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There are total 13 different grades of qualitative filter paper. The largest pore size is grade 4; the smallest pore size is grade 602 h; the most commonly used grades are grade 1 to grade 4. [6] 150mm qualitative filter paper. Grade 1 qualitative filter paper has the pore size of 11 μm.
Pabrik Kertas Indonesia or commonly known abbreviated as Pakerin or PT. Pakerin is an Indonesian pulp and paper company based in Surabaya, East Java. Pakerin was founded in 1977 at Mojokerto Regency by Njoo, Soegiharto.