Elastomers: Types, Manufacturing, and How to Ship Elastomer Chemicals

Elastomers are polymers with elastic properties. They can be stretched to many times their original length and snap back to their original shape when released. Think rubber bands, tires, gaskets, hoses, and seals. The chemicals used to manufacture elastomers (monomers, curing agents, accelerators, and processing oils) ship in liquid bulk by tanker truck from chemical producers to rubber and elastomer manufacturers.

Global elastomer production exceeds 28 million metric tons annually, with synthetic elastomers accounting for roughly 70% of that volume. The raw materials for these polymers are specialty chemicals that require strict temperature control, hazmat compliance, and contamination-free equipment. For shipper-led capacity and hazmat-fluent execution on this freight, see Total Connection's liquid bulk and chemical logistics service.

What elastomers are

Elastomers are cross-linked polymers where the molecular chains are connected by chemical bonds that allow them to deform under stress and recover when the stress is removed. Natural rubber was the original elastomer. Today, the majority of elastomers are synthetic, engineered polymers designed for specific performance characteristics.

The elasticity comes from the molecular structure. The polymer chains are long and flexible, but the cross-links prevent them from sliding past each other permanently. When you stretch an elastomer, the chains uncoil and align. When you release the stress, the cross-links pull the chains back to their original random coil configuration.

Natural vs. synthetic elastomer types

Natural rubber (NR) is harvested from latex, a milky fluid from rubber trees (Hevea brasiliensis). It offers excellent tensile strength, tear resistance, and low-temperature flexibility. Natural rubber is used in tires, medical gloves, and high-performance seals. The primary limitation is poor resistance to oils, solvents, and ozone degradation.

Styrene-butadiene rubber (SBR) is the most widely produced synthetic elastomer, accounting for over 40% of global synthetic rubber production. It's manufactured by copolymerizing styrene and butadiene monomers. SBR is used in tires, conveyor belts, footwear, and adhesives. Both monomers are hazardous materials. Butadiene is a DOT Class 2.1 flammable gas (UN 1010). Styrene is a Class 3 flammable liquid (UN 2055).

Nitrile rubber (NBR) is polymerized from acrylonitrile and butadiene. It provides excellent resistance to oils, fuels, and chemicals, making it the standard choice for fuel hoses, gaskets, O-rings, and oil seals. Acrylonitrile is a Class 3 flammable liquid and Class 6.1 toxic substance (UN 1093). NBR manufacturing requires strict containment and ventilation systems.

EPDM rubber (ethylene propylene diene monomer) offers excellent weather, ozone, and UV resistance. It's used in roofing membranes, automotive weatherstripping, outdoor seals, and electrical insulation. EPDM does not resist petroleum-based fluids well, which limits its use in fuel and oil applications.

Silicone elastomers maintain elasticity across extreme temperatures from -75°F to 500°F. This makes them essential in medical devices, food processing equipment, aerospace applications, and electronics. Silicone precursors ship as specialty chemicals with strict purity requirements because even trace contamination affects curing and final properties.

Polyurethane elastomers provide exceptional abrasion resistance and load-bearing capacity. They're used in mining equipment, industrial rollers, skateboard wheels, and high-wear applications. Polyurethane components (polyols and isocyanates) ship in liquid bulk, with isocyanates classified as DOT Class 6.1 toxic substances (UN 2206 for TDI, UN 2811 for MDI).

Elastomer manufacturing processes

Elastomer manufacturing follows two primary routes: emulsion polymerization and solution polymerization. Emulsion polymerization produces SBR and NBR by suspending monomers in water with surfactants and initiators. The process runs at 40-70°C and produces latex that can be coagulated into solid rubber or used directly in latex applications like gloves and adhesives.

Solution polymerization produces specialty elastomers like EPDM and some grades of SBR in organic solvents. This process allows better control over molecular weight distribution and polymer microstructure, producing elastomers with superior performance characteristics. The solvents must be recovered and recycled, adding complexity and cost.

After polymerization, the raw elastomer undergoes compounding. This involves mixing the base polymer with fillers (carbon black, silica), processing oils, antioxidants, accelerators, and curing agents. The compounding stage determines the final rubber's hardness, tensile strength, color, and processing characteristics.

Vulcanization is the final step. Sulfur-based curing systems create cross-links between polymer chains, converting the soft, sticky raw elastomer into a durable, elastic material. The process typically runs at 140-180°C under pressure in molds or continuous vulcanization lines. Temperature control during vulcanization is critical. Too low and the cure is incomplete. Too high and the polymer degrades.

Chemicals that go into elastomer manufacturing

Elastomer manufacturing consumes a range of liquid bulk chemicals. Monomers are the building blocks that polymerize into rubber. Butadiene, styrene, acrylonitrile, isoprene, and ethylene are shipped in bulk by tanker or pipeline. Curing agents and vulcanization chemicals include sulfur compounds, peroxides, and specialty cross-linkers that create the chemical bonds between polymer chains.

Accelerators are chemicals that speed up the curing process and allow vulcanization at lower temperatures. Common accelerators include thiazoles, sulfenamides, and thiurams, many of which are toxic or sensitizing agents. Processing oils are plasticizers that improve processing and final product properties. Naphthenic and paraffinic oils are the most common, shipped in bulk as Class 3 flammable liquids or non-hazardous depending on flash point.

