Chemical Resistance
The Teflon encapsulation is the essential component of the CHEM-RING and it is resistant to practically all chemicals. Within normal use temperatures, TEFLON resins are attacked by so few chemicals that it is more practical to describe the exceptions rather than to tabulate the chemicals with which they are compatible. Molten alkali metals, fluorine and several complex halogen compounds (chlorine trifluoride) are incompatible with TEFLON resins.

In some instances, at or near the suggested service limit temperatures of TEFLON ---FEP (204C/400F) and TEFLON --- PFA (260C/500F), a few chemicals at high concentrations have been reported to be reactive. Attack has been produced at such high temperatures by 80%NaOH or KOH, metal hydrides such as boranes (e.g.---B2 H6), aluminium chloride, ammonia (NH3), and certain amines (R---NH2) and imines (R = NH). Also, slow oxidative attack has been observed by 70% nitric acid under pressure at 250C/480F.

Special testing is required when such extremes of reducing or oxidising conditions are approached. Except for the chemicals under the conditions mentioned, it can be said that the VULCAN CHEM-RING, in general, is chemically inert.

Typical Chemicals with which "Teflon" Resins are Compatible

Tel: +44(0)114-2493333
Fax: +44(0)114-2493322

Email:
sales@vulcan-eng.com

Back

Kamlock Gaskets