These discs are designed to provide a highly inert and unreactive seal. Constructed of white pharmaceutical rubber with 0,1 mm of PTFE coating bonded to one side, they are excellent for use as cap liners when a highly inert non reactive seal is desired.

• Autoclavable with no loss of integrity after heating above 100 °C for five hours

Discs are rigid and more difficult to puncture than PTFE/silicone discs.