Synthetic Rubber: Material and Examples

Synthetic rubber is a manufactured elastomer produced through the chemical polymerization of petroleum-derived monomers, engineered to replicate and exceed the mechanical properties of natural rubber. Synthetic rubber originates from petrochemical feedstocks processed into reactive monomers, including styrene, butadiene, isoprene, chloroprene, and acrylonitrile, which form long-chain elastomeric polymers. 

Synthetic rubber is produced through emulsion, solution, or gas-phase, followed by compounding and vulcanization. Primary types include Styrene-Butadiene Rubber (SBR), Neoprene, Nitrile Rubber (NBR), Butyl Rubber (IIR), EPDM, Silicone Rubber, and Thermoplastic Rubber (TPR), each engineered for specific performance requirements. Examples span tires, seals, gaskets, hoses, gloves, and industrial conveyor systems across automotive, aerospace, medical, and construction industries.

What Is Synthetic Rubber?

Synthetic rubber is an artificially manufactured elastomer produced through the chemical polymerization of petroleum-derived monomers, designed to replicate the elastic and resilient properties of natural rubber while offering enhanced resistance to heat, chemicals, UV radiation, and mechanical stress. The material returns to its original shape after deformation, with elongation at break values ranging from 100% to over 800% depending on polymer type. Synthetic rubber accounts for approximately 60% to 65% of total global rubber consumption, with production reaching approximately 15 million metric tons annually. The material is formulated from monomers, including butadiene, styrene, isoprene, chloroprene, and ethylene, bonded into polymer chains through controlled industrial processes. Products range from automotive tires and industrial seals to medical gloves and construction membranes, with hardness measurable on the Shore A scale from 20 to 90.

How Is Synthetic Rubber Defined in Simple Terms?

Synthetic rubber is a man-made elastic material produced from petroleum-derived chemicals, engineered to stretch, compress, and return to its original shape under repeated mechanical stress. The term "synthetic" indicates the material does not originate from the rubber tree (Hevea brasiliensis) but from industrial chemical processes that construct its polymer structure entirely from petrochemical inputs. Synthetic rubber performs like natural rubber but is manufactured with greater consistency and adjusted chemically to operate in conditions natural rubber cannot tolerate, including temperatures below -50°C or above 200°C, prolonged oil immersion, and continuous UV exposure. Hardness is measured on the Shore A durometer scale from 20 (very soft) to 90 (hard rubber), allowing precise flexibility specification for any application from surgical gloves to industrial conveyor belts.

Is Synthetic Rubber Considered a Synthetic Polymer?

Synthetic rubber is considered a synthetic polymer. Its molecular structure consists of long-chain repeating monomer units chemically bonded through polymerization reactions conducted entirely through industrial processes. Every commercially produced synthetic rubber type, including SBR, NBR, and EPDM, qualifies as a synthetic polymer under standard polymer chemistry definitions. Polymer chains in synthetic rubber are constructed from petroleum-derived monomers with molecular weights per repeat unit ranging from 54 g/mol (butadiene) to 88.5 g/mol (chloroprene). The resulting polymer reaches a molecular weight of 100,000 to over 1,000,000 g/mol, producing the elastic, high-elongation properties characteristic of rubber. Crosslinking during vulcanization creates a three-dimensional network that defines the final mechanical performance. Comprehensive material classifications are covered under synthetic polymers.

Where Does Synthetic Rubber Come From?

Synthetic rubber originates from the petrochemical industry, where crude oil and natural gas are refined and cracked into reactive monomers that serve as building blocks for elastomeric polymer synthesis. Commercial production began in Germany during World War I and expanded significantly during World War II with mass production of GR-S (Government Rubber-Styrene), the precursor to modern SBR. Major production centers are located in China, the United States, Russia, Japan, and Germany, with China holding the largest global output share. The primary feedstock, naphtha, is produced during crude oil distillation at 30°C to 200°C and further processed through steam cracking at 750°C to 900°C to yield butadiene, ethylene, propylene, and benzene for rubber polymerization.

What Are the Main Sources of Synthetic Rubber?

The main sources of synthetic rubber are listed below.

