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Strictly Necessary
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Ahlstrom Grade 94 Quantitative Filter Paper, Ashless
Ahlstrom Grade 94 Slow Speed Ashless Filter Paper. Grade 94, 1.5µm - Slow Speed. This is an extremely fine retention filter for critical gravimetric analysis of very fine particles such as barium and lead sulfates, stannic and nickel sulfide, calcium oxalate and calcium fluoride.