The present invention relates to a shaped article for high purity applications
containing at least one peroxide curable compound containing a substantially gel-free
butyl polymer. In another of its aspects, the present invention relates to a sealing
material and a medical device containing at least one peroxide-curable compound
containing a substantially gel-free butyl polymer. In still another of its aspects,
the present invention relates to a fuel cell containing at least one peroxide curable
compound containing a substantially gel-free butyl polymer. In still another of
its aspects, the present invention relates to halogen-free and sulfur-free shaped articles.