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Ensinger PEI

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ExxonMobil Exxon™ Bromobutyl 7244 Rubber
Categories: Polymer; Thermoset; Rubber or Thermoset Elastomer (TSE)
Material Notes: White to amber bales.  Slow 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 - 1.13 %ExxonMobil Method
Calcium, Ca 0.14 - 0.20 %ExxonMobil Method
H2O, Water <= 0.30 %ExxonMobil Method
 
Descriptive Properties
Antioxidant (non-staining)0.01 - 0.075wt%. Non-staining. Irganox 1010 ExxonMobil Method
Cure Characteristics14.5 - 23.5dN*m. ML. 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)
 6.0 - 14.0min. t'90. ASTM D2084 (mod). Rheometer ODR 2000 standard compound: ASTM D3958 (mod).
Stabilizer1.0 - 1.6
 Epoxidized soybean oil

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PEX98814 / 238199

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