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PROPERTIES OF COMMON RUBBER ELASTOMERS
VITON/FKM (FLOROCARBON RUBBER)
  FKM's are serviceable in continuous heat of up to 250℃ and intermittent heat of up to 300℃.
  Satisfactory resistance to low temperatures of typically -20℃ and - 40℃ by use of special grades.
  FKM's exhibit good flame resistance and are usually self extinguishing upon removal of flame source.
  All FKM's have excellent resistance to oxygen, ozone and natural weathering.
  FKM compounds have outstanding resistance to compression, especially at elevated temperatures.
  Resistance to chemicals; amongst all synthetic rubbers FKM's are the most resistant to many of the solvents and chemicals, giving long 
  service where other materials do not.
  Excellent resistance against hydrocarbons, aliphatics, aromatic and chlorinated chemicals.
  Good resistance to acids and alkali's including oxidants. Poor performance against ethers, ketones, and bases.

Ethylene-Propylene (EPDM) (EPR)

This is a polymer of ethylene, propylene and a diene monomer. It has outstanding resistance to oxygen, ozone, and sunlight. Its resistance to polar International Standards such as phosphate esters, many ketones and alcohol. It has good electrical properties, low temperature flexibility, excellent heat,
water and steam resistance. Its resistance to petroleum products is poor. Useful temperature range is -58o F to +300o F (-50℃ to +150℃).

Nitrile / Buna-N (NBR)

This is a copolymer of acrylonitrile and butadiene. It has excellent physical properties, however its claim to fame is based on its resistance to water, petroleum products and fuels. When compounded properly, it has good low temperature properties as well as good heat resistance. It does not have good ozone, oxygen or sunlight resistance without the addition of special additives. Useful temperature range is -40o F to +275o F (-40℃ to +135℃).

Neoprene / Chloroprene (CR)

This elastomer is made by the polymerization of Chloroprene. It has excellent physical properties. It is moderately resistant to petroleum products, sunlight, ozone and heat. It is flame resistant and will not support combustion. Useful temperature range is -40o F to +275o F (-40℃ to +135℃).

Silicone

Silicone is made from sand and alkyl or aryl halides. It is predominately inorganic International Standards. It has outstanding resistance to temperature extremes. It has excellent vibration damping, and reasonable physical properties such as tensile and elongation. Tear and abrasion resistance are generally poor.
Useful temperature range is -148o F to +600o F (-100℃ to +315℃).

Natural Rubber (NR) (Gum)

As the name would indicate, this elastomer occurs naturally and comes from the latex of certain trees and plants. After the latex is processed, it becomes an elastomer with excellent mechanical properties. It has excellent tensile, elongation, tear resistance and resilience. It has good abrasion resistance and excellent low temperature flexibility. Without special additives, it has poor resistance to ozone, oxygen, sunlight and heat. It has poor resistance to solvents and petroleum products. Useful temperature range is -67o F to +180o F (-20℃ to +82℃).

Styrene Butadiene (SBR) (Buna-S)

This is a copolymer of styrene and butadiene. It has similar properties to natural rubber. Its resistance to solvents and petroleum products is about the same as natural rubber. Water resistance is better. Without special additives, it is vulnerable to ozone, oxygen and sunlight. Useful temperature range is -67o F to +180o F (-55℃ to +100℃).

Hydrogenated Nitrile (HNBR)

This polymer is produced by complete or partial hydrogenation of NBR. The result is a polymer with outstanding physical properties. It has good mechanical properties at elevated temperature. It has excellent resistance to many chemically aggressive technical oils. Its useful temperature range is -40o F to +300o F (-40℃ to +150℃).

Styrene Butadiene (SBR) (Buna-S)

Note:The information given here is very broad and should be used only as a general guide. Please contact D&A rubber Industries with information specific to your application and our technical staff will help you with International Standards selection.

D&A Rubber Industries is a up-rising company, starting its mission of manufacturing quality FKM/viton and rubber products since more than a decade. From this beginning, D&A rubber expanded into the producer of a variety of rubber profiles, ventilation duct gasket, chimney flue pipe gasket, seals for pipes and fittings, gaskets...Read More

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