Flare cap, N 20, aluminum, hole, Sil. blue tr./PTFE colorless (Pharma-Fix), 3mm

Description

These closures with a high-purity silicone/PTFE molded disc are only laminated with PTFE in the area of contact with the sample. In this way, the elastomeric silicone can achieve a particularly good seal on the glass edges of the bottle, while fully PTFE-laminated septa have a very slippery surface on the glass and can therefore be easily rotated.