BIIR - Bromobutyl rubber

Clwyd referenceBIIR
ASTM classificationBIIR

Both butyl and halobutyl rubbers provide excellent inflation pressure retention. They are an ideal choice for inner tubes of bicycles, trucks, and industrial and agricultural tires. In fact, halogenated butyl rubbers are the most widely used butyl rubbers for tire inner liners. Halobutyl rubbers are also used for hoses, seals, membranes, tank linings, conveyor belts, protective clothing and for consumer products, such as ball bladders for sporting goods. Halobutyls are generally a good choice when good resistance to chemicals, weathering, and ozone is required.

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
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