PTFE Beaker Covers and Watch Glass

All SPI Supplies PTFE beaker covers, which can also be used as watch glasses, are chemically inert, non-contaminating, and are thermally stable in the range of -200°C (390°F) to + 280°C (+536°F). The beaker covers also have a super smooth finish making it virtually impossible for anything to stick to the surface of these fine laboratory products, making them very easy to clean up for reuse in another experiment. They are especially useful during digestion procedures where it is important to contain the liquid in the beaker.

PTFE beakers cannot be taken to temperatures as high as glass. The user has to be sure they do not overheat PTFE beakers or their covers. If PTFE is overheated, especially in air, it can start to break down by both thermal decomposition and oxidation, resulting in fumes of HF, which should not be inhaled under any circumstances.