Chlorobutyl rubber – Clwyd Compounders

Clwyd reference	CIIR
ASTM classification	CIIR
Typical applications	‘O’ Rings Vacuum seals and membranes Steam hoses Pharmaceutical closures Tire inner tubes
Advantages	High impermeability Better heat resistance Addition of bromine results in faster curing and better adhesion to unsaturated polymers
Disadvantages	Lower resilience

Available hardness range (Shore A)	35 - 90
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)	650%

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	Good
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	Excellent
Radiation	Good