• Crude Oil (Naphtha Fraction): Naphtha steam-cracked at 750°C to 900°C yields butadiene, styrene, isoprene, and ethylene, as well as benzene, used to synthesize styrene, the primary monomers for SBR, polybutadiene, polyisoprene, and EPDM production. Naphtha-derived monomers supply the majority of global synthetic rubber feedstock.
• Natural Gas Processing: Ethane and propane fractions cracked from natural gas produce ethylene and propylene, monomers used in EPDM synthesis
• Coal Tar (Historical Source): Coal tar distillation historically yielded benzene and toluene for early synthetic rubber production. Petroleum sources have since replaced coal-derived feedstocks in commercial manufacturing.
• Bio-based Feedstocks (Emerging Source): Fermentation of sugarcane or corn starch generates bio-based butadiene and isoprene for bio-SBR and bio-polyisoprene production. Bio-based synthetic rubber currently represents less than 5% of total global output but is growing as sustainability targets increase across automotive sectors.
• Acetylene (Historical Source): Acetylene-based routes were used in early chloroprene production but have been replaced by butadiene-based processes in modern neoprene manufacturing.

Does Synthetic Rubber Come From Petroleum Based Materials?

Synthetic rubber comes predominantly from petroleum-based materials. Crude oil and natural gas supply the chemical monomers polymerized into synthetic rubber at an industrial scale, with approximately 95% or more of global production relying on petroleum-derived monomers, including butadiene, styrene, isoprene, ethylene, propylene, and acrylonitrile. Crude oil is refined through fractional distillation to yield naphtha, which is steam-cracked to produce the reactive monomers entering rubber polymerization reactors. The price of synthetic rubber is consequently sensitive to crude oil fluctuations: a 10% increase in crude oil prices typically translates to a 5% to 8% increase in synthetic rubber raw material costs within 30 to 90 days. Petroleum's role as the dominant feedstock represents a supply scale advantage and a vulnerability during oil price volatility.

What Is Synthetic Rubber Made Of?

Synthetic rubber is made of polymerized chemical monomers derived from petroleum refining, formulated with vulcanizing agents, fillers, plasticizers, and antioxidants to produce the final compounded elastomer. The specific monomer composition determines polymer type and performance, while compounding additives govern processing behavior and end-use properties. Core monomers include butadiene (C₄H₆), styrene (C₈H₈), isoprene (C₅H₈), chloroprene (C₄H₅Cl), acrylonitrile (C₃H₃N), ethylene (C₂H₄), and propylene (C₃H₆). Butadiene is the most widely consumed monomer, accounting for approximately 60% to 70% of total monomer usage across rubber types. Compounding additives include sulfur at 1% to 5% by weight (vulcanizing agent), carbon black at 20% to 50% by weight (reinforcing filler), zinc oxide at 3% to 5% by weight (vulcanization activator), processing oils at 5% to 30% by weight (plasticizer), and antioxidants at 0.5% to 2% by weight.

Which Materials Are Used in Synthetic Rubber Production?

The materials that are used in synthetic rubber production are listed below.

• Butadiene (C₄H₆): The primary monomer in SBR, polybutadiene, and NBR, produced from naphtha steam cracking. Global butadiene production exceeds 12 million metric tons annually, with approximately 65% directed to synthetic rubber manufacturing.
• Styrene (C₈H₈): A co-monomer in SBR, incorporated at 23% to 25% by weight to improve stiffness, processability, and abrasion resistance.
• Acrylonitrile (C₃H₃N): A co-monomer in NBR at 18% to 50% by weight, where higher content directly increases oil and fuel resistance.
• Chloroprene (C₄H₅Cl): The monomer for neoprene rubber, where the chlorine atom imparts flame resistance and weather resistance to the polymer chain.
• Sulfur (Vulcanizing Agent): Crosslinks polymer chains during vulcanization at 140°C to 200°C, converting uncured rubber into a thermoset elastomer.
• Carbon Black: A reinforcing filler added at 20% to 50% by weight that increases tensile strength and abrasion resistance by up to 10 times compared to unfilled rubber.
• Processing Oils: Paraffinic, naphthenic, or aromatic oils added at 5% to 30% by weight to reduce compound viscosity and modify cured rubber flexibility.

Is Oil a Key Raw Material in Synthetic Rubber?

