The Rubber Compounds Behind Every Precision Part
HOEI works with a comprehensive range of rubber elastomers, each selected for its unique chemical and mechanical properties. Understanding the right material for your application is the foundation of a durable, high-performance product.
Material Reference Guide
NR
Natural Rubber
Derived from the latex of the Hevea brasiliensis tree, Natural Rubber offers exceptional elasticity, high tensile strength, and outstanding tear resistance, making it a preferred choice for dynamic sealing applications, vibration dampers, and flexible couplings where resilience and fatigue resistance are critical.
SBR
Styrene‑Butadiene Rubber
One of the most widely used synthetic rubbers, SBR delivers good abrasion resistance, aging stability, and cost-effective performance across a broad temperature range, making it a reliable material for automotive brake components, conveyor belts, seals, and general-purpose gaskets where moderate mechanical demands apply.
IIR
Butyl Rubber
Butyl Rubber is renowned for its exceptionally low gas permeability and excellent resistance to heat, weathering, and many chemicals, which makes it the material of choice for inner tubes, pharmaceutical stoppers, steam hoses, and air-retention sealing applications where airtight integrity is non-negotiable.
NBR
Nitrile Rubber
NBR is the industry standard for oil and fuel resistance, offering superior performance in contact with petroleum-based fluids, hydraulic oils, and greases, making it indispensable for automotive fuel system seals, O-rings, oil hoses, and industrial applications where hydrocarbon exposure is a primary design consideration.
CR
Neoprene / Chloroprene Rubber
Neoprene provides a well-balanced combination of weather resistance, flame retardancy, moderate chemical resistance, and good mechanical properties, making it a versatile choice for outdoor seals, wetsuits, cable jacketing, roofing membranes, and applications that demand reliable performance in fluctuating environmental conditions.
EPDM
EPDM Rubber
Ethylene Propylene Diene Monomer rubber excels in resistance to UV radiation, ozone, steam, and hot water, delivering long-term outdoor durability that makes it the dominant material for automotive door and window seals, roofing sheets, HVAC gaskets, and any sealing application exposed to harsh climatic environments.
Q
Silicone Rubber
Silicone Rubber maintains its flexibility, electrical insulation properties, and biocompatibility across an extreme temperature range from −60 °C to +230 °C, making it the preferred material for medical device seals, food-grade components, electronic potting, baby products, and any application where thermal stability and safety compliance are essential.
FKM
Viton / Fluoroelastomer
FKM fluoroelastomers offer unmatched resistance to aggressive chemicals, fuels, and high temperatures up to 200 °C, making them the material of choice for demanding aerospace, automotive, and chemical processing seals where exposure to fuels, lubricants, solvents, and hot gases would quickly degrade conventional rubber compounds.
AU
Polyurethane Rubber
Polyurethane Rubber delivers exceptional abrasion resistance, high load-bearing capacity, and good oil resistance, making it an ideal material for hydraulic seals, wheels, bushings, and mining or industrial wear components where mechanical toughness and resistance to surface degradation are the primary engineering requirements.
FVMQ
Fluorosilicone Rubber
Fluorosilicone combines the broad temperature performance of silicone with the fuel and oil resistance of fluoroelastomers, making it a specialist material used in aerospace fuel system seals, automotive emission control components, and applications that simultaneously face extreme temperatures and aggressive fluid environments.
ACM
Polyacrylic Rubber
ACM offers excellent resistance to hot oils, automatic transmission fluids, and heat up to 175 °C, making it well-suited for automotive transmission seals, power steering components, and engine bay applications where long-term exposure to high-temperature lubricants demands a material with superior oxidation and thermal stability.
ECO
Epichlorohydrin Rubber
Epichlorohydrin Rubber combines low gas permeability with good oil resistance, ozone resistance, and moderate temperature capability, making it a specialized choice for fuel hoses, emission control seals, and anti-vibration components in automotive applications where a balance between fuel impermeability and mechanical flexibility is required.