The Science Behind Natural Rubber Vulcanization
The Science Behind Natural Rubber Vulcanization Read Post »
| GB GUMMI Ref: | GBK | |
|---|---|---|
| ASTM Classification: | CIIR | |
| FULL FORM OF RM/Rubber | 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. | |
| 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. | |
| 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. | |
| 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. | |
| 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. | |
| 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. | |
| 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. | |
| 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. | |
| Limitations | Poor weathering resistance. Poor steam resistance. | |
| Service Temperature °C | -40 to 100°C | |
| Applications / Products | Oil resistant seals that may be exposed to daylight or other forms of radiation. | |
| GB GUMMI Ref: | GBA | |
|---|---|---|
| ASTM Classification: | ACM | |
| FULL FORM OF RM/Rubber | Copolymer of ethyl and butyl acrylate | |
| Benefits | Excellent resistance to petroleum fuel and oil Good heat resistance Good ozone resistance Resists flex cracking. | |
| Limitations | Moderate water resistance. | |
| Service Temperature °C | -60 to 175°C | |
| Applications / Products | Automotive sealing applications, including seals for transmission and power steering systems. | |
| GB GUMMI Ref: | GBE | |
|---|---|---|
| ASTM Classification: | EPDM | |
| FULL FORM OF RM/Rubber | Terpolymer of ethylene, propylene and a diene cure site monomer (EPDM) | |
| Benefits | Excellent steam resistance. Excellent ozone and weathering resistance Good low temperature flexibility. | |
| Limitations | Poor resistance to oils and non-polar solvents. | |
| Service Temperature °C | -55 to 150°C | |
| Applications / Products | O-rings, seals and components for potable water seals, taps etc, brake systems, automotive cooling systems, nuclear cooling systems, outdoor exposure applications. | |
| GB GUMMI Ref: | GBF | |
|---|---|---|
| ASTM Classification: | FKM | |
| FULL FORM OF RM/Rubber | fluorocarbon copolymers based on vinylidene fluoride and hexapropylene fluoride | |
| Benefits | Excellent high temperature resistance Good resistance to oils and most non-polar solvents Excellent ozone and weathering resistance. | |
| Limitations | Limited steam resistance Poor resistance to methanol. Poor low temperature performance. | |
| Service Temperature °C | -20 to 240°C | |
| Applications / Products | General purpose seals for aerospace fuel and automotive applications. | |
| GB GUMMI Ref: | GBB | |
|---|---|---|
| ASTM Classification: | NBR | |
| FULL FORM OF RM/Rubber | Nitrile Butadiene Rubber | |
| Benefits | Good resistance to oils and non-polar solvents. | |
| Limitations | Poor ozone and weathering resistance. Poor steam resistance. | |
| Service Temperature °C | -40 to 120°C | |
| Applications / Products | Oil resistant applications in automotive, marine and aircraft fuel systems. | |
| GB GUMMI Ref: | GBS | |
|---|---|---|
| ASTM Classification: | SBR | |
| FULL FORM OF RM/Rubber | Styrene Butadiene Rubber | |
| Benefits | Good Tensile Properties, Good brake oil resistance. | |
| Limitations | Poor resistance to oils and non-polar solvents, Poor steam resistance, Poor ozone and weathering resistance. | |
| Service Temperature °C | -25 to 100°C | |
| Applications / Products | Damper, Isolator Mount, NR+SBR Blend parts, Brake seals. | |
| GB GUMMI Ref: | GBN | |
|---|---|---|
| ASTM Classification: | NR | |
| FULL FORM OF RM/Rubber | Natural Rubber | |
| Benefits | High Tensile Properties, Better Abrasion resistance, Good Resilience properties | |
| Limitations | Poor resistance to oils and fuels, inferior weather resistance. | |
| Service Temperature °C | -30 to 60°C | |
| Applications / Products | Suspension Mounts, Damper, Bushing, Bump Stop, Diaphragm, Isolator Mount, Food Grade Seals, V BELTS, etc. | |