to improve surface hardness, resistance to wear, and dimensional stability under heavy traffic.
These properties extend product service life.
HSR High Styrene Rubber makes it important in flooring applications.

In pressure-sensitive adhesives, hot-melt adhesives, and contact adhesives, HSR contributes strength, tack balance, and mechanical stability to the adhesive matrix.
HSR High Styrene Rubber improves bonding performance in demanding applications.
This makes it important in adhesive technology.

HSR High Styrene Rubber is used as a reinforcing component in rubber compounds for belts, hoses, seals, and molded industrial products, where increased stiffness and wear resistance are desired.
This enhances durability without excessively sacrificing processability.
HSR High Styrene Rubber makes it important in industrial rubber manufacturing.

HSR High Styrene Rubber is also incorporated into plastic modification formulations to improve impact resistance, rigidity, and toughness of polymer blends used in consumer and industrial products.
Its compatibility with other polymers allows tailored material performance.
HSR High Styrene Rubber makes it important in polymer modification.

HSR High Styrene Rubber is widely used in industrial conveyor belts and power transmission belts, where high abrasion resistance, dimensional stability, and mechanical strength are required under continuous operation.
Its reinforcement properties improve service life under repeated loading.
HSR High Styrene Rubber makes it important in industrial machinery.

HSR High Styrene Rubber is used in automotive rubber components such as bushings, vibration-damping parts, and protective covers that require increased stiffness and wear resistance.
These properties contribute to improved durability and mechanical performance.
HSR High Styrene Rubber makes it important in automotive engineering.

In rubber rollers for printing, textile, and paper-processing equipment, HSR provides hardness, surface durability, and resistance to mechanical wear during continuous rotation.
HSR High Styrene Rubber ensures consistent performance over long production cycles.
This makes it important in industrial manufacturing equipment.

It is incorporated into shoe soles, industrial footwear, and safety boots to improve abrasion resistance, impact durability, and structural rigidity while maintaining moderate flexibility.
This extends product lifetime under demanding conditions.
HSR High Styrene Rubber makes it important in footwear engineering.

HSR High Styrene Rubber is also used in modified asphalt and bituminous products, where it enhances stiffness, rutting resistance, and mechanical stability of road paving materials under heavy traffic loads.
This improves pavement performance and service life.
HSR High Styrene Rubber makes it important in pavement engineering.

HSR High Styrene Rubber is widely used in shoe soles, heels, and safety footwear, where its high hardness, abrasion resistance, and durability improve wear life while maintaining moderate flexibility.
This provides long-lasting performance under repeated mechanical stress.
HSR High Styrene Rubber makes it essential in footwear manufacturing.

HSR High Styrene Rubber is used in industrial conveyor belts, transmission belts, and rubber rollers, where increased stiffness, wear resistance, and dimensional stability are required for continuous operation.
These properties improve service life and reduce maintenance.
HSR High Styrene Rubber makes it important in industrial machinery.

In automotive rubber components such as bushings, seals, vibration-damping parts, and protective covers, it enhances mechanical strength, impact resistance, and resistance to deformation under load.
This contributes to improved durability and performance.
HSR High Styrene Rubber makes it important in automotive engineering.

It is used as a reinforcing polymer in rubber compounds for hoses, gaskets, molded products, and industrial seals, where higher hardness and abrasion resistance are needed than conventional SBR can provide.
This improves mechanical performance without significantly reducing processability.
HSR High Styrene Rubber makes it important in rubber compounding.

In pressure-sensitive adhesives, hot-melt adhesives, and contact adhesives, HSR improves cohesive strength, tack balance, and mechanical stability of the adhesive layer.
This results in stronger and more durable bonding performance.
HSR High Styrene Rubber makes it important in adhesive technology.

HSR High Styrene Rubber is incorporated into plastic modification formulations to increase impact resistance, stiffness, and toughness of polymer blends used in consumer goods and engineering plastics.
Its compatibility with other polymers allows tailored material properties.
This makes it important in polymer modification.

HSR High Styrene Rubber is also used in modified asphalt and bitumen for road paving and waterproofing membranes, where it improves resistance to rutting, cracking, and deformation caused by heavy traffic and temperature changes.
This enhances pavement durability and service life.
HSR High Styrene Rubber makes it important in civil engineering materials.

Safety Profile Of HSR High Styrene Rubber:
When heated to decomposition it emits acrid smoke and irritating fumes.
HSR High Styrene Rubber is prepared in large quantities for tire treads and other, similar uses. 
The properties, molecular weight, and percentage of monomer can all be controlled in the polymerization process. 

Hazards of the HSR High Styrene Rubber industry have been identified and related mostly to the monomers and additives.
HSR High Styrene Rubber is generally considered a low-hazard solid polymer with very low acute toxicity under normal handling conditions.
In its finished form, it is chemically stable and largely inert.

HSR High Styrene Rubber makes it relatively safe for industrial use.
During handling of powdered or finely divided grades, dust may cause mild irritation to the eyes, skin, or respiratory tract, particularly with prolonged exposure.
Dust control and appropriate ventilation are recommended.

HSR High Styrene Rubber makes workplace hygiene important.
During high-temperature processing or thermal decomposition, HSR may release irritating organic vapors, carbon monoxide, carbon dioxide, and other decomposition products typical of hydrocarbon polymers.
Proper ventilation is necessary during processing.

This makes thermal safety important.
HSR High Styrene Rubber is combustible and will burn if exposed to sufficient heat or open flame, producing dense smoke and combustion gases.
Suitable fire prevention and storage practices should therefore be followed.

This makes fire safety important.
HSR High Styrene Rubber is a stable, low-toxicity engineering polymer whose primary hazards are associated with dust generation, thermal processing, and combustion rather than intrinsic chemical toxicity.

Standard industrial hygiene and processing precautions are generally sufficient for safe handling.
HSR High Styrene Rubber makes it a low-risk but process-sensitive synthetic rubber.