First, product use and principle

The basic principle of the product is: after the vacuum pump is started, the pressure of the vacuum tank is reduced to -0.9Mpa (near a negative atmospheric pressure) and then the vacuum pressure in the vacuum tank is maintained. The user will load the cut round plate sample. Inside the sealing fixture, the solenoid valve is opened, and a pressure difference of 0.9Mpa is generated at the upper and lower ends of the plate sample. The air that has been filtered and filtered flows through the plate from high pressure to low pressure. When the pressure reaches stability, the air flow and differential pressure are recorded. The value is calculated and the permeability of the sheet is calculated.

Second, technical indicators