Corning Phenolic Screw Caps with PTFE LIners

These reusable Corning® phenolic screw caps are fabricated specially formulated resin to resist the effects of temperature and steam in autoclaving. Black phenolic screw caps have GPI thread thread finishes and are provided with a glued-in rubber liner over which is firmly bonded a PTFE interface to provide a highly inert sealing face. Mulitple sizes of GPI thread finishes are available to fit any corning bottle.