Specification for limits of metal release from ceramic ware, glassware, glass ceramic ware and vitreous enamel ware Ingestion-build-47786 EN 61000-4-11:1994

EN 61000-4-11:1994

It also talks about the Bullers ring which is an annular ring of pressed ceramic powder that contracts with heat work

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Specification for limits of metal release from ceramic ware, glassware, glass ceramic ware and vitreous enamel ware Ingestion-build-47786 EN 61000-4-11:19941 Scope This British Standard specifies limits for lead and cadmium, expressed as a concentration of the elements, released from ceramic, glass, glass ceramic and vitreous enamel articles intended for use in contact with foodstuffs, when the article is subjected to a specified method of test. NOTE The titles of the publications referred to in this standard are listed on the inside back cover.