2．Main performance index

Subjects	Indicators
Appearance	Yellowy or yellow powder
Density，g/cm3	1.40-1.60
Moisture，%	≤8.0
Ignition residue，%	≤7.0
Hydrotrope	≤5%
Closure filtration，ml	≤35.0
PH	7---8
Density variance，g/cm3	≤0.02

Mud Properties:

Subject	Mud	Mud +4%samples
Density, g/m3	1.01-1.03	1.02-1.05
Surface viscosity, mPa.s	7-8	8-12
Plastic viscosity, mPa.s	5-6	4-7
Filtration, ml	18-21	≤10