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ExxonMobil Exxon™ Bromobutyl 2244 Rubber
Categories: Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes: White to amber bales.  Regular cure rate grade.

Exxon™ bromobutyl rubber is derived from halogenating butyl rubber with bromine in a continuous process. It is structurally similar to Exxon™ chlorobutyl rubber and produced through the same halogenation process. Bromobutyl rubber grade slate offers a range of polymer viscosities and cure responses, reflecting adjustments in functionality and additives content. Compared with regular butyl rubber, Exxon bromobutyl rubber provides faster and more stable cure through carbon-carbon linking.  Benefits: Low permeability to air, gases and moisture, Low glass transition temperature similar to regular butyl, Wide vulcanization versatility, Fast cure rates, Processing safety: no nitrosamines or nitrosamines precursors.  Exxon bromobutyl rubber is a copolymer of isobutylene and isoprene.

Information provided by ExxonMobil.
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Physical PropertiesOriginal ValueComments
Density 0.930 g/cc
Mooney Viscosity 41 - 51
@Temperature 125 °C		ML 1+8. MV 200 or equivalent; ASTM D1646
 
Component Elements PropertiesOriginal ValueComments
Bromine, Br 0.930 - 1.23 %ExxonMobil Method
Calcium, Ca 0.080 - 0.16 %ExxonMobil Method
H2O, Water <= 0.30 %ExxonMobil Method
 
Descriptive Properties
Antioxidant (non-staining)0.02-0.12wt%. Non-staining. ExxonMobil Method
Cure Characteristics1.0-6.0min. ts2. ASTM D2084 (mod). Rheometer ODR 2000 standard compound: ASTM D3958 (mod).
 13.5-22.5dN*m. ML. ASTM D2084 (mod). Rheometer ODR 2000 standard compound: ASTM D3958 (mod).
 3.0-9.0min. t'50. ASTM D2084 (mod). Rheometer ODR 2000 standard compound: ASTM D3958 (mod).
 38.0-52.0dN*m. MH. ASTM D2084 (mod). Rheometer ODR 2000 standard compound: ASTM D3958 (mod)
 5.0-13.0min. t'90. ASTM D2084 (mod). Rheometer ODR 2000 standard compound: ASTM D3958 (mod).
Stabilizer1.0-1.6
 Epoxidized soybean oil

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ExxonMobil Exxon™ Bromobutyl 7244 Rubber
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PEX98811 / 238196




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