The thermal insulation coating material was prepared by ultrafine processing in the ball mill using the natural sepiolite porous mineral.
将天然海泡石多孔矿物材料进行适当粒度的球磨加工，制成隔热涂料。
Their anti-wear and extreme pressure properties in rapeseed base oil and mineral base oil were tested on the four-ball tester.
通过四球试验机考察了它们在菜籽油和矿物油中的抗磨性能与极压性能；
S. A. Resarches in recent years reveal that a lot of ball clay mineral resources occur in China and ball clay is exported from China.
近年来经过我们专题研究，甄别和发现了大量的球黏土矿区还有深加工产品，改进口为出口。
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