[en] Insulation delamination problems were experienced with the resin system originally specified by TFTR engineering. After many experiments, it was determined that a reactive epoxy flexibilizer was required; a decrease in the proportion of the accelerator (BDMA) and additional fiberglass filler was needed in the resin rich areas of the coil bundle. Resins tested were of the DBEBA class, modifiers ranged from glycols to epoxies modified with reactive elastomeric groups, and curvatives were of the anhydride type. To process 2500 lbs (1130 Kg) of a four component epoxy resin system continuously, special processing equipment was designed and fabricated