Exxpro™ specialty elastomers

Pharmaceutical stoppers in various sizes and shapes

Exxpro specialty elastomers are brominated isobutylene paramethyl-styrene terpolymers (BIMSM). Together with Exxon™ halobutyl rubber, Exxpro specialty elastomers help the healthcare industry meet ever-changing requirements related to cleanliness, drug compatibility, low extractables and leachables.

Ideal for sensitive drugs and other demanding applications, Exxpro specialty elastomers are a super-clean solution and cost-effective alternative to expensive coated stoppers


  • High temperature resistance
  • Greater heat stability compared to EPDM rubbers
  • Low permeability and high damping similar to butyl rubber
  • Wide latitude in cure and cocure with a variety of rubbers
  • Ozone/weathering resistance