The products are made of Borosicate 3.3 glass.
According to its pore size, the sand core filter plate can be divided into six specifications of G1 - G5.
ISO Standard National Standard Aperture Use
P70 G1 50-70um filter out coarse precipitate and gelatinous precipitate
P50 G2 30-50um filter out coarse precipitation and gas washing
P30 G3 16-30um filter out fine precipitate, filter mercury
P7 G4 4 - 7um filter out fine or extremely fine precipitates
P4 G5 2 - 4um filter out larger bacilli and yeast

*Newly purchased products are washed once with hot hydrochloric acid or chromium sulfate and rinsed with distilled water to remove possible dust and impurities.
*This product can be customized with other aperture sand cores. If you need to customize other types of sand cores, please communicate with us through Amazon message and we will customize the products you need.