EW Polymer Group


Butyl Rubber

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Copolymer rubber of brominated Isobutylene-Isoprene, low mooney viscosity, fast cure rate grade.

Basic Properties

PropertiesUnitIndexTest Method
 Product Form    Off-white  Visual
 Mooney Viscosity (ML1+8,125℃)  MU  32±5  ISO 289/ASTM D1646
 Volatile Matter  wt%  ≤0.7  ISO 248/ASTM D5668
 Bromine Content  wt%  2.1±0.2  CENWAY METHOD
 Total Ash  wt%  ≤0.7  ISO 247/ASTM D5667
 Antioxidant (non-staining)  wt%  ≥0.02  CENWAY METHOD
 Stabilizer  wt%  1.3±0.3  CENWAY METHOD

Cure Characteristics

PropertiesUnitIndexTest Method
 FL  dN•m  2.5±0.9  ISO 6502/ASTM  D5289
 FH  dN•m  7.4±1.4  ISO 6502/ASTM  D5289
 ts1  min  2.4±1.5  Rotorless cur (MDR)
 tc50  min  4.3±1.8  160℃X40min,0.5°arc
 tc90  min  6.6±2.8  160℃X40min,0.5°arc
 Test Formulation  ISO 7663/ASTM D 3958 BI IR2301 100, IRB#7  40, Zn0 5, St.A 1

Bromobutyl Rubber BI IR 2301 has superior air impermeability, outstanding performance of heat-resistance, chemical corrosion-resistance, thermal aging resistance, and good curing performance. It is especially used for medical stoppers, and other applications as corrosion-resistance lining, protective clothing, shoes production and TPV industry.

Safety & Toxicity
BI IR 2301 is polymer in solid with stable performance. It is harmless and not dangerous for humans, plants and animals. For relevant safety data and reference, please refer to MSDS.

25 ± 0.5 kg/bale in EVA film.
Pallets of plywood box of 1050 kg with 42 bales.
Pallets of metal box of 1200 kg with 48 bales.

Storage Life & Conditions
Two years with keeping storage & transport under 35℃ and against sunlight.