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See Chinese contents: GB/T 9988-1988 GB/T 9988-1988: Test method for alkali resistance of porcelain enamels
This Standard specifies the test method for the alkali resistance of the enamel product surface layer. This Standard is applicable to the alkali resistance of the daily use and the quality of the ceramic layer of sanitary enamel products. If sodium hydroxide solution is used as the test medium, this Standard is also applicable to the quantitative measurement of the alkali resistance of porcelain surfaces of enamel glass products.
