Making Kasil Frit
From Mswiki
Making Kasil Frit
Meng-Qiu Dong according to Edwin Romijn, 07/07/2006
1. Mix 300 ul Kasil®1624 potassium silicate and 100ul formamide (can be found on Edwin’s bench) in a GLASS vial or tube. tap the vial to mix them well.
2. Insert 0.25 mm ID undeactivated (NOT deactivated!) fused silica tubing into the mixture and immediately pull out (capillary action in a fraction of a second) and put them into a small beaker (50 ml)
3. Polymerize in oven 100 °C for > 4h to overnight (capillaries can be bent in the oven)
4. Resulting porous frits can be stored and used without further treatment (except cutting)
5.
before packing the column, cut the frit so only 1-2 mm frit is left.
Akira’s Version
Mix well 300 ul Kasil®1624 and 100 ul Kasil® No. 1 (both are potassium silicate only that No. 1 is more concentrated), then add 100ul formamide and mix well. The rest is the same. This produces a stronger frit according to our superb analytical chemist Akira Motoyama.
Kasil®1624 and Kasil® No. 1 potassium silicate are from “The PQ Corporation” (1-800-944-7422 and <a href="http://www.pqcorp.com/">www.pqcorp.com</a>).
Formamide (HCONH2, 99.5+%) is from Aldrich
Undeactivated fused silica tubing, 0.25 mm ID, 0.35 mm OD: “Agilent Technologies” (1-800-277-9770) cat# 160-2250-10
