>>17
Applied fields are as follows.
( 1 ) Petroleum industry ; chemicals to adjust muddy water for boring, protecting chemicals for drills to dig petroleum wells, chemicals to prevent walls of petroleum wells from collapsing, decolorant and refining chemical for crude oil, etc.
( 2 ) Ceramics ;
ceramics, roof tile, tile, fire-proof brick, cement-raw material, granular binder for casting, etc.
一