Oil is a key raw material in synthetic rubber. Petroleum oil serves two distinct roles: as the primary feedstock for monomer generation through crude oil refining and steam cracking, and as a processing oil additive incorporated directly into rubber compounds during compounding. Crude oil naphtha is cracked at 750°C to 900°C to yield butadiene, ethylene, and propylene, as well as aromatics used to synthesize styrene, which forms the polymer backbone of synthetic rubber as a feedstock.  Petroleum-derived processing oils are blended into the rubber matrix at 5% to 30% by weight to improve uncured compound flow and control stiffness of the cured product as a compound additive. Aromatic oils are preferred in SBR tire compounds, though concerns over polycyclic aromatic hydrocarbon (PAH) content have driven a shift to treated distillate aromatic extract (TDAE) oils compliant with EU Directive 2005/69/EC.

How Is Synthetic Rubber Produced?

Synthetic rubber is produced through a four-stage industrial process: monomer production, polymerization, compounding, and vulcanization. Each stage transforms raw petrochemical feedstocks into a finished elastomeric material with defined mechanical and chemical properties. Monomer production begins with steam cracking naphtha or ethane at 750°C to 900°C, yielding reactive monomers purified to 99%+ purity before polymerization. Polymerization converts monomers into long-chain polymers in stirred-tank or tubular reactors at 5°C to 80°C and 1 to 10 bar pressure. The resulting polymer is isolated, dried, and baled into crumb or slab form. At the compounding stage, the base polymer is blended with carbon black, process oils, sulfur, and accelerators in internal mixers to produce a homogeneous compound. Vulcanization cures the compound in heated molds at 140°C to 200°C under 1 to 15 MPa pressure, permanently crosslinking the polymer chains into the finished elastomer.

What Is the Basic Process Used in Synthetic Rubber Manufacturing?

The basic process in synthetic rubber manufacturing follows a sequential chemical and mechanical workflow from monomer synthesis to vulcanized rubber fabrication. Follow the five steps. First, petroleum feedstocks undergo steam cracking at 750°C to 900°C to produce reactive monomers. Second, the purified monomers enter polymerization reactors where free-radical, anionic, or coordination catalysts initiate chain-growth reactions at 5°C to 80°C. Third, the polymerization reaction is terminated with a shortstop chemical (hydroxylamine or sodium dimethyldithiocarbamate) once the target conversion rate of 60% to 72% is reached in emulsion systems. Fourth, the latex is coagulated using salt-acid mixtures, and the crumb rubber is washed, dried at 100°C to 130°C, and baled at 25 to 35 kilograms per bale. Fifth, the dried rubber is delivered to compounders who blend it with functional additives on internal mixers at 60°C to 160°C, producing the final compound ready for molding, extrusion, or calendering.

Is Polymerization the Main Chemical Process Used?

Polymerization is the main chemical process used in synthetic rubber production. The process chemically links individual monomer molecules into long polymer chains with molecular weights from 100,000 to over 1,000,000 g/mol, creating the macromolecular structure responsible for rubber's elastic behavior. Three distinct methods apply across synthetic rubber manufacturing: emulsion polymerization (used for SBR and NBR), solution polymerization (used for polybutadiene and solution-SBR), and coordination polymerization (used for EPDM and cis-polyisoprene). Emulsion polymerization accounts for approximately 60% to 65% of global synthetic rubber polymerization capacity, conducted in water-based systems at 5°C (cold emulsion) to 50°C (hot emulsion). Solution polymerization uses hydrocarbon solvents and anionic catalysts to produce rubbers with more controlled microstructure and narrower molecular weight distribution, delivering superior performance in high-specification tire and industrial rubber applications.

What Are the Different Types of Synthetic Rubber?

The different types of synthetic rubber are listed below.

• Styrene-Butadiene Rubber (SBR): A copolymer of 23% to 25% styrene and 75% to 77% butadiene, used primarily in tire treads. Global production exceeds 5 million metric tons per year.
• Nitrile Rubber (NBR): A copolymer of acrylonitrile and butadiene with acrylonitrile content from 18% to 50%, delivering outstanding oil and fuel resistance for automotive seals and O-rings.
• Neoprene (Polychloroprene): A chloroprene-based rubber with balanced oil, ozone, heat, and flame resistance across an operating temperature range of -40°C to 120°C.
• EPDM Rubber: A terpolymer of ethylene, propylene, and diene monomer, providing outstanding weather, ozone, and UV resistance for roofing membranes and automotive seals.
• Butyl Rubber (IIR): A copolymer of isobutylene and isoprene with the lowest gas permeability among commercial rubbers, used in tire inner tubes and pharmaceutical closures.
• Silicone Rubber: A polysiloxane elastomer operating from -60°C to 230°C for medical devices, food-grade seals, and high-temperature industrial applications. The broad category of types of synthetic rubber encompasses additional specialty elastomers engineered for extreme chemical, thermal, and mechanical environments.

