Butyl rubber (IIR) | Clwyd Compounders

Clwyd reference	IIR
ASTM classification	IIR
Typical applications	Air-tight seals Bladders in sports balls (football, basketball etc.) Gas masks
Advantages	Its impermeable to water and air (acts as barrier). It has good flex properties and good physical strength.
Disadvantages	Poor flame resistance Poor oil resistance Poor compatibility with other polymers – low adhesion properties

Available hardness range (Shore A)	35 - 85
Upper continuous service temp.	130°C
Min. temp. for sealing applications	-50°C
Minimum non-brittle temp.	-70°C
Tensile strength (up to)	18 MPa
Elongation at break (up to)	>700%

Price Bracket	Very low
ASTM 1 Oil	None
ASTM 2 Oil	None
ASTM 3 Oil	None
Kerosene	None
Liquid B	None
Liquid 101	None
Phosphate ester	Good
Ketone	None
Toluene	None
Iso-octane	None
Methanol	Excellent
Acid (weak)	Good
Acid (strong)	None
Base (weak)	Excellent
Base (strong)	Good
Hydrogen sulphide	Excellent
Steam	Good
Ozone	Good
Radiation	Good