NP EN ISO 11125-4-1999 在使用油漆以及类似物质之前来制作钢制衬底．对金属研磨剂（喷砂保护处理）进行测试．第4部分：表观密度的测量（ISO 11125-4-1993）
Preparation os steel substrates before application of paints and related products Test methods for metallic blast-cleaning abrasives. Part 4: Determination of apparent density (ISO 11125-4:1993)