- The Bergquist Company is the world’s leading developer and manufacturer of thermal management materials which include Sil-Pad®, thermally conductive insulators and various specialty materials; Gap Pad®, gap filling materials, Hi-Flow®, phase change materials, Softface® and Bond-Ply®. Bergquist also manufactures one and two layer Thermal Clad®, IMS® (Insulated Metal Substrate) Thermal Clad® HT and Thermal Clad®LTI, thermal management substrates for high power surface mount applications. Bergquist is the global source for the processing of Thermal Clad®, IMS® circuits.