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Grade 75 is often used for filtering trace elements
coal and coke
Grade 55 is also used in air and foodstuffs analysis and for chloride and phosphorous in cement
as described in EPA Method 1311
Hardened Quantitative Filter Paper - 0550-0425 - Grade 55, 4.25cm 4.70cm Grade 75 is often usedAhlstrom Munksj 55 15 m, Fast Speed This is a fast filtering grade for gravimetric analysis of coarse particles and gelatinous precipitates (i. e.: aluminum and zirconium hydroxides) in acid and alkali solutions. Grade 55 is also used in air and foodstuffs analysis and for chloride and phosphorous in cement, coal and coke.
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