DIN ISO 6370-2:2013-08

Extensive tests have shown that, with the comparative method described in this part of ISO 6370 test results of 5 % can be achieved. For the absolute determination, however, deviations of 30 % or more can occur at a comparable effort. Furthermore, absolute quantities for the amount of wear give little information, because abrasives used in practice differ considerably in their effect on enamelled surfaces. Each abrasion test with a standardized method can only be carried out with the aim of providing a general classification of various vitreous and porcelain enamels in relation to each other. Absolute quantities for the amount of wear are therefore not required. Numerous tests have shown that the three required test periods of 30 min were sufficient to obtain comparable results. If the vitreous and porcelain enamel coat to be tested is thicker than 0,2 mm, it is not necessary to determine the loss in mass after each 30 min test period, because the abrasion under the conditions described in this part of ISO 6370 is directly proportional to the test duration. This part of the International Standard ISO 6370 specifies a test method for determining the resistance of vitreous and porcelain enamel coatings to abrasion by rubbing, grinding or other mechanical effects. This International Standard ISO 6370-2:2011 has been prepared by ISO/TC 107 "Metallic and other inorganic coatings"(secretariat: KATS, South Korea). At DIN, the German Institute for Standardization, the responsible Working Committee is NA 062-01-63 AA "Prüfung von Emails und Emailierungen" ("Testing of vitreous and porcelain enamels") of the Material Testing Standards Committee (NMP).