insoluble substance meaning in English

不溶物质
不溶性物质

Lignite wax - determination of benzene insoluble substance
褐煤蜡中苯不溶物测定方法
Method of benzene - insoluble substances determination for pesticide emulsifiers
农药乳化剂苯不溶物测定方法
Test method for the insoluble substance in ethanol of alcohol soluble dyes
醇溶染料在乙醇中不溶物含量的测定方法
Boric acid for industrial use - determination of insoluble substance content in water
工业硼酸水不溶物含量的测定