>Does anyone know of a supplier for small chunks of telfon (say about >12x12x5 cm) in the states? Hi Bill (and others who may be interested), You might want to check with McMaster-Carr Supply Co. in Los Angeles (562-692-5911, www.mcmaster.com). They sell Teflon in rectangular bars by the foot, up to 2" thick and 4" wide. As a general comment, I've found McMaster-Carr to be an excellent source for all kinds of things - various types of tubing (metric and imperial sizes), aluminium and steel rods, compressed air regulators and fittings, etc. A highly recommended vendor. Cheers, Simon ***** Simon R. Poulson Dept. of Geological Sciences, MS-172 University of Nevada-Reno Reno, NV 89557-0138 USA Phone: (775) 784-1104 Fax: (775) 784-1833 [log in to unmask] *****