Derivative of butyl rubber which has been reacted with chlorine in a continuous process
Benefits
Low gas permeability Excellent ozone resistance Good steam resistance Good fire resistance.
Limitations
Poor resistance to oils and non-polar solvents .
Service Temperature °C
-50 to 120°C
Applications / Products
Inner tyre tubes, breathing apparatus for defence and fire services, Dampers.
HNBR
GB GUMMI Ref:
GBH
ASTM Classification:
HNBR
FULL FORM OF RM/Rubber
Hydrogenated (≥ 90% saturation) version of acrylonitrile-butadiene rubber, which shows improved stability and physical properties compared to standard NBR
Benefits
Good resistance to oils and non-polar solvents High tensile strength Good ozone and weathering resistance Good abrasion resistance Excellent heat resistance.
Limitations
Decreased low temperature flexibility compared to NBR Poor steam resistance.
Service Temperature °C
-25 to 170°C
Applications / Products
Oil & gas industry.
FVMQ
GB GUMMI Ref:
GBV
ASTM Classification:
FVMQ
FULL FORM OF RM/Rubber
Copolymer of fluorovinyl and methyl siloxane
Benefits
Excellent resistance to high and low temperatures Excellent ozone resistance Excellent compression set resistance Good resistance to oils and most non-polar solvents.
Limitations
Poor tensile strength and abrasion resistance.
Service Temperature °C
-60 to 200°C
Applications / Products
Food and medical applications, aircraft fuel systems.
VMQ
GB GUMMI Ref:
GBV
ASTM Classification:
VMQ
FULL FORM OF RM/Rubber
Polydimethylsiloxane containing vinyl (VMQ)
Benefits
Excellent resistance to high and low temperatures.
Limitations
Poor tensile strength Poor resistance to oils and non-polar solvents.
Service Temperature °C
-60 to 225°C
Applications / Products
Food and medical applications.
ECO
GB GUMMI Ref:
GBD
ASTM Classification:
ECO
FULL FORM OF RM/Rubber
Polymers based on polyepichlorohydrin which may also contain ethylene oxide and allyl glycidyl ether
Benefits
Excellent ozone resistance Good resistance to oils .Fire resistance.
Limitations
Poor resistance to some non-polar solvents Poor steam resistance.
Service Temperature °C
-35 to 125°C
Applications / Products
Seals, gaskets, diaphragms, cable jackets and belting.
AEM
GB GUMMI Ref:
ASTM Classification:
AEM
FULL FORM OF RM/Rubber
Copolymer of ethylene and acrylate
Benefits
Excellent resistance to transmission fluids, water, glycol mixtures and weak bases Good dynamic properties over a wide temperature range Excellent vibration dampening Excellent ozone resistance Can be formulated for low flammability / low smoke specifications.
Limitations
Poor steam resistance Poor resistance to brake fluid and phosphate esters.
Service Temperature °C
-40 to 175°C
Applications / Products
Automotive sealing applications, including seals for transmission and power steering systems.
CR
GB GUMMI Ref:
GBC
ASTM Classification:
CR
FULL FORM OF RM/Rubber
Polychloroprene rubber
Benefits
High tensile strength and resilience Excellent ozone and weathering resistance Good resistance to oils.
Limitations
Poor resistance to some non-polar solvents Poor steam resistance.
Service Temperature °C
-40 to 125°C
Applications / Products
General purpose seals and hoses; seals for refrigeration industry applications.
NBR-PVC
GB GUMMI Ref:
GBP
ASTM Classification:
NBR PVC
FULL FORM OF RM/Rubber
Blend of polyvinyl chloride and acrylonitrile butadiene rubber.
Benefits
Good resistance to oils. Improved ozone resistance compared to NBR.