Antioxidants and stabilizers prevent degradation during manufacturing and service life. These include phenolic antioxidants, amine antioxidants, and UV stabilizers. Many ship as molten liquids or in heated tankers to maintain pumpability.

Temperature requirements for shipping elastomer chemicals

Temperature management is critical for elastomer chemical logistics. Monomers like styrene and butadiene must be kept below their auto-polymerization temperatures. Styrene begins to polymerize above 90°F without proper inhibitor levels, and runaway polymerization can occur above 150°F. Butadiene ships as a liquefied gas under pressure at temperatures below its boiling point of 24°F.

Isocyanates used in polyurethane elastomers are moisture-sensitive and temperature-sensitive. Exposure to humidity causes them to react and form ureas, ruining the product. They typically ship at controlled temperatures between 60-80°F in nitrogen-blanketed tankers to prevent moisture ingress and premature reaction.

Processing oils and plasticizers increase in viscosity at low temperatures and may require heated tankers during winter months. Naphthenic oils typically remain pumpable above 32°F, but paraffinic oils with higher pour points may need heating to 100-120°F for discharge.

Molten additives like certain antioxidants and processing aids ship in heated tankers to maintain liquid form. These products solidify at ambient temperature and require steam coils or electric heating systems to maintain 200-300°F throughout transit.

For guidance on managing temperature-sensitive chemical shipments, see our guide on how to ship temperature-sensitive chemicals.

Shipping elastomer chemicals: equipment and compliance

Many elastomer raw materials are hazardous. Butadiene is a flammable gas. Styrene, acrylonitrile, and many solvents are flammable liquids. Isocyanates are toxic. Peroxide curing agents are oxidizers. Each product requires appropriate carrier certification, tanker equipment, documentation, and handling.

Equipment matching is critical. Elastomer chemicals span a range of tank requirements from standard stainless steel to specialized pressure vessels for gaseous monomers. Temperature control may be necessary for products that polymerize prematurely at elevated temperatures or solidify at low temperatures.

Product purity requirements are stringent. Elastomer manufacturing processes are sensitive to trace contaminants that can affect polymerization kinetics, cure rates, and final product properties. Tank wash verification is essential. A tanker that previously carried incompatible cargo can introduce contaminants that ruin an entire batch.

Many elastomer chemicals fall under hazmat trucking regulations that require specific carrier authority, driver certification, and emergency response planning. For broader context on chemical shipping requirements, see our overview of how to ship chemicals.

How Total Connection ships elastomer chemicals

We handle the full range of elastomer manufacturing chemicals: monomers, curing agents, processing oils, and additives. Our carrier network includes operators with the equipment, hazmat certifications, and purity standards that elastomer manufacturers require.

Every shipment gets carrier screening for appropriate hazmat authority and safety records, equipment matching to the specific product's temperature and containment requirements, tank wash verification with prior cargo documentation, temperature monitoring for heat-sensitive and cold-sensitive products, and a dedicated account manager who coordinates from pickup through delivery.

Call 732-817-0401 or request a quote for your elastomer chemical logistics.

Frequently Asked Questions

What is an elastomer?

An elastomer is a polymer with elastic properties. It can be stretched significantly and returns to its original shape when the stress is removed. Rubber bands, tires, gaskets, hoses, and seals are all made from elastomers. Natural rubber is an elastomer, but most modern elastomers are synthetic polymers engineered for specific performance characteristics.

What's the difference between natural and synthetic elastomers?

Natural rubber is harvested from latex of rubber trees and offers excellent tensile strength and low-temperature flexibility but poor oil and ozone resistance. Synthetic elastomers like SBR, NBR, and EPDM are manufactured from petroleum-based monomers and can be engineered for specific properties such as oil resistance, temperature range, or chemical compatibility that natural rubber cannot match.

Are elastomer chemicals hazardous materials?

Many are. Butadiene is a DOT Class 2.1 flammable gas (UN 1010). Styrene is a Class 3 flammable liquid (UN 2055). Acrylonitrile is both Class 3 and Class 6.1 (UN 1093). Isocyanates are Class 6.1 toxic substances. Peroxide curing agents are Class 5.2 oxidizers. Each product requires specific carrier certification, equipment, and documentation based on its hazmat classification.

Why are temperature requirements important for elastomer chemical shipping?

Many elastomer chemicals polymerize prematurely if exposed to high temperatures or solidify at low temperatures. Styrene begins auto-polymerization above 90°F. Butadiene ships as a liquefied gas below 24°F. Isocyanates require controlled temperatures between 60-80°F to prevent moisture reaction. Processing oils may need heating to 100-120°F for discharge in winter. Temperature control prevents product loss and safety incidents.

What tanker equipment is needed for elastomer chemicals?

It varies by product. Liquid monomers and processing oils typically ship in stainless steel chemical tankers. Gaseous monomers like butadiene require pressure vessels. Heat-sensitive products need temperature monitoring and may require insulated or refrigerated equipment. Cold-weather shipments of viscous products require heated tankers with steam coils or electric heating. Tank cleanliness and prior cargo verification are mandatory for all elastomer chemicals.