B311 lithopone: white paint, zinc sulfide content of 30%.
B311立德粉：白色颜料，硫化锌含量为30%。
B302 lithopone: white paint, zinc sulfide content of 28 percent, after surface treatment than the B301 have a better dispersion.
B302立德粉：白色颜料、硫化锌含量为28%，经过表面处理比B301有更好的分散性。
B302 lithopone: white paint, zinc sulfide content of 28 percent, after surface treatment than the B301 have a better dispersion.
B302立德粉：白色颜料、硫化锌含量为28%，经过表面处理比B301有更好的分散性。
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