Molded Rubber Parts catalog

Molded Rubber Seal Elastomer Types

A very important component of a seal is the elastomer type. GBSA can specially compound elastomers for specific sealing requirements. Below we provide general properties and fluid compatibilities.

ELASTOMER TYPE
HARDNESS
SHORE A
GENERAL PROPERTIES
NITRILE (NBR)
Acrylonitrile Butadiene
35 to 95
Low, medium and high nitriles are available based on increasing acrylonitrile content which significantly affects low temperature and fluid swell properties. Nitrile compounds can exhibit very good tear and abrasion resistance and excellent compression set. Unless specifically compounded, they do not have a good resistance to ozone, sunlight or weather.
THERBAN (HNBR)
Hydrogenated Acrylonitrile Butadiene
55 to 75
This material is a hydrogenated acrylonitrile butadiene and unlike standard nitriles it exhibits resistance to the ozone and other atmospheric conditions. Therban also exhibits a very good resistance to heat and aging in the 300°F range and refrigeration. All other properties are NBR.
FLUOROCARBON (FPM)
Fluorinated Hydrocarbon
55 to 93
This polymer exhibits very good resistance to petroleum products, low compression set and high temperature resistance.
NEOPRENE (CR)
Chloroprene
40 to 70
Compounds from neoprene exhibit good ozone and weather resistance. Due to the excellent resistance to refrigerants such as Freon, these compounds are used in refrigeration systems.
ETHYLENE PROPYLENE
(EPDM)
(EPM)
35 TO 85
30 TO 80
Compounds of this material exhibit excellent resistance to automotive brake fluids and steam as well as ozone, sunlight and weather.
SILICONE (VMQ) Silicone compounds are noted for their excellent heat resistance and exhibit the best over all temperature range of all available elastomers. Not recommended for dynamic applications.
FLUOROSILICONE (FMQ)
35 TO 80
This polymer is used in aerospace and automotive applications for fuel systems. It substitutes FPM where low temperature resistance is required.
POLYACRYLATE (ACM)
60 TO 80
Due to the excellent resistance to automotive transmission fluid, oil, flex, and oxidation cracking, this material is used in power steering and transmission applications.

Material and Temperature

molded rubber material temperature