Rank: Member
Groups: Registered
Joined: 8/27/2020(UTC)
Posts: 20
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Grade 42：2.5um A world standard for critical gravimetric analysis with the finest particle retention of all NWESTRA cellulose filter papers typical analytical precipitates include barium sulfate,metastannic acid and finely precipitated calcium carbonate. https://www.newstarsciences.com/...lter-paper-grade-42.html
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