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Other Available Metric O-Ring Materials

Fluorosilicone Rubber (FVMQ)
Hydrogenated Nitrile (HNBR)
Highly Saturated Nitrile (HSN)
Carboxylated Nitrile (XNBR)
Butyl Rubber (IIR)
Styrene-Butadiene Rubber (SBR)
Chloroprene Rubber/ Neoprene (CR)
Polyurethane (AU, EU)
Polyacrylate (ACM)
Epichlorohydrin (CO, ECO, GECO)
Natural Rubber (NR)
Ethylene/Acrylic (AEM)

 

Fluorosilicone Rubber (FVMQ)

Fluorosilicone is like silicone rubber, bonding trifluoropropyl, methyl, and vinyl as side chains. The mechanical and physical properties are similar to VMQ. However, FVMQ offers improved fuel and mineral oil resistance.

Service Temperature

For FVQM the Service Temperatures are from -60° C to 177° C. In dry heat, the serviceable temperature range can extend to 232° C.

Hardness

45 to 80 Shore A are available.

Colors

Yellow & blue are available, in addition to any customer-assigned color.

Applications

FVMQ offers excellent low-temperature flexibility, and is good for fuel & aromatic mineral oil. It is usually applied in contact with jet and automotive fuels, most solvents, or engine oil, especially in the aerospace industry.

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Hydrogenated Nitrile (HNBR) or Highly Saturated Nitrile (HSN)

Hydrogenated Nitrile is a synthetic polymer that is obtained by saturating the hydrocarbon chains of nitrile rubber with hydrogen. This special hydrogenation process significantly reduces double bonds in the main chain of the NBR polymer.  As a result, HNBR possesses superior heat, ozone & chemical resistance, and superior mechanical characteristics over standard Nitriles.

Service Temperature

HNBR's service temperature ranges from -40° C to 150° C, while some special compounds can handle up to 160° C.

Hardness

55 to 90 Shore A are available.

Colors

Black, green, blue, brown, rust and gray are available, in addition to any customer-assigned color.

Applications

HNBR has a wide variety of applications in the auto and oil industries. For environmental requirements, HCFC will be replaced by ozone-safe refrigerants-HFCs. In old air conditioning and refrigeration equipment, Chloroprene (CR) and Fluoroelastomer (FKM) are popular materials with coolant system of HCFC (or CFC) and mineral oil. However, CR and FKM are not adequate in the newer coolant systems HFC134a (R134a) and PAG lube, because CR will degrade PAG lube, and FKM will swell more in R134a.  HNBR is the available rubber for these Applications.

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Carboxylated Nitrile (XNBR)

Cabboxylated Nitrile is similar to Nitrile rubber, but the polymer backbone has been chemically modified with Carboxylic Acid. The result is XNBR with excellent abrasion and tear resistance, superior to traditional NBR. For this reason, XNBR-based parts are usually applied in dynamic assemblies such as seals and rod wipers.

Service Temperature

XNBR's service temperature ranges from -20° C to 100° C, or up to 125° C.  When exposed to service temperatures higher than 100° C, lifetime will generally be shortened.

Hardness

50 to 90 Shore A are available.

Colors

Black, white and gray are available, in addition to any customer-assigned color.

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Butyl Rubber (IIR)

Butyl rubber is composed by copolymerizing isobutylene with small amounts of isoprene. Like EPDM, it possesses excellent resistance to chemical & polar fluids, outstanding electrical insulation, and good ozone resistance.  Low gas & moisture permeability and high shock absorption are the special properties of butyl rubber. These properties have made butyl rubber the polymer choice in a variety of Applications.

Service Temperature

For IIR the Service Temperature can be designed from -55° C to 100° C.

Hardness

50 to 70 Shore A are available

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Styrene-Butadiene Rubber (SBR)

The most widely synthetic rubber in the world is SBR, a copolymer of styrene and butadiene. For the most part, SBR is blended with natural rubber and butadiene rubber for use in tires. SBR is weak and unusable without reinforcement by carbon black, but is strong and abrasion–resistant with carbon black reinforcement.  Weaknesses of SBR are poor oil, weathering, UV, oxygen & ozone resistance, due to the double bond in the polymer backbone.

Service Temperature

The Service Temperature of SBR can be designed from -55° C to 100° C.

Hardness

50 to 70 Shore A are available

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Chloroprene Rubber/ Neoprene (CR)

Chloroprene was one of the first successful synthetic elastomers, developed in 1931 by DuPont. It is prepared by emulsion polymerization of chloroprene, or 2-chlorobutadiene. CR is a multi-purpose elastomer which yields a balanced combination of properties. It has good resistance to sun, ozone and weathering, and performs well in contact with oils and many chemicals. It also displays outstanding physical toughness and good resistance to fire.

