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STS 1 is an Organo Butyl Tin Mercapto Stabilizer. It provides outstanding Heat & Light stability maintaining initial colour. Being an effective Heat Stabilizer for crystalclear applications & requires lower doses compared with other stabilizers.STS 1 is recommended in crystal clear PVC Sheets, Blow Moulding, Rigid Films,Injection Moulding, Calendaring Process, Extrusion etc. Being a strong Heat Stabilizer, it can be used for higher temperature processing.