NATURAL RUBBER (NR)

 

Natural rubber is a product coagulated from the latex of the rubber tree, hevea brasiliensis. Natural rubber features excellent compression set, high tensile strength, resilience, abrasion and tear resistance, good friction characteristics, excellent bonding capabilities to metal substrate, and good vibration dampening characteristics.

 

Material advantages:

 

» excellence compression set

» good resilience and abrasion

» good surface friction properties

 

Material disadvantages:

 

» poor resistance to attack by petroleum oils

» poor resistance to ozone and UV ray

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SILICONE (Si)

 

Silicone is a semi-organic elastomer with outstanding resistance to extremes of temperature with corresponding resistance to compression set and retention of flexibility. Silicone elastomers provide excellent resistance to ozone, oxygen, and moisture.

It grant high abrasion resistance that, combined with high friction properties limit, makes it excellent in static seal applications.

Silicone utilizes a flexible siloxane backbone rather than a carbon backbone like many other elastomers and has very low glass transition temperatures.

 

Material advantages:

 

» excellent extreme temperature properties

» excellent compression set resistance

» Hygienic, neutral  odor and taste

 

Material disadvantages:

 

» typically not good for dynamic seals due to friction properties and poor abrasion resistance

» higher price than other rubber compounds

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FLUOROSILICONE (FSi)

 

Fluorosilicones combine most of the attributes of silicone with resistance to petroleum oils and hydrocarbon fuels.

Low  abrasion resistance but high adhesion limit to surfaces. Fluorosilicones are used primarily in aircraft fuel systems.

 

Material advantages:

 

» excellent extreme temperature properties

» excellent compression set resistance

» Hygienic, neutral  odor and taste

 

Material disadvantages:

 

» typically not good for dynamic seals due to friction properties and poor abrasion resistance

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BUTYL (IIR)

 

The distinctive properties of IIR rubber materials are very low gas and moisture permeability, excellent insulating properties, good ozone and weathering resistance, and resistance to a great many organic and inorganic media. IIR elastomer materials can be polymerised with various halogens (e.g. Chlorine / Bromine) to improve resistance to certain chemical media, but at the expense of electrical insulation and moisture resistance. They can be used from –40 to +120°C typically, and are mostly used in the production of tyre inner tubes, seals and gaskets, vacuum seals and membranes, and pharmaceutical goods.

 

Material advantages:

 

» excellent ozone resistance

» excellent water resistance

 

Material disadvantages:

 

» poor oil resistance

» poor flame resistance

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EPICHLOROHYDRIN (ECO)

 

ECO is generally resistance to high temperatures, oils, ozone, and flame with gas resistance comparable to NBR’s. The temperature range for continuous use is –40 to +120°C, but are generally unsuitable for rubber to metal bonding (they are corrosive to metals). ECO elastomers are suitable for use in seals, gaskets, diaphragms, cable jackets, belting etc, for a wide range of media. However, they are unsuitable for use with ketones and esters, alcohols, phosphate ester hydraulic fluids, sour gas, water and steam.

 

Material advantages:

 

» excellent oil resistance

» good ozone resistance

» good compression set

 

Material disadvantages:

 

» poor abrasion resistance

» poor water resistance

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POLYETHYLENE (CSM)

 

Chlorosulfonated polyethylene or CSM is a synthetic rubber based on polyethylene. This rubber is a material with Neoprene Polychloroprene plus other qualities.

Chlorosulfonated polyethylene is known for its excellent resistance to atmospheric conditions and good resistance to chemicals. Chlorosulfonated polyethylene is used in a variety of industrial and automotive applications that require high performance and have to withstand extreme weather conditions.

 

Material advantages:

 

» excellent oil resistance

» abrasion resistance

» good water resistance

 

Material disadvantages:

 

» poor fuel resistance and poor compression set

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ETHYLENE-PROPYLENE (EPDM)

 

Ethylene-propylene compounds are prepared from ethylene and propylene (EPM) and usually a third monomer (EPDM). These compounds are used frequently to seal in brake systems, and for sealing hot water and steam. Ethylene propylene compounds have good resistance to mild acids, detergents, alkalis, silicone oils and greases, ketones, and alcohols. They are not recommended for applications with petroleum oils, mineral oil, di-ester lubricants, or fuel exposure.

EPDM compounds are typically developed with a sulfur or peroxide cure system.

 

Material advantages:

 

» excellent weather resistance

» good low temperature flexibility

» excellent chemical resistance

» good heat resistance

 

Material disadvantages:

 

» poor petroleum oil and solvent resistance

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HYDROGENATED NITRILE (HNBR)

 

HNBR is created by partially or fully hydrogenating NBR. The hydrogenating process saturates the polymeric chain with accompanying improvements to the ozone, heat and aging resistance of the elastomer and improves overall mechanical properties.

HNBR, like Nitrile, increasing the acrylonitrile content increase resistance to heat and petroleum based oils and fuels, but decreases the low temperature performance.

 

Material advantages:

 

» excellent heat and oil resistance

» improved fuel and ozone resistance (approximately 5X) over Nitrile

» abrasion resistance

 

Material disadvantages:

 

» decreased elasticity at low temperatures with hydrogenation over standard nitrile

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NITRILE (NBR)

 

The popularity of nitrile is due to its excellent resistance to petroleum products and its ability to be compounded for service over a temperature range of  -30°C a 100°C.

