5 gram vial of precisely the same polyimide (polyamic acid) used in manufacturing GC and CE capillary: a semiconductor grade copolymer of 3,3',4,4'-benzophenone tetracarboxylic acid dianhydride (BTDA), 4.4'-oxydianaline (ODA) and m-phenylene diamine (MPD) at roughly 20% solids in n-methyl-2-pyrollidone (NMP), wt/wt. Other suppliers offer wire grade polyamic acids, at best, so while we do not advocate the use of these resins at all, if you are going to use them, at least use the right one. Wire grades utilize lower cost solvent systems that generally contain 2 or 3 organic solvents such as acetone, toluene, xylene, etc., but the single largest differentiator between wire grade and semiconductor grade is the particulate content. Semiconductor grades are filtered to sub-micron levels where wire grades are not, so in an application where a particle as small as a micron can start a column fracture, semiconductor grades are an absolute necessity. MSDS available on request. Check the MSDS of competing suppliers and note the solvent system... Store at subzero temperatures for years of shelf life, but be sure to allow it to come to RT before opening, least you contaminate the resin with water.
Part #: 3-2525S (5 gram vial of polyimide resin) -- $25.00 ea