DIN EN ISO 8501-3:2007 涂料及其相關產品使用前鋼基片的制備.表面清潔度的目視評估.第3部分:有表面缺陷的焊縫、邊緣和其他區域的制備等級
Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part 3: Preparation grades of welds, edges and other areas with surface imperfections (ISO 8501-3:2006); English version of DIN