Glass Vials Rubber Stopper, Chlorobutyl, Grey, Neck Size: 20mm, PTFE Teflon Coated, 1000 Pieces/Pack

The Chlorobutyl Rubber Stopper is a high-performance vial sealing, these 20mm rubber stoppers are manufactured from premium chlorobutyl rubber and feature a chemically resistant PTFE (Teflon) coating on the contact surface. Designed to maintain the integrity of sensitive contents, they offer excellent resistance to moisture, gas permeability, and chemical interaction—making them ideal for pharmaceutical, laboratory, and industrial applications.