GB/T 30789.7-2015 standard english preview version PDF file download
GB Standard Code
GB/T 30789.7-2015
Standard Category
China National Standards
GB Standard English Title
Paints and varnishes—Evaluation of degradation of coatings—Designation of quantity and size of defects,and of intensity of uniform changes in appearance—Part 7: Assessment of degree of chalking by velvet method
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