What Are the Main Types of Synthetic Rubber Used Today?

The main types of synthetic rubber used today are listed below.

• Styrene-Butadiene Rubber (SBR): Accounts for approximately 30% of total global synthetic rubber production, dominating passenger car and light truck tire manufacturing for its abrasion resistance and processing versatility.
• Polybutadiene Rubber (BR): A homopolymer of butadiene blended with SBR in tire compounds at 20% to 40% BR ratios to improve rolling resistance and cold-temperature flexibility.
• EPDM Rubber: The primary synthetic rubber for automotive weather seals, window profiles, and roofing membranes, with global production exceeding 1.5 million metric tons annually.
• Nitrile Rubber (NBR): The standard elastomer for oil-resistant seals, gaskets, and hoses in automotive, oil and gas, and industrial machinery applications.
• Silicone Rubber: Serves medical implants, food processing equipment, and high-temperature electrical insulation across healthcare, food safety, and electronics industries.
• Thermoplastic Elastomers (TPE/TPR): Processed as thermoplastics and performing as rubbers, used in overmolding, flexible components, and medical tubing at volumes exceeding 3 million metric tons per year globally.
• Neoprene (Polychloroprene): The preferred rubber for wetsuits, industrial hoses, and cable jacketing where balanced oil and weather resistance is required.

Are Types of Synthetic Rubber Connected to Types of Synthetic Polymers?

Types of synthetic rubber are connected to types of synthetic polymers. Every synthetic rubber is a synthetic polymer by definition, produced through the chemical polymerization of monomer molecules into long-chain macromolecular structures using industrial processes. The distinction lies in the elastic mechanical behavior of rubber-type polymers, which exhibit high elongation at break (100% to 800%) and glass transition temperatures (Tg) below room temperature, allowing flexibility at ambient conditions. Synthetic rubbers are classified within the broader polymer family as elastomers, a subcategory capable of large, reversible deformation through crosslinked three-dimensional networks. Non-elastomeric synthetic polymers like polystyrene lack a low Tg, while others like polyethylene and polypropylene possess a low Tg but exhibit semi-crystalline thermoplastic behavior rather than the amorphous, crosslinked network that defines rubber behavior.  Advances in synthetic polymer chemistry, including metallocene catalysis and living polymerization, directly influence the development of new synthetic rubber grades.

How Does Synthetic Rubber Compare With Natural Rubber?

Synthetic rubber and natural rubber are elastomeric materials capable of large elastic deformation, but differ substantially in origin, consistency, chemical resistance, and performance under extreme conditions. Natural rubber, derived from the latex of Hevea brasiliensis, consists primarily of cis-1,4-polyisoprene and offers exceptional tensile strength up to 30 MPa unfilled, superior to most synthetic rubber grades. Synthetic rubber is produced under controlled industrial conditions, delivering greater batch-to-batch consistency and engineered properties (oil resistance, heat resistance, flame retardancy) that natural rubber cannot achieve through its fixed polymer structure. Natural rubber degrades under ozone, UV, oils, and temperatures above 80°C without modification, whereas EPDM, NBR, and silicone are specifically formulated for resistance to the same conditions. Natural rubber is preferred in aircraft tires and high-performance engineering applications, while synthetic rubber dominates automotive fuel systems, roofing membranes, and medical devices. Detailed property data is available for natural rubber.

What Are the Key Differences Between Synthetic Rubber and Natural Rubber?

The key differences between synthetic rubber and natural rubber are listed below.

