Hardened Quantitative Filter Paper - 0550-0900 - Grade 55, 9cm 54 which is then acid-washed using

which is then acid-washed using IN HNO3

This grade has medium flow rate and good particle retention and is most commonly used for applications requiring high chemical resistance to strong acid and alkali

Grade 75 is often used for filtering trace elements

coal and coke

Hardened Quantitative Filter Paper - 0550-0900 - Grade 55, 9cm 54 which is then acid-washed usingAhlstrom 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.