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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 24328.12-2020 |
Tissue paper and tissue products—Part 12: Determination of optical properties—Determination of Opacity—Diffuse reflectance method 卫生纸及其制品 第12部分：光学性能的测定 不透明度的测定 漫反射法 |
China National Standards Opacity |
 English PDF |
| GB/T 21300-2007 |
Plastics pipes and fittings - Determination of Opacity 塑料管材和管件 不透光性的测定 |
China National Standards Opacity |
English PDF |
| GB/T 1543-2005 |
Paper and board-Determination of Opacity(paper backing)-Diffuse reflectance method 纸和纸板 不透明度(纸背衬)的测定(漫反射法) |
China National Standards Opacity |
English PDF |
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