Patent ID: 6974851

Claim:
A shaped vulcanized article for high purity applications comprising at least one compound comprising: a. at least one elastomeric polymer comprising repeating units derived from at least one C 4 to C 7 isomonoolefin monomer, at least one C 4 to C 14 multiolefin monomer, at least one multiolefin cross-linking agent and at least one chain transfer agent, and wherein said polymer comprising less than 15 wt. % of solid matter insoluble in boiling cyclohexane under reflux for 60 min, b. at least one filler and c. a peroxide curing system; wherein the chain transfer agent is selected from 1-methylcycloheptene, 1-methyl-1-cyclopentene, 2-ethyl-1-hexene, 2,4,4-trimethyl-1-pentene, indene or mixtures thereof wherein the shaped vulcanized article is halogen-free and sulfur free.