Quantitative Filter Paper, Hardened Ashless

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...

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.