Whatman 1542-400 Quantitative Filter Paper, Hardened Ashless Grade 542, Circle, 2.7µm Pore Size, 400mm Diameter (Pack of 100)
The general purpose hardened ashless filter paper with medium retention and flow rate. Extremely pure and strong with a hard surface. High chemical resistance to strong acid and alkali. Frequently used in the gravimetric alysis of metals in acid/alkali solutions and in collecting hydroxides after precipitation by strong alkalis.High retention of fine particles under demanding conditions. Slow flow rate. Very hard and strong with excellent chemical resistance. Often used in gravimetric metal determitions.Hardened ashless: .6% ash maximum. These filters are acid-hardened to give high wet strength and chemical resistance with extremely low ash content. The tough surface makes these filters suitable for a wide range of critical filtration procedures.
Free US FedEx Ground shipping is for online orders greater than or equal to $500 if the item weighs less than 100lbs (actual and dimensional weight) and is inside of the contiguous United States (excluding Hawaii and Alaska).