Rubber Seals & O Rings

Viton Rubber for H2S/Sour Service

ARES, Viton® is better able to withstand high temperature, while simultaneously retaining its good mechanical properties. Oil and chemical resistance are also essentially unaffected by elevated temperatures. Compounds of Viton® remain substantially elastic when exposed to laboratory air oven ageing up to 204°C or to intermittent exposures up to 316°C. Viton® grades also resist degradation from a wider variety of chemicals and fluids – including oils, fuels, lubricants and most mineral acids – than any other non-fluorinated elastomer. In layman’s terms, that means it provides the best fluid resistance of any commercial rubber. With its low permeability to such a broad range of substances, Viton® is known to deliver exceptionally good performance in oxygenated automotive fuels. The rugged characteristics Viton® don’t stop there however. Because they also display good resistance to compression, even at temperatures that would make other non-fluorinated elastomers brittle. It is also especially resistant to atmospheric oxidation, sun, climatic conditions, fungus and mould. Furthermore, Viton® has good electrical properties (in low voltage, low frequency applications) and low burning characteristics.

Viton® tubing is also commonly used in automotive, and other transportation fuel applications, involving high concentrations of biodiesel. Types B and F (FKM- GBL-S and FKM-GF-S) have been proven to be more resistant to acidic biodiesel because this type of fuel is unstable and oxidising

Nitrile Rubber for STD Service

ARES, Nitrile (also known as NBR rubber and Buna-N) is the seal industry’s most widely used and economical elastomer. This is partly because it displays excellent resistance to petroleum-based oils, fuels, water, alcohols, silicone greases, hydraulic fluids. However, it also has a good balance of desirable working properties like low compression set, high abrasion resistance and high tensile strength.

Nitrile is a family of unsaturated copolymers of 2-propenenitrile and butadiene monomers (1,2-butadiene and 1,3-butadiene). Its physical and chemical properties vary depending on the polymer’s composition of nitrile. The more nitrile there is within the polymer, the higher its resistance to oils but the lower its flexibility. Nitrile rubber is more resistant than natural rubber to oils and acids, and has superior strength, but suffers from inferior flexibility.

Nitrile offers the following advantages:

  • Excellent abrasion resistance.
  • Good rebound.
  • Good tear resistance.
  • Good non-polar solvent resistance.
  • Good water resistance.
  • Good oil resistance.
  • Cheaper than fluor elastomers