CIRCUPOSIT™ Hole Prep 4126 Sweller is a solvent swell product designed to enhance the resin texturing and smear removal of high Tg materials in the subsequent CIRCUPOSIT Promotor stage. It is a unique process, which defines a new standard for via plating. CIRCUPOSIT Hole Prep 4126 Sweller has been formulated to be capable of processing both traditional FR-4 type laminates and more advanced high Tg materials.