• Origin: Natural rubber is harvested from Hevea brasiliensis trees in Southeast Asia, while synthetic rubber is manufactured from petroleum-derived monomers in industrial chemical plants, reducing geographic supply concentration risk.
• Tensile Strength: Natural rubber achieves unfilled tensile strength up to 30 MPa through strain-induced crystallization. Carbon-black-reinforced SBR reaches 20 to 25 MPa, and NBR reaches 15 to 25 MPa under optimized compounding.
• Oil Resistance: NBR with 28% to 45% acrylonitrile content limits volume swell to below 10% after 72-hour immersion in ASTM Reference Oil No. 3. Natural rubber swells excessively in oil contact, making it unsuitable for fuel system applications.
• Temperature Range: Silicone rubber operates from -60°C to 230°C, and EPDM from -50°C to 150°C, far exceeding natural rubber's practical upper service limit of approximately 80°C.
• Weather Resistance: EPDM and neoprene resist ozone concentrations of 100 pphm without cracking over 72-hour exposure at 40°C. Natural rubber cracks within hours under equivalent ozone conditions without protective compounding.
• Consistency: Synthetic rubber delivers batch-to-batch molecular weight variation below 5%, while natural rubber varies significantly depending on the wintering period (February to May) and geographic origin. 

Is Natural Rubber More Elastic Than Synthetic Rubber?

Natural rubber is more elastic than most synthetic rubber grades. The high-cis microstructure of natural rubber polyisoprene (99.9% cis-1,4 content) produces strain-induced crystallization (SIC) under load, generating tensile strength values up to 30 MPa in unfilled compounds. No standard synthetic rubber achieves equivalent unfilled tensile strength through the same mechanism. Elongation at break of natural rubber reaches 700% to 800%, compared to SBR at 400% to 600%, NBR at 300% to 500%, and EPDM at 150% to 400%, depending on formulation. Resilience (rebound elasticity) of natural rubber reaches 70% to 80% at room temperature, outperforming SBR at 55% to 65% and NBR at 40% to 55%. For aircraft tires, bridge bearings, and seismic isolation pads where maximum elasticity and dynamic fatigue resistance are required, natural rubber remains the preferred elastomeric material.

What Is Thermoplastic Rubber (TPR) in Synthetic Rubber Materials?

Thermoplastic rubber (TPR) is a class of synthetic rubber that combines the elastic performance of conventional vulcanized rubber with the melt-processability of thermoplastics, allowing processing on standard injection molding and extrusion equipment without chemical vulcanization. TPR achieves rubber-like behavior through physical crosslinks formed by hard polymer domains dispersed within a soft elastomeric matrix, rather than covalent sulfur crosslinks. The hard domains (polystyrene, polypropylene, or polyurethane) soften or melt at 150°C to 220°C, enabling reprocessing, while the soft elastomeric segments (polybutadiene, polyisoprene, or polyolefin) provide flexibility and elastic recovery at service temperatures. TPR operates across approximately -50°C to 120°C, depending on grade, with hardness ranging from 20 Shore A to 50 Shore D. Detailed material data for thermoplastic rubber (TPR).

What Is Silicone in Synthetic Rubber Materials

Silicone rubber is a synthetic elastomer based on a polysiloxane polymer backbone, where alternating silicon and oxygen atoms (Si-O-Si) form the main chain with organic groups (methyl, vinyl, or phenyl) attached to the silicon atoms. The inorganic Si-O backbone distinguishes silicone from all carbon-backbone synthetic rubbers, conferring exceptional thermal stability, electrical insulating properties, and biocompatibility. Silicone rubber maintains mechanical properties across -60°C to 230°C for standard grades, and up to 300°C for specialty formulations. Tensile strength ranges from 4 to 12 MPa, with elongation at break of 100% to 700% and dielectric strength of 15 to 25 kV/mm for high-voltage electrical insulation applications. In medical applications, platinum-cured silicone meets USP Class VI and ISO 10993 biocompatibility standards for implantable devices, surgical tubing, and drug delivery components.

What Is Neoprene in Synthetic Rubber Materials?

Neoprene (polychloroprene) is a synthetic rubber produced by the free-radical polymerization of chloroprene monomer (2-chloro-1,3-butadiene, C₄H₅Cl), where the chlorine atom in the polymer chain provides resistance to oils, flames, ozone, and weathering. Neoprene was the first commercially successful synthetic rubber, developed by DuPont in 1931. Neoprene operates across -40°C to 120°C, delivering tensile strength of 10 to 25 MPa and elongation at break of 200% to 600% depending on formulation. The material achieves a limiting oxygen index (LOI) of approximately 26% to 28%, classifying it as a self-extinguishing rubber for flame-resistance applications. Primary applications include wetsuits, industrial hose liners, cable jacketing, automotive belts, and construction gaskets. The performance distinctions from silicone across sealing, thermal, and chemical resistance requirements are covered in detail in silicone vs. neoprene.

