1,High quality,high technology. 2,High conductivity 3,Be up to the standard of ... mineral deposit of high closing pressure and low-permeability processed to make the petroleum formation crack, with the petroleum ... it with the stress releasing; as a result, the output of petroleum will increase because of the high flow conductivity of ... 69MPa, ≤3.5 86MPa, ≤4.5 102MPa≤5 High conductivity Ceramic Sand