Nitrile is a copolymer of butadiene and acrylonitrile. Variation in proportions of these polymers is possible to accommodate specific requirements. An increase in Acrylonitrile content increases resistance to heat plus petroleum base oils and fuels but decreases low temperature flexibility.

Nitrile provides excellent compression set, tear, and abrasion resistance. The major limiting properties of Nitrile are its poor ozone and weather resistance and moderate heat resistance, but in many application these are not limiting factors.

 

Material advantages:

 

» excellent compression set

» superior tear resistance

» abrasion resistance

 

Material disadvantages:

 

» poor weather resistance

» moderate heat resistance

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POLYACRYLATE (ACM)

 

Polyacrylates are copolymers of ethyl and acrylates which exhibit excellent resistance to petroleum fuels and oils and can retain their properties when sealing petroleum oils at continuous high temperatures up to 150°C. These properties make polyacrylates suitable for use in automotive automatic transmissions, steering systems, and other applications where petroleum and high temperature resistance are required.

Polyacrylates also exhibit resistance to cracking when exposed to ozone and sunlight.

Polyacrylates are not recommended for applications where the elastomer will be exposed to brake fluids, chlorinated hydrocarbons, alcohol, or glycols.

 

Material advantages:

 

» petroleum fuel and oil resistance

» good ozone resistance

» good heat resistance

 

Material disadvantages:

 

» fair compression set performance relative to NBR

» water resistance and low temperature performance

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NEOPRENE / CHLOROPRENE (CR)

 

Neoprene homopolymer of chlorobutadiene and is unusual in that it is moderately resistant to both petroleum oils and weather (ozone, UV, oxygen). This qualifies neoprene uniquely for certain sealing applications where many other materials would not be satisfactory. Neoprene is classified as a general purpose elastomer which has relatively low compression set, good resilience and abrasion.

Neoprene has excellent adhesion qualities to metals for rubber to metal bonding applications.

It is used extensively for sealing refrigeration fluids and ammonia.

 

Material advantages:

 

» moderate resistance to petroleum oils

» good resistance to ozone, UV, oxygen

» excellence resistance to refrigeration fluids and ammonia

 

Material disadvantages:

 

» moderate water resistance

» not effective in solvents environments

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FLUOROCARBON (FPM)

 

Fluorocarbon exhibits resistance to a broader range of chemicals combined with very good high temperature properties more so than any of the other elastomers.

Fluorocarbons are highly resistant to swelling when exposed to gasoline as well as resistant to degradation due to expose to UV light and ozone. When exposed to low temperatures, fluorocarbon elastomers can become quite hard.

Fluorocarbons exhibit low gas permeability making them well suited for hard vacuum service and many formulations are self-extinguishing. FKM materials are not generally recommended for exposure to hot water, steam, low molecular weight esters and ethers, glycol based brake fluids, or hot hydrofluoric or chlorosulfonic acids.

 

Material advantages:

 

» excellent chemical resistance

» excellent heat resistance

» good mechanical properties

» good compression set resistance

 

Material disadvantages:

 

» poor low temperature flexibility

» poor resistance to hot water and steam

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POLYURETHANE (AU) (EU)

 

Millable polyurethane exhibits excellent abrasion resistance and tensile strength as compared to other elastomers providing superior performance in hydraulic applications with high pressures.

Fluid compatibility is similar to that of nitrile at temperatures up to approximately 80 °C. At higher temperatures, polyurethane has a tendency to soften and lose both strength and fluid resistance.

 

Material advantages:

 

» excellent strength and abrasion resistance

» good resistance to petroleum oils

» good weather resistance

 

Application Disadvantages

 

» poor resistance to water

» poor high temperature capabilities

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STYRENE BUTADIENE (SBR)

 

Styrene Butadiene (SBR) is a copolymer of styrene and butadiene, has properties similar to those of natural rubber. SBR is used in hydraulic brakes system seals and diaphragms, with the major of the industry usage coming from the Tire Industry. SBR features excellent resistance to brake fluids, and good water resistance.

 

Material advantages:

 

» good resistance to brake fluids

» good resistance to water

 

Application Disadvantages

 

» poor weather resistance

» poor petroleum oil and solvent resistance

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ETHYLENE ACRYLIC (AEM)

 

It exhibits properties similar to those of Polyacrylate, but with extended low temperature range and with enhanced mechanical properties.

Ethylene-acrylic offers a high degree of oil, ozone, UV and weather resistance.

 

Material advantages:

 

» excellent vibration dampening

» excellent heat aging characteristics

» good dynamic property retention over a wide temperature range

» resistance to transmission fluids, water, glycol mixtures, and alkalies

 

Application Disadvantages

 

» not recommended for exposure to fuel, brake fluid, aromatic hydrocarbons or phosphate esters.

 

 

 

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Tabella Proprietà Elastomeri

Di seguito vi presentiamo la tabella delle proprietà dei singoli elastomeri: 
-durezza standard
-colori
-temperature
-resistenza a varie sostanze 
 

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