The business involved in all kinds of rare earth calcination, ceramics, glass, metallurgy, tile, refractory, petroleum proppant, expanded perlite, medical chemical, ect.

业务涉及各类稀土灼烧、陶瓷、玻璃、冶金、砖瓦、耐火材料、石油支撑剂、膨胀珍珠岩、医疗化工等多个行业。

youdao

Carbo Ceramics is a leader in making what's called ceramic proppant, which is the synthetic material, sand-based often, with chemicals that are injected into the fractured rock to hold open the cavities so the natural gas goes up into the piping that captures it.

FORBES: Intelligent Investing