Bergquist sil pad 400 thermally conductive insulating material bergquist sp 400ac 54 bergquist sil pad 400 to 220 adhesive pads pack of 22 designed to replace grease and mica for power applications and is ideal for reducing assembly time and maintaining cleanliness in production environments consists of a glass fibre sheet coated with a thermally conductive silicon elastomer bergquist sp 400ac 54 sil pad 400 adhesive pads to220 pack of 22