Is Thermoplastic Rubber (TPR) Considered a Form of Synthetic Rubber?

Thermoplastic rubber (TPR) is considered a form of synthetic rubber. TPR exhibits the elastic deformation and recovery characteristics that define rubber behavior, including elongation at break values of 300% to 700% and hardness ranging from 20 Shore A to 50 Shore D.. The material is manufactured entirely from synthetic petrochemical polymers through industrial polymerization processes. The primary distinction of TPR within the synthetic rubber category is its thermoplastic processing behavior: TPR softens and flows above 150°C to 220°C and recovers its elastomeric properties upon cooling, without requiring chemical vulcanization. Conventional synthetic rubbers (SBR, NBR, EPDM) require irreversible sulfur crosslinking during vulcanization, making them thermoset materials that cannot be remelted. TPR's reprocessability allows scrap material to be reground and reused, reducing manufacturing waste. Thermoplastic rubber (TPR) serves across footwear, medical device, automotive, and consumer product applications.

What Are the Examples of Synthetic Rubber Materials?

The examples of synthetic rubber materials are listed below.

• Styrene-Butadiene Rubber (SBR): A copolymer of styrene and butadiene representing the highest-volume synthetic rubber globally, with production exceeding 5 million metric tons annually
• Neoprene (Polychloroprene): A chloroprene-based rubber offering balanced oil, flame, and weather resistance
• Nitrile Rubber (NBR): An acrylonitrile-butadiene copolymer with outstanding resistance to petroleum oils and fuels
• Butyl Rubber (IIR): An isobutylene-isoprene copolymer with the lowest gas permeability among commercial rubbers
• EPDM Rubber: A terpolymer providing superior weather, ozone, and UV resistance
• Silicone Rubber: A polysiloxane elastomer with a service temperature range of -60°C to 230°C
• Polyurethane Rubber (PU Rubber): A segmented polyurethane elastomer with the highest abrasion resistance among commercial rubbers
• Acrylonitrile Butadiene Rubber (NBR Variant): A high-ACN specialty grade formulated for extreme oil resistance above 36% acrylonitrile content
• Chloroprene Rubber: The polymer class forming the chemical basis of all neoprene products
• Thermoplastic Rubber (TPR/TPE): A reprocessable elastomeric material combining rubber performance with thermoplastic processability

1. Styrene-Butadiene Rubber (SBR)

Styrene-Butadiene Rubber (SBR) is the world's most widely produced synthetic rubber, a random copolymer of approximately 23% to 25% styrene and 75% to 77% butadiene by weight, manufactured through emulsion or solution polymerization. SBR was developed as a replacement for natural rubber during World War II under the U.S. government's GR-S program and has dominated the global rubber market since the 1950s. SBR delivers tensile strength of 15 to 25 MPa in carbon-black-reinforced compounds, abrasion resistance 25% to 40% superior to natural rubber in tire tread applications, and an operating temperature range of -50°C to 100°C. Tire tread production accounts for approximately 65% to 70% of total SBR consumption globally. SBR is priced at approximately [$1.20 to $1.80] per kilogram for standard emulsion grades, offering cost-competitive performance with greater processing consistency than natural rubber across high-volume manufacturing operations.

2. Neoprene (Polychloroprene)

Neoprene (polychloroprene) is a synthetic rubber produced from the polymerization of chloroprene monomer, first commercialized by DuPont in 1931 as the first practical synthetic rubber alternative to natural rubber. The chlorine content of polychloroprene (approximately 40% by weight) imparts flame resistance, oil resistance, and ozone resistance that distinguish neoprene from hydrocarbon-backbone rubbers. Neoprene operates across -40°C to 120°C, with tensile strength of 10 to 25 MPa and elongation at break of 200% to 600% depending on compound formulation. The limiting oxygen index (LOI) of 26% to 28% classifies it as a self-extinguishing rubber for flame-resistance applications. Primary uses include wetsuits (2 mm to 7 mm panels), industrial hose liners, cable jacketing, automotive belts, and construction gaskets. Neoprene rubber sheet is priced at [$3 to $12] per kilogram depending on grade and order volume.

