硅藻土是重要的非金属矿物材料。

Diatomite is an important nonmetallic mineral raw material.

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非金属矿物材料的改性方法可分为物理改性和化学改性。

Modification of nonmetallic mineral materials can be classified as physical and chemical.

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但是，无机非金属矿物填料的密度均高于炭黑、白炭黑等补强材料的密度，这严重制约着无机矿物材料在橡胶中的使用。

But, the densities of the inorganic minerals are higher than reinforce materials-carbon black, which heavy restricts the use of inorganic mineral materials in the rubber.

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