IIR - Butyl rubber (IIR)

Clwyd referenceIIR
ASTM classificationIIR
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 BracketVery low
ASTM 1 OilNone
ASTM 2 OilNone
ASTM 3 OilNone
KeroseneNone
Liquid BNone
Liquid 101None
Phosphate esterGood
KetoneNone
TolueneNone
Iso-octaneNone
MethanolExcellent
Acid (weak)Good
Acid (strong)None
Base (weak)Excellent
Base (strong)Good
Hydrogen sulphideExcellent
SteamGood
OzoneGood
RadiationGood
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