Atotech India Ltd. Manufactures Thick Copper Filler for Heavy Copper PCBs. The quality management system of Atotech India Ltd. Has received ISO 9001 and ISO 14001 certifications. Thick Copper Filler for Heavy Copper PCBs are used in high power circuits to allow high currents to pass through the conductors without significant heating effects. Thick Copper Filler for Heavy Copper PCBs is a reliable surface protection with solder mask is basically possible, may, however, cause severe problems with edge coverage on the copper tracks.