白炭黑是人工合成的水合二氧化矽,分子式為mSiO2·nH2O[來源請求]。外觀為白色蓬鬆粉末,原始粒子極細,質輕,松密度為0.128 g/cm3,在空氣中吸收水分後成為聚集的細粒子。比表面積吸附容量和分散能力都很大,吸油率可達200ml/100g。故為農藥可濕性粉劑的理想載體。白炭黑作載體,價格較高,故一般應用於高檔高濃度的可濕性粉劑加工中,或與其它載體復配使用。

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