3. Nitrile Rubber (NBR)

Nitrile Rubber (NBR) is a synthetic copolymer of acrylonitrile and butadiene, produced through emulsion polymerization at acrylonitrile contents ranging from 18% to 50% by weight. The acrylonitrile level directly determines oil resistance and low-temperature flexibility, requiring the compounder to balance the two properties for each application. NBR with 28% to 33% acrylonitrile content delivers a practical balance of oil resistance and cold-temperature flexibility (glass transition temperature of approximately -35°C to -25°C) for automotive fuel system seals and O-rings. Tensile strength ranges from 15 to 25 MPa, with elongation at break of 300% to 500%. NBR resists petroleum oils with volume swell below 15% after 70-hour immersion at 100°C in ASTM Reference Oil No. 3. NBR compound is priced at [$2.00 to $4.50] per kilogram depending on acrylonitrile content and formulation.

4. Butyl Rubber (IIR)

Butyl Rubber (IIR) is a synthetic rubber produced through cationic polymerization of isobutylene (95% to 99%) and isoprene (1% to 5%) at -90°C to -100°C using aluminum chloride catalyst. The near-complete absence of unsaturation in the polymer backbone gives butyl rubber its defining characteristic: the lowest gas permeability of any commercially produced rubber. Butyl rubber's oxygen permeability is approximately 15 times lower than natural rubber and over 100  times lower than SBR at room temperature, making it standard for tire inner tubes, tubeless tire inner liners, and pharmaceutical vial stoppers. The operating temperature range spans -40°C to 120°C, with tensile strength of 10 to 20 MPa and elongation at break of 400% to 700%. Standard butyl rubber is priced at [$2.50 to $5.00] per kilogram, with halogenated variants (chlorobutyl and bromobutyl) at [$3.50 to $7.00] per kilogram.

5. Ethylene Propylene Diene Monomer (EPDM) Rubber

EPDM rubber is a terpolymer elastomer produced from ethylene (45% to 75%), propylene (25% to 50%), and a diene monomer (ethylidene norbornene, dicyclopentadiene, or 1,4-hexadiene at 1% to 12%) through coordination polymerization using Ziegler-Natta or metallocene catalysts. The saturated backbone, with unsaturation confined to pendant diene side chains, provides outstanding resistance to ozone, weathering, UV radiation, and oxidative aging. EPDM operates across -50°C to 150°C in standard grades, and up to 175°C in heat-stabilized formulations. Tensile strength ranges from 7 to 20 MPa, and elongation at break spans 150% to 600%. EPDM dominates automotive door and window seals, roofing membranes (covering approximately 20% of U.S. flat roofing area), and electrical wire insulation. EPDM compound is priced at [$1.80 to $3.50] per kilogram for standard grades.

6. Silicone Rubber

Silicone rubber is a synthetic elastomer based on polydimethylsiloxane (PDMS) polymer, where the alternating silicon-oxygen (Si-O) backbone with methyl, vinyl, or phenyl substituents provides thermal stability, electrical insulation, and biocompatibility unmatched by carbon-backbone rubbers. The polymer is compounded with pyrogenic silica at 7% to 50% by weight as a reinforcing filler and cured through peroxide or platinum-catalyzed addition cure systems. Silicone rubber maintains elastomeric properties across -60°C to 230°C for general grades, and -100°C to 300°C for specialty phenyl and heat-stabilized methyl-vinyl grades. Tensile strength ranges from 4 to 12 MPa, with dielectric strength of 15 to 25 kV/mm for electrical insulation applications. Biocompatibility under USP Class VI and ISO 10993 standards qualifies silicone for implantable devices and food-contact applications. Silicone rubber compound is priced at [$8 to $35] per kilogram, depending on grade and purity level.

7. Polyurethane Rubber (PU Rubber)

Polyurethane rubber (PU rubber) is a synthetic elastomer produced by the reaction of polyol and diisocyanate components, forming a segmented block copolymer with alternating hard (urethane) and soft (polyol) segments that delivers the highest abrasion resistance among commercially produced rubbers. The abrasion resistance, measured by the DIN 53516 test, reaches 20 to 80 mm³ volume loss, significantly superior to natural rubber (100 to 150 mm³) and SBR (100 to 180 mm³). PU rubber operates across -40°C to 90°C, with tensile strength of 20 to 55 MPa and elongation at break of 300% to 700%, delivering the best unfilled tensile performance among synthetic rubber types. Shore hardness ranges from 30 Shore A to 70 Shore D. Primary applications include industrial rollers, scraper blades, mining screens, skateboard wheels, and hydraulic seals. Raw PU rubber compound is priced at [$4 to $15] per kilogram.

