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Rubber in Engineering Group @ Clwyd - Sep 2018

Clwyd welcomed the Rubber in Engineering Group on Friday 21st September, more than 20 experts...read more

Polymer Types - BIIR - Bromobutyl rubber...

Clwyd reference BIIR
ASTM classification BIIR

Derivative of butyl rubber which has been reacted with bromine in a continuous process.

Typical applications Inner tyre tubes, breathing apparatus for defence and fire services
Advantages

Low gas permeability
Excellent  ozone resistance
Good steam resistance
Good fire resistance

Disadvantages Poor resistance to oils and non-polar solvents
 
Available hardness range (Shore A) 35 – 90
Upper continuous service temp. (°C) 130
Min. temp. for sealing applications (°C) -50
Minimum non-brittle  temp.  (°C) -70
Tensile strength (up to) 18 MPa
Elongation at break (up to) 650%

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