Rubber Compounds

Selecting the proper compound is the first step in designing a seal for your application. Operating temperature range, fluid contact, type of seal whether static or dynamic are some of the criteria you must consider when selecting a compound. There are 36 different types of elastomer compounds available to select from and majority of those have several different grades and types. Below is a list of the more common elastomers with their general uses and temperature range.

Common Name

ASTM D1418 Designation

Chemical Name

Uses

NBR

Acrylonitrile-Butadiene

-40°F to 212°F/250°F intermittent, Good with oils, solvents, water, hydraulic fluids. Good compression set, tensile strength and abrasion resistance.

EPDM, EPM

Ethylene Propylene Diene Monomer, Ethylene Propylene Monomer

-55°F to 250°F, Exceptionally good weather aging and ozone resistance. Excellent water and chemical resistance, gas permeability and aging due to exposure to steam. Good in ketones and alcohols.

Viton®

FKM

Fluorocarbon

-15°F to 400°F, Excellent weathering, ozone and heat resistance. Resistance to wide range of oils and solvents, specially all aliphatic, aromatic and halogenated hydrocarbons, acids, animal and vegetable oils.

VMQ

Silicone (not to be confused with the element Silicon)

-65°F to 450°F, Excellent heat resistance and extreme low temperature properties. Low compression set and good resilience. Moderate solvent resistance. Good release characteristics.

Fluorosilicone

FVMQ

Fluorosilicone

-100°F to 350°F, Excellent weathering, ozone and heat resistance. Good for special applications where general resistance to oxidizing chemicals, aromatic and chlorinated solvent bases are required.

CR

Chloroprene

-40°F to 250°F, Good weather and ozone resistance. High resilience with low compression set. Flame resistance. Animal and Vegetable oil resistance.

Hydrogenated Nitrile, HSN

HNBR

Hydrogenated Acrylonitrile-Butadiene

-65°F to 300°F, Excellent weather resistance. Good resistance to ozone. Better wear resistance than standard Nitrile. Excellent abrasion, compression set, tensile strength and tear properties. Good resistance to heat aging up to 300°F and for short periods up to 350°F. Generally used for Laundry, dish washing detergents and air conditioning refrigerant.

Styrene Butadiene, SBR

SBR

Styrene Butadiene

0°F to 225°F, Low cost non-oil resistant material. Good water resistance and resilience up to 70 durometer. Satisfactory for most moderate chemical and wet or dry organic acids.

Natural Rubber

NR

cis-polyisoprene

-76°F to 212°F, Can be compounded to maintain good flexibility to -76°F. Low cost. Outstanding strength, low fatigue. Good creep and stress relaxation resistance.

Isoprene

IR

cis-polyisoprene, synthetic

Essentially the same as natural rubber except it may be weaker.

Butyl

IIR

Isobutene-Isoprene

-50°F to 250°F, Excellent weather, ozone, heat and chemical resistance. Excellent impermeability to gases.

Aflas®

FEPM

Tetrafluoroethylene-Propylene (TFE/P)

-5°F to 445°F, Excellent heat resistance up to 445°F. Good chemical resistance including strong acids and bases. Excellent oil resistance and electrical resistivity.

Polyurethane

AU, EU

Polyester-urethane, polyether-Urethane

-60°F to 180°F, Extreme abrasion and extrusion resistance. Used in high pressure applications up to 5000psi. Good weathering and ozone resistance. High tear and wear resistance. Good for hydrocarbon fuels, mineral oils, CO2.

Kalrez®
Simriz®
Chemraz®

FFKM

Perfluoroelastomer

+600°F, Highest heat resistance, Excellent chemical, plasma resistance. Excellent compression set resistance.

Viton® and Neoprene® are registered trademarks of DuPont Dow Elastomers.
AFLAS® is a registered trademark of the Asahi Glass Co., Ltd.
Kalrez® registered trademarks of E. I. du Pont de Numours and Company.
Simriz® registered trademarks of Freudenburg-NOK.
Chemraz® registered trademarks of Green Tweed.