ISO/NP 28706-6

Vitreous and porcelain enamels — Determination of resistance to chemical corrosion — Part 6: Determination of resistance to chemical corrosion by alkaline liquids using a cylindrical vessel with a volume surface ratio 3:1 cm

Scope

This document describes a test method for the determination of the resistance of vitreous and porcelain enamelled articles, that is intended for laboratory development purposes only, to attack by alkaline liquids at temperatures between 25 °C and 95 °C. The apparatus used is a cylindrical vessel with a volume surface ratio of 3:1 in which two enamelled specimens are tested.
NOTE 1 The test method was initially set up for determination of the resistance of vitreous and porcelain enamels to a hot sodium hydroxide solution. Within the scope of this part of ISO 28706, the resistance of other alkaline liquids can be tested.
NOTE 2 This part of ISO 28706, which uses a cylindrical vessel, is generally used for tests carried out on vitreous and porcelain enamel coatings for enamel developments regarding alkaline attack.