Abrasion Resistance of Some Dry-Process Enamels

The resistance to abrasion of some dry-process cast-iron enamels was investigated using the new weight-loss method of testing abrasion resistance now under development by the Porcelain Enamel Institute. Some modifications of the test procedure based on preliminary studies, and which were accepted by the P.E.I. Quality Development Committee, were adopted for the investigation. The test differentiated between surface and subsurface abrasion resistance. Data obtained on eight commercial enamels showed the general superiority of acid-resistant enamels compared with non-acid-resisting compositions. It was found that longer smelting times and small mill additions of tin oxide improved the abrasion resistance. Changes in firing treatment had little effect on this property.