YH series drilling and civil engineering bentonite:
Drilling and civil engineering bentonite is made by API and OCMA standard.Our quality assurance program meets the requirements of ISO9001 and all other recognized governing bodies in China.It can be used as low solid phase mud in under ground civil engineering and drilling field.
https://www.chinabentonite.net/bentonite/sodium-bentonite/api-grade-bentonite-for-drilling.html