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Depending on the pressure on the O-ring, environment and service temperature, O-rings need to be renewed to ensure leak-free seals. Use the O-rings to service the NW/KF connections on your vacuum systems.
Viton is well known for its excellent resistance to heat and to aggressive fuels and chemicals. Used for high vacuum applications, temperature range from -54 deg. C to 250 deg. C. Viton is a registered trademark of DuPont Performance Elastomers.
Silicone is a popular O-Ring material that is commonly red in colour and is used for chemical applications. Made of elastomeric materials made from silicone, oxygen, hydrogen and carbon. Excellent material for static service at extreme (hot or cold) temperatures. Outstanding flex and fatigue life. Very good for ozone and UV radiation as well as for resistance to fungal and biological attack. Limitations: Avoid chlorinated solvents, aliphatic and aromatic hydrocarbons and petroleum oils. Silicones are generally very permeable to gases and have poor physical strength and abrasion resistance. Temperature Range from -85 deg. C to 232 deg. C. LPCVD/Oxidation, Dry Etch, Resist Stripping.
Buna-N, also known as Standard Nitrile, is used for non-critical and low vacuum applications, temperature range from -54 deg. C to 150 deg. C. Excellent resistance to petroleum-based oils and fuels, water and alcohol. Nitrile also has good resistance to acids and bases, except those with a strong oxidising effect. Limitations: Avoid highly polar solvents (Acetone, MEK, etc.) and direct exposure to ozone and sunlight.
Size ID (mm) [B] OD (mm) Thickness (mm) [A] KF16 18.5 29 5 KF25 28.5 37 5 KF40 41.5 50 5 KF50 55 65 5 O-ring Materials Comparison Table Property Buna-N Viton , Silicone Common Name Nitrile Fluor Elastomere Silicone Rubber Tear Resistance Good Good Good Abrasive Resistance Good Good Poor Ozone Resistance Poor Excellent Excellent Weather Resistance Fair Excellent Excellent Heat Resistance Fair Excellent Excellent Chemical Resistance Fair Excellent Good Oil Resistance Poor Excellent Poor Acid Resistance Fair Excellent Good Alkali Resistance Good Good Fair Steam Resistance Fair Fair Poor Minimum Usable Temperature -54 deg. C -54 deg. C -85 deg. C Maximum Usable Temperature 150 deg. C 260 deg. C 232 deg. C Color Black Black / Brown Red Impermeability Fair Good Poor Tensile Strength Good Good Poor Cost Low High Medium
Технические характеристики
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