Quantitative Filter Paper, Hardened Ashless
Ahlstrom 95 Fine Retention Ashless/Hardened Quantitative Filter Paper
Ahlstrom 95: 1.5 µm - 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.
Catalog No.: F1325
Ahlstrom Grade 75 Medium Flow Rate Ashless/Hardened Quantitative Filter Paper
Ahlstrom 75, 2.0 µm - Medium Speed. 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. Ahlstrom 75 is often used for filtering trace elements, collecting hydroxides after precipitation by strong alkalis and in the analysis of metals in acid and alkali solutions.
Catalog No.: F1315
Ahlstrom 55 Fast Flow Rate Ashless Filter Paper
These standard ashless grades are high purity filter papers suitable for routine quantitative gravimetric techniques and in the preparation of samples for use in analysis involving instrumental techniques. Ahlstrom 55, 15 µm - 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. Ahlstrom 55 is also used in air and foodstuffs analysis and for chloride and phosphorous in cement, coal and coke.
Catalog No.: F1305
Whatman Grade 542 Quantitative Filter Paper. ALL SIZES
Whatman No. 542. Quantitative, hardened, ashless. High retention of fine (2.7 µm) particles under demanding conditions. Slow flow rate. Very hard and strong with excellent chemical resistance. Often used in gravimetric metal determinations. 100 circles/box. (Sample Photo Displayed. Individual items may differ from the image shown.)
Catalog No.: F1257
Whatman Grade 541 Quantitative Filter Papers, Hardened Ashless. ALL SIZES
Whatman Grade 541 acid hardened cellulose filter paper features high wet-strength, high chemical resistance and a large 22 µm nominal particle retention for fast analytical filtration. Maximum of 0.006% ash concentration. 100 circles/box. (Sample Photo Displayed. Individual items may differ from the image shown.)
Catalog No.: F1256
Whatman Grade 540 Quantitative Filter Paper, Hardened Ashless. ALL SIZES
Whatman Grade 540 filter paper is frequently used as a gravimetric filter during analysis of metals in acidic or alkaline solutions and in the collection of hydroxides. The acid-treated surface prevents tearing during filtration and allows the user to scrape precipitates from the paper. Nominal particle retention of 8 µm. 100/box. (Sample Photo Displayed. Individual items may differ from the image shown.)
Catalog No.: F1255