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$34.00
Availability: 1 In Stock
Product Code: VOR-V-KF25X

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O-Rings for NW/KF Centring Rings

Depending on 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°C to 250°C. Viton ; is a registered trademark of DuPont Performance Elastomers.

Silicone is a popular O-Ring which 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°C to 232°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°C to 150°C. Excellent resistance to petroleum-based oils and fuels, water and alcohols. 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°C
-54°C
-85°C
Maximum Usable Temperature
150°C
260°C
232°C
Color
Black
Black / Brown
Red
Impermeability
Fair
Good
Poor
Tensile Strength
Good
Good
Poor
Cost
Low
High
Medium
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