Elastomers

The rubber materials are polymers, which are formed by cross-linked macromolecules with various vulcanization additives. Due to their chemical bonds they do not melt and they begin to decompose at high temperatures. In addition the cross-link ensures that rubber materials do not dissolve, and depending on the medium, do suffer more or less intensive swell or shrinkage. Elastomers have in general inferior mechanical properties compared to polyurethanes. However the different elastomers display other qualities such as chemical and temperature resistance combined with elasticity, and are widely used for different types of seals.

Oil & gas: We have listed some rubbers opimized for use in the oil & gas industry in a separate section

RU1™

RU1 is an elastomer based on acrylonitrile-butadiene rubber, often referred to as NBR or nitrile rubber. This material has a good resistance to mineral oils and greases and HFA, HFB and HFC pressure fluids. However, the material is not resistant to glycol-based brake fluids, HFD fluids, aromatic fluids (such as benzene), esters, ketones and amines or concentrated acids and bases. RU1 is also available in a low-temperature grade, with a minimum working temperature of – 50ºC. Temperature range from -30 ºC to 100 ºC.

RU2™

RU2 is an elastomer based on fluororubber, VITON® (registered trade name of Du Pont), with similar properties as VITON® type B. This material is also referred to as FKM (ISO). RU2 has high resistance against heat, weathering, ozone and many chemical ingredients. RU2 is compatible with mineral oils and greases containing sulphur, HFD pressure fluids (nearly all phosphate esters and chlorinated hydrocarbons), crude oil and sour gas. RU2 shows excellent resistance against explosive decompression (ED). RU2 is not resistant against anhydrous ammonia, amines, ketones, esters, hot water and low molecular weight organic acids. RU2 is also available in a FDA compliant grade and with different hardness (75º-95º shore A). Temperature range from -20 ºC to 200 ºC.

RU3™

RU3 is a perox-cured elastomer based on ethylene-propylene rubber, often referred to as EPDM. RU3 has an outstanding stability against hot water, steam, washing agents, polar organic solvents and glycol based brake fluids. RU3 is not resistant against mineral oil and other unpolar media. The stability to weathering, ozone and ageing is good. RU3 is also available in a FDA compliant grade and a hard grade (93 º shore A). Temperature range from -50 ºC to 150 ºC.

RU4™

RU4 is a hydrogenated or saturated acrylonitrile-butadiene rubber, often referred to as H-NBR. RU4 is suitable for applications in aliphatic hydrocarbons like propane or butane and mineral oils and greases (for short times up to 170°C) and also for sulfonated crude oil. Furthermore, it can be used in many diluted acids and bases and salt solutions even at elevated temperatures and in glycol-water mixtures. RU4 is not compatible with fuels with a high content of aromatic hydrocarbons (premium blend petrol), gasolines (petrol / alcohol blends) ketones, esters, ethers and chlorinated hydrocarbons like trichloroethylene and tetrachloroethylene. RU4 complies with FDA-recommendations. RU4 is also available in hard grade (93ºshore A), ED-grade, low-temperature grade (-40ºC) and ED/low-temperature grade (-30ºC). Temperature range from -25 ºC to 150 ºC.

RU5™

RU5 is a silicone rubber, or VMQ. Owing to the poor mechanical properties, which are noticeably lower in comparison to other rubbers, RU5 is mostly used for static (non-moving) applications. RU5 is highly resistant against weathering, ozone and ageing, and also has a wide temperature range (-60 to 200 ºC). The compatibility with mineral oils depends on the content of aromatic hydrocarbons in the oil. RU5 complies with FDA-recommendations. Temperature range from -60 ºC to 200 ºC.

RU6™

RU6 is a tetraflourethylene-propylene material, often referred to as Aflas® (registered trade name of Asahi Glass), FEPM or TFE/P. This material is well suited against HFA, HFB, HFC and HFD liquids. In addition this material has excellent resistance against steam and hot water. Good resistance against various chemicals, and good mechanical properties means this material will often improve overall sealing effect in many systems currently using Viton® /FKM-materials or Perfluour/FFKM-materials. Temperature range from -10 ºC to 200 ºC.

 

Oil & gas: We have listed some rubbers opimized for use in the oil & gas industry in a separate section

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