The application of the frit depends on the size of its pores. According to ISO standard 4793, man distinguish seven pore sizes refers to the filtration purpose:

ISO-identification	Identification	Diameter of pores in µm	Applications of the frits
P 500	POR 00 / G 00	250-500	Filtration of coarse precipitates, gas distribution in liquids with low gas pressure.
P 250	POR 0 / G 0	160-250	Filtration of coarse precipitates, gas distribution in liquids with low gas pressure.
P 160	POR 1 / G 1	100-160	Coarse filtration, gas distribution with higher pressure.
P 100	POR 2 / G2	40-100	Preparative fine filtration, preparative work with crystalline precipitates, diffusion of gases in liquids.
P 40	POR 3 / G 3	16-40	Analytical filtration, analytical work with medium precipitation, preparative work with fine precipitates, diffusion of gases in liquids.
P 16	POR 4 / G 4	10-16	Analytical fine filtration, analytical and preparative work with very fine precipitates, very fine gas distribution in liquids by means of pressure, shut-off valves for mercury.
P 1,6	POR 5 / G 5	1-1.6	Ultrafine filtration, bacteriological filters, filtration of larger microorganisms, extremely fine gas distribution in liquids by means of high pressure.

Double jacketed nutsche filter with frit and joint, 100 ml to 1.000 ml

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