Test Methods

The instrument applies continuous pressure to the high pressure side of the sample, when the gas on one side of the sample passes through the sample and reaches the other side of the infiltration solution and generates bubbles, the zui large pore size of the sample is calculated by this method.
Bubble point pressure
The value of pressure on the high pressure side when the gas passes through the sample and reaches the infiltration solution to produce the first series of continuous bubbles.
Larger aperture testing
For general filtration materials, the role of the larger aperture is obvious, the reason is that the size of the larger aperture directly affects the filtration effect, equivalent to a cylinder of the short plate, the shorter the short plate, even if the other plate is longer, the cylinder's water loading is also still determined by the short plate. Test the larger aperture instrument is mainly bubble point meter, you can choose the market more popular PMA series or FIA30 series bubble point meter test can meet the requirements.
Pore size analysis testPSDA pore analyzers based on the gas-liquid discharge method are better suited to measure 80 nm to 300 µm pores; PSDA pore analyzers based on the liquid-liquid discharge method are better suited to measure 5 nm to 200 µm pores. One issue of concern is the measurement pressure of the sample. Regardless of the measurement method, increasing the measurement pressure of the sample can detect smaller pore sizes. However, too high a pressure can cause a number of problems. First of all, some hollow fiber and tubular organic membrane samples can not withstand too high a pressure, generally no more than 5 kg; secondly, high pressure measurement may also bring problems to the sample sealing, because the sample often need to be squeezed to seal well; again, the vast majority of organic membrane samples in the high-pressure aperture deformation may occur or even closed, which will make the results of the measurement is meaningless. Therefore, the liquid-liquid discharge method is recommended for small aperture samples, while the gas-liquid discharge method can only be used for large aperture samples.