8. Acrylonitrile Butadiene Rubber (NBR Variant)

Acrylonitrile Butadiene Rubber (NBR) in its high-ACN specialty variant is formulated with acrylonitrile content exceeding 36% by weight, producing an elastomer with extreme resistance to petroleum oils, aromatic fuels, and hydrocarbon solvents beyond standard NBR grades. At 36% to 50% acrylonitrile content, volume swell after 70-hour immersion in ASTM Reference Oil No. 3 at 100°C drops below 10%, compared to 20% to 30% for standard 28% ACN-grade NBR. High-ACN NBR variants are used in fuel injection system components, oil well equipment seals, and chemical-resistant gloves where standard NBR cannot meet aggressive fluid resistance requirements. The trade-off is reduced low-temperature flexibility, with glass transition temperature rising to -15°C to -5°C at high ACN content compared to -35°C for standard grades. High-ACN NBR is priced at [$3.50 to $6.00] per kilogram.

9. Chloroprene Rubber

Chloroprene rubber is the polymer class produced through free-radical emulsion polymerization of 2-chloro-1,3-butadiene (chloroprene) monomer, forming the chemical basis from which all neoprene products are derived. The chlorine substituent accounts for approximately 40% of the molecular weight per repeat unit, imparting polar character that resists non-polar hydrocarbon fluids and aliphatic oils. Chloroprene rubber is produced in grades differentiated by molecular weight distribution, crystallization rate, and Mooney viscosity (ML(1+4) at 100°C from 30 to 120 MU) for extrusion, calendering, compression molding, and injection molding applications. Tensile strength of compounded chloroprene rubber reaches 10 to 25 MPa, with an operating temperature range of -40°C to 120°C. Applications include automotive drive belts, industrial hoses, bridge bearing pads, cable jacketing, and adhesive formulations. Raw chloroprene rubber is priced at [$3.00 to $6.50] per kilogram.

10. Thermoplastic Rubber (TPR / TPE)

Thermoplastic rubber (TPR), synonymously referred to as thermoplastic elastomer (TPE), achieves rubber-like elasticity through physical rather than chemical crosslinking, allowing processing on conventional injection molding equipment at 180°C to 220°C and reprocessing from scrap without property degradation. TPR encompasses several polymer families: styrenic block copolymers (SBS, SEBS), thermoplastic polyolefin elastomers (TPO), thermoplastic polyurethane (TPU), thermoplastic vulcanizates (TPV), and thermoplastic polyester elastomers (TPEE). Hardness ranges from 20 Shore A to 50 Shore D across the TPR/TPE family, with tensile strength of 5 to 40 MPa depending on the polymer system. Applications include overmolded grips, medical tubing, footwear soles, automotive interior trim, and flexible consumer product components. TPR material is commercially priced at [$2.50 to $10.00] per kilogram, depending on polymer family and hardness grade.

What Are the Advantages of Using Synthetic Rubber?

The advantages of using synthetic rubber are listed below.

• Engineered Chemical Resistance: NBR with 36% acrylonitrile content limits volume swell to below 10% in ASTM Reference Oil No. 3 at 100°C, qualifying it for direct fuel system contact where natural rubber is unsuitable.
• Extended Temperature Range: Silicone rubber operates from -60°C to 230°C and EPDM from -50°C to 150°C, far exceeding natural rubber's practical service limit of approximately 80°C.
• Consistent Supply: Synthetic rubber production is distributed across petrochemical facilities in North America, Europe, and Asia, reducing the geographic supply concentration risk associated with natural rubber sourced primarily from Southeast Asia.
• Batch-to-Batch Consistency: Synthetic rubber polymerization delivers molecular weight variation below 5% from batch to batch, compared to natural rubber, where molecular weight varies significantly by the wintering period (February to May) and geographic origin. 
• Flame and Ozone Resistance: Neoprene achieves a limiting oxygen index of 26% to 28%, and EPDM resists ozone concentrations of 100 pphm without cracking over 72-hour exposure at 40°C.
• Reprocessability (TPR/TPE): Thermoplastic rubber grades are remelted from production scrap, reducing material waste by 15% to 30% in injection molding operations compared to thermoset rubber compounds.

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