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摘要

A novel elastomer material having an absorption coefficient for laser light of 0.5-2.5 mm−1, preferably being a base thermoplastic elastomer compounded with a colorant which comprises a Pantone 4597C pigment mixed with a carrier material. The elastomer is suited for use as a pharmaceutical vial closure which can be punctured by a filling needle and the puncture hole heat sealed by a focused laser.