BS ISO 22764:2020 pdf free

BS ISO 22764:2020 pdf free.Jewellery and precious metals一Fineness of solders used with precious metal jewellery alloys. BS ISO 22764 1 Scope This document specifies the precious metal content in solders suitable for use in the production of jewellery made of precious metal alloys. 2 Normative references The following documents are referred to in the text in such a way that...
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