Butyl (IIR)

Butyl rubber, also known as isobutylene-isoprene rubber (IIR), is a synthetic rubber produced by copolymerizing isobutylene with a small amount of isoprene.

Properties

• Excellent impermeability to gases
• Good weathering resistance
• High flexibility over a wide temperature range
• Excellent resistance to chemicals and oxidation

Applications

• Tire inner tubes
• Seals
• Gaskets
• O-rings
• Hoses
• Adhesives
• Pharmaceutical stoppers

One notable characteristic of butyl rubber is its low gas permeability, which makes it particularly suitable for tire inner liners, where it helps maintain proper tire pressure over time. This property also makes it valuable for applications where airtight seals are necessary, such as in pharmaceutical packaging and automotive components.