Outstanding resistance to caustic alkalis up to and including the molten state. In acid, alkaline and neutral salt solutions the material shows good resistance, but in oxidising salt solutions severe attack will occur. Resistant to all dry gases at room temperature and in dry chlorine and hydrogen chloride may be used in temperatures up to 550C. Resistance to mineral acids varies according to temperature and concentration and whether the solution is aerated or not.
Corrosion resistance is better in de-aerated acid.
Virtually immune to inter granular attack above 315C, chlorates must be kept to a minimum. Manufacture of soap. Analine hydrochloride production and in the chlorination of aliphatic hydrocarbons such as benzene, methane and ethane. Manufacture of vinyl chloride monomer. Storage and distribution systems for phenol - immunity from any for of attack ensures absolute product purity.