... 80%,above 90% Hardness:3-3.5 usage: oil drilling paiting Filling of plastic 1. Specification:BaSO4 ... as Ca (mg Ca/Kg) : 250mg/kg Maxbarite for oil drilling (325mesh) FAQ increase the drilling mud agent: ... general use of the drilling mud, clay, accounting for around 25, the proportion of water to 1, ... mud, sometimes mud weight can not be underground oil and gas pressure balance, causing blowout. In the ...