This thin wall joint sleeve will fit inside a QuickFit glassware joint to prevent stickingout the need for grease.
An ideal choice to prevent sticking glasswareout introducing grease which could contaminate the system.
The sleeves are around 0.05mm thick and willstand low to medium vacuum application.
As the sleeves are so thin, you do not need to adjust the QuickFit fittings at all (i.e. 19/26 sockets will still fit to 19/26 cone the sleeve in between the two)
PTFE has excellent chemical and thermal resistance.