IKA RCT basic safety control Mode D'emploi page 14

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Chemical reactions of PTFE occur in contact with mol-
ten or solute alkali metals and alkaline earth metals, as well as
with fine powders of metals in groups 2 and 3 of the periodic
system at temperatures above 300 °C - 400 °C. Only elementa-
ry fluorine, chlorotrifluoride and alkali metals attack it; halogena-
ted hydrocarbons have a reversible swelling effect.
> 100 mm > 100 mm
Fig. 3