
Jewellery and precious metals - Fineness of precious metal alloys
出版:Netherlands Standards

专家解读视频
NEN-EN-ISO 9202 specifies a range of fineness of precious metal alloys (excluding solders) recommended for use in the field of jewellery.
ISO 9202 : 2019 - Identical
EN ISO 9202:2019 - Identical
EN ISO 9202:2019 - Identical
ISO 9202 : 2019 - Identical