O-Ring 39mm x 4mm Butyl (IIR) 65 ShA Black -59°C to +121°C

Butyl rubber, also known as IIR (Isobutylene Isoprene Rubber), is a synthetic rubber with exceptional impermeability to gases. It is primarily composed of isobutylene with a small amount of isoprene. This unique molecular structure gives butyl rubber excellent gas impermeability. It is highly resistant to the diffusion of gases, making it ideal for applications that require airtight seals. Butyl can withstand high temperatures, exposure to ozone, weathering and UV radiation. It also has good electrical insulation, making it suitable for electrical insulation applications.

Dimensions:

39mm ID x 4mm CS
ID Tolerance: ±0.4mm
CS Tolerance: ±0.1mm

Material Properties:

Hardness: 65 ShA
Colour: Black
Temperature Range: -59°C to +121°C

Key Benefits of Butyl (IIR) O-Rings:

Excellent Gas and Moisture Impermeability
Good Chemical Resistance
Resistance to Ozone and Weathering
Low Temperature Flexibility
Durability and Longevity
Resistant to Heat and Aging"

Chemical Resistance:

Excellent resistance to acids, alkalis, and alcohols
Good resistance to water, gases, and many polar solvents
Resistant to Skydrol

Not Compatible With:

Aromatic and chlorinated hydrocarbons
Strong oxidising agents and certain oils at high temperatures

Key Applications:

Medical and Pharmaceutical Equipment
Food and Beverage Processing
Vacuum Systems
Automotive and Industrial Sealing