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Joined: 8/27/2020(UTC) Posts: 20
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NS 44 with fine particle retention is thinner than NS 42. The flow rate of NS 44 is twice of NS 42.It’s a filter paper for critical gravimetric analysis and metal determination of very fine particles such as barium and lead sulfates, calcium oxalate and calcium fluoride. https://www.newstarsciences.com/...-44-same-to-whatman.html
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