Silicone (VMQ) rubber contains methyl and vinyl groups attached to the main silicone chain. Silicone O-rings are characterized by excellent resistance to temperature extremes and thermal cycling. Silicone rubber compound does not impart odor or taste, which makes it suitable for many food and pharmaceutical applications.
Silicone rubber however, has poor mechanical properties as compared to other elastomers and for this reason silicone O-rings are generally not used in dynamic applications. It is not suitable for use with silicone O-ring lubrication, PTFE alternatives should be used instead. Features of silicone rubber O rings are:
Recommended temperature range -20°C to +180°C
High – aniline point oils
Chlorinated DI – phenyls
Food processing applications
Excellent ozone resistance.
Our Viton O-rings have excellent chemical resistance and can be used at temperature range of between 15°C and 200°C. Although generally more expensive than NBR (Nitrile) O-rings, but Viton rubber components has found wide acceptance in the aircraft, automotive and chemical industries. Features of Viton O rings are:
Recommended temperature range -10°C to +180°C
Mineral oil and grease, ASTM oil No. 1, and IRM 902 and IRM 903 oils
Non-flammable hydraulic fluids (HFD)
Aliphatic hydrocarbons (butane, propane, natural gas)
Aromatic hydrocarbons (benzene, toluene)
Chlorinated hydrocarbons (trichloroethylene and carbon tetrachloride)
Gasoline (including high alcohol content)
Very good ozone, weather and aging resistance
Not compatible with:
Glycol based brake fluids
Ammonia gas, amines, alkalis
Low molecular weight organic acids (formic and acetic acids)
Nitrile rubber possess superior mechanical properties and enhanced fluid compatibility.
- Improved high temperature resistance.
- Enhanced wear and abrasion resistance.
- Specific compounds are explosive decompression resistant
- Ozone resistant
- Improved chemical compatibility with several aggressive fluid medias
- Improved compression set resistance