FDA and Aviation Grade Rubber Material
KEF develops and formulates our rubber materials in-house. We use our extensive skills in applied material technology to give our customers a competitive advantage.
We draw from the latest material technologies and many thousands of our own rubber compounds from our material databases. Our materials group develops your material according to specification in timely manner. KEF provides FDA compliant medical grade materials, as well as aviation materials per AMS-P-5315.
Standard Rubber Materials
Natural Rubber (NR)
Chemical Structure: Polyisoprene
Mechanical properties such as the elasticity or fubber, wear and abrasion resistance are good.
Styrene-Butadiene Rubber (SBR)
Chemical Structure: Lid diene strene copolymer
Wear, abrasion, and aging resistance are better than natural rubber.
Butadiene Rubber (BR)
Chemical Structure: Polybutadiene
Elasticity is good. Wear and abrasion resistance are also superior to natural rubber.
Chloroprene Rubber (CR)
Chemical Structure: Poly chloroprene
Weatherability, ozone resistance, heat resistance, and chemical resistance, are excellent.
Isobutylene-Isoprene Rubber (IIR)
Chemical Structure: Isobutylene isoprene copolymer
Weatherability, ozone resistance, and gas-proof permeability are good, and bears a polar solvent.
Nitrile Rubber (NBR)
Chemical Structure: Butadiene-acrylonitrile copolymer
Oil, wear. abrasion, and aging resistance are good.
Ethylene-Propylene (EPM, EPMD)
Chemical Structure: Ethylene proplene copolymer
Aging resistance, ozone resistance, the resistance over a polar liquid and electric nature are good.
Acrylic Rubber (ACM ANM)
Chemical Structure: Acrylic ester copolymer
Good for high temperature oil resistance.
Urethane Rubber (U)
Chemical Structure: Polyurethane
Polyurethane excels in dynamic intensity. Polyurethane has good biocompatibility and is commonly used in biomedical devices.
Silicone Rubber (Q)
Chemical Structure: An organic polysiloxane
Silicone has excellent resistance to heat and cold. Oil resistance is also good. Silicone has very good biocompatibility, making it a preferred choice for medical device.
Fluorocarbon Rubber (FKM)
Chemical Structure: Perfluoropropene, vinylidene fluoride copolymer
This rubber material has the highest resistance to heat and cold.
|Rubber Kind||Natural Rubber (NR)||Styrene-Butadiene Rubber (SBR)||Butadiene Rubber (BR)||Chloroprene Rubber (CR)||Isobutylene-Isoprene Rubber (IIR)||Nitrile Rubber (NBR)||Ethylene-Propylene (EPM, EPMD)||Acrylic Rubber (ACM ANM)||Urethane Rubber (U)||Silicone Rubber (Q)||Fluorocarbon Rubber (FKM)|
|Specific Gravity||0.92||0.92 to 0.97||0.91 to 0.94||1.15 to 1.25||0.91 to 0.93||0.96 to 1..02||0.86 to 0.87||1.09 to 1.10||1.00 to 1.30||0.95 to 0.98||1.80 to 1.82|
|Mooney Viscosity||45 to 150||30 to 70||35 to 55||45 to 120||45 to 80||30 to 130||40 to 100||45 to 60||25 to 26 or Liquefied||Liquefied||35 to 160|
|Tensile Strength (kgf/cm^2)||30 to 350||25 to 300||25 to 200||50 to 250||50 to 200||50 to 250||50 to 200||70 to 120||200 to 450||30 to 120||70 to 200|
|Extension (%)||1000 to 100||800 to 100||800 to 100||1000 to 100||800 to 100||800 to 100||800 to 100||600 to 100||800 to 300||500 to 50||500 to 100|
|Strength of Tears||Excellent||Fair||Good||Good||Good||Good||Fair||Fair||Excellent||Poor to Fair||Good|
|Wear Resistance||Excellent||Excellent||Excellent||Good to Excellent||Good||Excellent||Good||Good||Excellent||Poor to Fair||Excellent|
|Crookedness-proof Crack Nature||Excellent||Good||Fair||Good||Excellent||Good||Good||Good||Excellent||Poor to Good||Good|
|Usable Temp (C)||-75 to 90||-60 to 120||-100 to 120||-60 to 120||-60 to 150||-30 to 130||-60 to 150||-30 to 180||-60 to 80||120 to 280||-50 to 300|
|Fire Resistance||Poor||Poor||Poor||Good||Poor||Poor to Fair||Poor||Poor to Fair||Poor to Fair||Poor to Good||Excellent|
|Electronic Insulation (ocm cm)||10^10||10^10||10^14||10^10||10^15||10^2||10^12||10^8||10^8||10^11||10^10|
|Volume Specific Resistance||~10^15||~10^15||~10^15||~10^12||~10^18||~11^11||~10^16||~10^10||~10^12||~10^16||~10^14|
|Gas Permeability||18||12||13 to 50||3||0.9 to 1.0||0.3 to 3.5||15||10||2||400||1|
|Radiation Resistance||Fair to Good||Good||Poor||Fair to Good||Poor||Fair to Good||Poor||Poor to Fair||Good||Fair to Excellent||Fair to Good|
|Gasoline and Light Oil Resistance||Poor||Poor||Poor||Good||Poor||Excellent||Poor||Excellent||Excellent||Poor to Fair||Excellent|
|Benzene, Toluene Resistance||Poor||Poor||Poor||Poor||Fair to Good||Poor to Fair||Fair||Poor||Poor to Fair||Poor to Fair||Excellent|
|Trichloroethylene Resistance||Poor||Poor||Poor||Poor||Poor||Poor||Poor||Poor||Fair to Good||Poor to Good||Good|
|Ether Resistance||Poor||Poor||Poor||Poor to Fair||Fair to Good||Poor to Fair||Good||Poor||Poor||Poor to Fair||Poor to Fair|
|Ketone (MEK) Resistance||Fair to Good||Fair to Good||Fair to Good||Fair to Good||Excellent||Poor||Excellent||Poor||Poor||Good||Poor|
|Ethyl Acetate Resistance||Poor to Fair||Poor to Fair||Poor to Fair||Poor||Excellent||Poor to Fair||Excellent||Poor||Fair||Fair to Excellent||Poor|
|Organic Acid Resistance||Poor||Poor||Poor||Poor||Fair to Good||Poor to Fair||Poor||Poor||Poor||Good||Poor|
|High Concentration Inorganic Acid Resistance||Fair||Fair||Fair||Good||Excellent||Good||Good||Fair||Poor||Fair||Excellent|
|Low Concentration Inorganic Acid Resistance||Good||Good||Good||Excellent||Excellent||Good||Excellent||Good||Fair||Good||Excellent|
|High Concentration Alkali Resistance||Good||Good||Good||Excellent||Excellent||Good||Excellent||Fair||Poor||Excellent||Poor|
Custom Rubber Materials
KEF provides over 50 years of extensive experience in rubber materials and moldings. We develop custom rubber compounds to meet complex needs.
For example, our Delta KB, KE, KF have been developed by request specifically for the hard disk industry . These materials are Non-siloxane and low outgassing compounds developed from IIR, EPDM, FKM.
Contact us to learn more.