CIIR - Chlorobutyl rubber

Clwyd referenceCIIR
ASTM classificationCIIR
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 BracketVery low
ASTM 1 OilNone
ASTM 2 OilNone
ASTM 3 OilNone
KeroseneNone
Liquid BNone
Liquid 101None
Phosphate esterGood
KetoneGood
TolueneNone
Iso-octaneNone
MethanolExcellent
Acid (weak)Good
Acid (strong)None
Base (weak)Excellent
Base (strong)Good
Hydrogen sulphideExcellent
SteamGood
OzoneExcellent
RadiationGood
Menu