Exxon™ Butyl Polymers and Halogenated Butyl Rubber (BIIR+CIIR)

EXXON™ Butyl Polymers


The very low levels of unsaturation between long segments of polyisobutylene in EXXON Butyl polymers produce unique elastomeric qualities that provide applications in a wide variety of finished rubber articles.
     -  Low rates of gas permeability
     -  Thermal stability
     -  Ozone and weathering resistance
     -  Vibration damping and higher coefficients of friction
     -  Moisture and chemical resistance

EXXON™ Butyl rubber is commercially vulcanized by three basic methods:
     -  Accelerated sulfur vulcanization
     -  Crosslinking with dioxime and related dinitroso compounds
     -  Polymethylol-phenol resin cure

EXXON™ Butyl Polymers standard 75 lb. bales are provided with either of these wraps:
     -  EVA: Inclusion film. Melting Point @ 93 to 96°C
     -  RFU: Blue colored Removable Film Unit or strippable film

EXXON™ Butyl grades have FDA food contact compliant.

EXXON™ Halogenated Butyl Rubber (BIIR and CIIR)


As EXXON™ Bromobutyl and EXXON™ Chlorobutyl both contain the predominantly saturated backbone of Butyl, these polymers have many of the attributes of the Butyl polymers:
     -  Low permeability to air, gases and moisture
     -  Vibration damping
     -  Low glass transition temperature
     -  Resistance to ageing and to weathering from atmospheric exposure
     -  Wide vulcanization versatility
     -  Fast cure rates
     -  Processing safety: no nitrosamines or nitrosamines precursors

Halobutyls display additional covulcanization with general purpose high-unsaturation elastomers, like natural rubber, polybutadiene, and styrene-butadiene rubber, while maintaining the mostly saturated backbone structure.

EXXON™ Bromobutyl and EXXON™ Chlorobutyl standard 75 lb. bales are provided with either of these wraps:
     -  EVA: Inclusion film. Melting Point @ 93 to 96°C
     -  RFU: Blue colored Removable Film Unit or strippable film

EXXON™ Bromobutyl Polymers


EXXON™ Bromobutyl is structurally similar to EXXON™ Chlorobutyl and, like Chlorobutyl it has a broader vulcanization latitude than butyl due to its reactive functionality.

In relation to Chlorobutyl, Bromobutyl provides an additional level of crosslinking reactivity based upon its lower C-Br bond energy, compared to the C-Cl bond. This results in compounds with faster cure rates that can utilize a wider assortment of curative systems. As a result, Bromobutyl provides an even higher level of co-curing compatibility with general purpose elastomers than Chlorobutyl.

EXXON™ Chlorobutyl Polymers


EXXON™ Chlorobutyl can be vulcanized with certain curative systems to provide improved properties at elevated temperatures in comparison to Butyl. It also enables a degree of covulcanization with general purpose rubbers which Butyl cannot achieve.

Due to the relative reactivity of carbon-halogen bonds, Chlorobutyl reacts more slowly than Bromobutyl, so it possesses a more predictive cure response with additional scorch and processing safety, and less sensitivity to mixing, processing, and storage conditions.

Exxon™ BUTYL 065 EVA Rubber Polymer

Mooney Viscosity - 45±4 Cure Rate - Slowest
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Exxon™ BUTYL 268 EVA Rubber Polymer

Mooney Viscosity - 51±4 Cure Rate - Medium
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Exxon™ BUTYL 268 RFU Rubber Polymer

Mooney Viscosity - 51±4 Cure Rate - Medium
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Exxon™ BUTYL 365 EVA Rubber Polymer

Mooney Viscosity - 47±4 Cure Rate - Fastest
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Exxon™ BUTYL 365 RFU Rubber Polymer

Mooney Viscosity - 47±4 Cure Rate - Fastest
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Exxon™ BROMOBUTYL 2211 EVA Bromobutyl Polymer

Mooney Viscosity - 32±5 Cure Rate - Fast
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Exxon™ BROMOBUTYL 2222 EVA Bromobutyl Polymer

Mooney Viscosity - 32± Cure Rate - Regular
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Exxon™ BROMOBUTYL 2244 EVA Bromobutyl Polymer

Mooney Viscosity - 46±5 Cure Rate - Fast
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Exxon™ BROMOBUTYL 2255 EVA Bromobutyl Polymer

Mooney Viscosity - 46±5 Cure Rate - Regular
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Exxon™ CHLOROBUTYL 1066 EVA Chlorobutyl Polymer

Mooney Viscosity - 38±5
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Exxon™ CHLOROBUTYL 1066 RFU Chlorobutyl Polymer

Mooney Viscosity - 38±5
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