Service Temperature

The service temperature of Chloroprene can be designed from -40° C to 100° C, or up to 125° C depending on different grades.  When exposed to service temperatures higher than 100° C, lifetime will generally be shortened.

Hardness

30 to 90 Shore A are available.

Colors

Black, white, rust, yellow and blue are available, in addition to any customer-assigned color.

Applications

Chloroprene has been used in thousands of diverse environments, including automotive, wire and cable industries.

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Polyurethane (AU, EU)

The millable Polyurethane rubbers are distinguished by two types; one is polyester urethane (AU), the other is polyether urethane (EU). AU type urethanes have outstanding oil, fuel and solvent resistance but can be attacked by hydrolysis, EU type urethanes are not attacked by hydrolysis and still offer a fuel and oil resistance comparable to low ACN ( 18~22% ACN) nitriles or HNBRs. Any type polyurethane all have excellent wear resistance, high tensile strength and high elasticity in comparison with any other elastomers.

We also can offer any type thermoplastic urethane (TPU).

Service Temperature

The Service Temperature of PU is -40° C to 80° C, and can tolerate service temperatures up to 100° C, with a shortened lifetime.

Hardness

60 to 93 Shore A are available.

Colors

Black, transparent, green, orange are available, in addition to any customer-assigned colors.

Applications

Polyurethanes are usually are applied in mechanical industries, especially in places that require higher wear resistance and higher strength. In some environments, moisture condensing on the surface of rubber seal will cause hydrolysis of AU, so choosing EU is better. But EU doesn’t resist well to oil, the lubricant must use higher aniline point oil.

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Polyacrylate (ACM)

Polyacrylates or simply acrylate rubbers are copolymers having two major components: the backbone ( monomeric acid ester of alkyl or alkoxy) and the reactive cure-site. ACM’s are high heat and oil resistant specialty elastomers. It also resists oxygen and ozone even at high temperature. The low temperature flexibility and chemical resistant of ACM is not good.

Service Temperature

For standard ACM the Service Temperature is -15° C to 150° C, and can tolerate service temperatures up 175° C with a shortened lifetime.  The low service temperature of some special compounds can be down to -25° C.

Hardness

45 to 80 Shore A are available.

Colors

Black, white, orange are available, in addition to any customer-assigned color.

Applications

Polyacrylates usually are applied in the automotive industry, especially in automatic transmission fluid systems.

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Epichlorohydrin (CO, ECO, GECO)

Hydrin® is the trade name of epichlorohydrin elastomers made by Zeon Chemicals. Epichlorohydrin elastomers are available as a homopolymer (CO), copolymer (ECO,GCO), and terpolmer (GECO). All epichlorohydrin rubbers offer low temperature flexibility, resistance to oils, fuels and common solvents. Epichlorohydrin has good waetherability and good dynamic properties.

Service Temperature

The Service Temperature of epichlorohydrin can be designed from -40° C to 125° C, or up to 135° C.

Hardness

50 to 80 Shore A are available.

Colors

Black is available, in addition to any customer-assigned color.

Applications

Typical applications of epichlorohydrin are in the automotive and industrial fields.

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Natural Rubber (NR)

Natural rubber is produced from the latex of the Hevea brasiliensis and the chemical name of the polymer is polyisoprene. Polyisoprene also can be synthesized by polymerization from its monomer isoprene. Natural rubber possesses many excellent physical properties including high resilience and strength, good abrasion resistance. The defects are like SBR, having poor resistant to hydrocarbon oil and not suitable in UV, oxygen and ozone because of the double bond in the polymer backbone. Its poor weathering resistance can be modified by special additive.

Service Temperature

For NR, the service temperature can be designed from -50° C to 70° C, and can tolerate service temperatures up to 100° C with a shortened lifetime.

Hardness

40 to 90 Shore A are available.

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Ethylene/Acrylic (AEM)

Ethylene/acrylic elastomer is a copolymer of ethylene and methyl acrylate, plus a small amount of a cure site monomer containing carboxylic acid groups. AEM is a tough, low-compression-set rubber with excellent resistance to high temperatures, hot mineral oil, fluids and weathering. The low temperature flexibility and mechanical properties are better than ACM, but it is not well resistant to low aniline oil (like ASTM No. 3 oil) and polar solvents.

Service Temperature

The service temperature of standard AEM is -30° C to 150° C.  However, it can tolerate service temperatures up to 175° C with a shortened lifetime.

Hardness

40 to 85 Shore A are available.

Color

AEM is available in black and orange.

Application

AEM is typically chosen for applications requiring improved performance versus nitrile rubber, neoprene, or reduced-cost versus higher-end elastomers such as HNBR and FKM. It also usually is applied in automatic and automotive industries.

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