Manufactures Cusell, S.L.



Rubbers characteristics chart


Polyisoprenes, natural (from trees) and synthetic, are noted for outstanding resilience, resistance to tear and abrasion, excellent elasticity, and flex fatigue resistance.
They also have excellent tensile strength characteristics and are operable in low temperature -65ºF (-54ºC) environments. They are not recommended for high heat, ozone, sunlight, petroleum or hydrocarbon environments.
The two isoprenes differ slightly; the purity of synthetic polyisoprene provides more consistent dynamic properties with better weather resistance. Synthetic polyisoprene’s lack of "tree" organics also gives a relatively odorless rubber.
Natural rubber, when compared to synthetic, provides slightly better properties in tensile strength, tear resistance, compression set, and flex fatigue resistance.


Polybutadiene provides excellent low temperature flexibility (-80ºF/-62ºC) and exceptionally high resilience (bounce). Resistance to abrasion, cut growth and flex cracking are also outstanding characteristics of this rubber.
It is not an oil, gasoline or hydrocarbon solvent resistant type rubber. It is however noted for outstanding low temperature, resilience and toughness characteristics.


Styrene butadiene is a low cost, general-purpose elastomer. Known as Buna-S, it was originally developed to replace natural rubber in tires. SBR exhibits very good flex fatigue resistance and is resistant to many polar type chemicals such as alcohols and ketones. It is also widely accepted for use in automotive brake fluids. SBR, however, is not resistant to petroleum based fluids.


Butyl is a common term used for the isobutylene isoprene elastomer. As the name implies, butyl is comprised of isobutylene with a small amount of isoprene. It is known for its excellent resistance to water, steam, alkalis, and oxygenated solvents. Another outstanding characteristic is low gas permeation. It is capable of providing highenergy absorption (dampening) and good hot tear strength.

Good resistance to heat, abrasion, oxygen, ozone and sunlight are dependent upon the butyl polymer saturation level. Butyl however, displays poor resistance to petroleum oil, gasoline and hydrocarbon solvents.


EPDM elastomers provide excellent resistance to heat, water, steam, ozone and UV light (color stability) while providing very good low temperature flexibility properties. These compounds also withstand the effects of brake fluids, alkali, mild acidic and oxygenated solvent environments. These compounds are not recommended for gasoline, petroleum oil and greases, and hydrocarbon solvent environments.
EPDM’s are very effective for outdoor functions requiring long term weathering properties. They are also suitable for use in hot water and steam environments and are especially suited to high temperature brake fluid applications.


Chlorosulfonated polyethylene is the base polymer for CSM synthetic rubbers.
They provide excellent ozone, oxidation, sunlight (color degradation), and weather resistance. They are also capable of providing excellent resistance to alkalis and acids.


Neoprene is a commercial name for polymers comprised of chloroprene. Polychloroprene's overall physical characteristics classify it as ageneral-purpose elastomer. Excellent aging characteristics in ozone and weather environments, along with abrasion and flex cracking resistance, justify the general-purpose categorization. Polychloroprene is alkali and acid resistant, flame retardant, and suitable for petroleum based oils. Animal and vegetable fats and greases also provide a highly stable environment for this polymer. It is noted for good compression set resistance, excellent flex fatigue resistance, and resistance to weather and ozone. Its excellent adhesion to metals makes polychloroprene ideal for molding with metal inserts.
It is not effective in aromatic and oxygenated solvent environments.


NBR, Buna-N, and nitrile all represent the same elastomer based on a butadiene and acrylonitrile copolymer. Nitrile is inherently resistant to hydraulic fluids, lubricating oils, transmission fluids and other non-polar petroleum based products due to the polar structure of this elastomer. Nitriles are also resistant to air and water environments. Using the variety of nitrile polymers and compounding ingredients, nitrile compounds to withstand environments have been derived that require low compression set, abrasion resistance, low temperature flex, gas permeation resistance, ozone resistance and/or stress-stain properties.
By hydrogenation, carboxylic acid addition, or PVC blending, the nitrile polymer can meet a broader range of physical or chemical requirements.


