Screw thread graduated media/storage bottles come assembled with polypropylene closures welded to PTFE/Silicone liners. Closures are ideal for repeated autoclaving. The PTFE/Silicone liner also eliminates the possibility of glue contamination. With a large white marking spot.

PHENOLIC CLOSURE 33-430, PTFE/RUBBER LINER, Cs. 144

Excellent for general laboratory use Specially formulated phenolic resin and liner adhesive to withstand the effects of repeated autoclaving PTFE-faced/general purpose white rubber liners are highly resistant to chemical effects Identified in ASTM Specification E982, Class A requirements