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Strictly Necessary
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Ahlstrom Grade 95 Quantitative Filter Paper, Hardened Ashless
Grade 95 Fine Retention Ashless/Hardened Filter Paper. Grade 95: 1.5µm - Slow Speed. This is an extremely fine retention filter for critical gravimetric analysis and metal determination of very fine particles such as barium and lead sulfates, stannic and nickel sulfide, calcium oxalate and calcium fluoride.