Quantitative Filter Paper, Hardened Ashless

Photo of 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.

Photo of Ahlstrom Grade 75

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.

Photo of 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.
Photo of Whatman Grade 542 Quantitative Filter Paper

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.

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Photo of Whatman Grade 541 Quantitative Filter Papers, Hardened Ashless

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.

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Photo of Whatman Grade 540 Quantitative Filter Paper, Hardened Ashless

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.

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