BS 7897-2-1997 标准详情
- 标准号:BS 7897-2-1997
- 中文标题:虫胶和紫胶片规范.第2部分:机制紫胶片
- 英文标题:Specification for lac and shellac - Machine-made shellac
- 标准类别:英国标准
- 发布日期:1997-08-15
Specifies four main types of machine-made shellac based on different methods of manufacture. Each type is graded on the basis of colour. Requirements for matter insoluble in hot alcohol are given along with optional requirements for: volatile matter,
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