Years of compound development have yielded a unique material that captures the benefits of the wear resistance of carboxylated nitriles and at the same time the higher temperature resistance of the highly saturated nitrile. This formulation is called an Hydrogenated XNBR. Very high tensile strength coupled with high heat resistance and good chemical resistance to hydrogen sulfide, corrosion inhibitors, steam, and oil make this elastomer an excellent bridge between common nitriles and fluorocarbons.


HNBR has been developed to withstand continuous temperatures of up to 302ºF (150ºC) while retaining resistance to petroleum oils. Obtained by hydrogenerating the nitrile copolymer, HNBR fills the gap left by NBR and FKM elastomers when high temperature conditions require high tensile strength while maintaining excellent resistance to motor oil, ATF, sour gas, amine/oil mixtures, oxidized fuels and lubricating oils.


Polyacrylate (ACM) compounds are designed to withstand high heat while retaining oil resistance. Specially designed for sulfur bearing oil applications, ACM elastomers are suitable for high temperature, differential and bearing environments.
These elastomers are also resistant to oxidation, ozone, aliphatic solvents, sunlight, weathering and gas permeation. They are capable of withstanding high temperatures up to 1302ºF (50ºC), but their low temperature properties are relatively poor.


Fluorocarbon elastomers are highly fluorinated, carbon backboned polymers used in applications to  resist harsh chemical and ozone attack with a thermal stability to 500°F (262°C). Fluorocarbons also offer low compression set and excellent aging characteristics. They provide excellent service in oil, gasoline, hydraulic fluids, hydrocarbon solvents and extended fuels. The fluorine on the elastomer backbone provides the relative inertness of FKM elastomer. Generally speaking, with increasing fluorine content, resistance to chemical attack is improved while low temperature characteristics are diminished. There are, however, a few specialty grade fluorocarbons that can provide high fluorine content with low temperature properties.


Fluorinated silicones provide chemical properties similar to those of fluorinated organic elastomers. This property provides excellent resistance to hydrocarbon fuels, petroleum oils and silicone fluids.
Fluorosilicones provide a much wider operational temperature range than fluorocarbon (FKM) elastomers -70ºF to 400ºF (-57ºC to 205ºC). Many applications for fluorosilicones are in synthetic oils, gasoline and even extended fuels since its low temperature performance is much better than that of FKM’s.


Extreme temperature range stability and low temperature flexibility are characteristics of silicone compounds. Silicones provide outstanding resistance to compression set, sunlight, ozone, oxygen, and moisture. They are very clean and are used in many food and medical applications because they do not impart odor or taste. Silicone can be compounded to be electrically resistant, conductive or flame retardant.


Polyurethanes are noted for outstanding resistance to abrasion and tear. They provide the highest available tensile strength among all elastomers while providing good elongation characteristics. Ozone, oxidation, sunlight, weather, oil and incidental gasoline exposure are environments suited for urethane applications. Polyether based polyurethanes (EU) are directed toward low temperature flexibility applications. The polyester based polyurethanes (AU) provide improved abrasion, heat and oil swell resistance. Neither are recommended for alkalis, acids and oxygenated solvents. Polyester based polyurethanes are not typically recommended for hot water, steam and high humidity applications, but can be formulated to improve resistance to these properties.


ECO's are noted for their superior gas impermeability and physical properties over a wide temperature range -40ºF to 275ºF (-40ºC to 135ºC); while maintaining excellent resistance to petroleum oils. Ozone, oxidation, weathering, and sunlight resistance are other typical ECO/CO qualities.


Ethylene acrylic compounds provide excellent high heat aging resistance to 175ºC while providing good physical properties. A high degree of oil, ozone, UV, and weather resistance along with good low temperature flexibility are also ethylene acrylic attributes.


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