项目                               指           标  　　 一等品                                合格品  
                 
氧化锌（ZnO）含量%         95—98 
水   份%                              ≦                        0.7                                    0.7  
水溶物含量%                        ≦                        0.5                                    0.5  
灼烧失量%                                                   1—4                                  1—4  
盐酸不溶物含量%                  ≦                       0.02                                  0.05  
氧化铅（Pb计）含量%           ≦                       0.01                                  0.05  
氧化锰（以Mn计）含量%        ≦                      0.001                                0.003  
氧化铜（以Cn计）含量%        ≦                      0.01                                   0.003  
细度（45um试验筛筛余物）% ≦                      45                                     45  
堆积密度g/mL                       ≦                      0.35                                  0.4

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