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 um | 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. |
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