Thick Copper Filler for High Power PCBs

Thick copper (high-build copper or deep copper) printed circuit boards are used in high power circuits to allow high currents to path through the conductors without significant heating effects. A reliable surface protection with a solder mask is basically possible, may however cause severe problems with edge coverage on the copper tracks. To overcome such problems and to support end user reliability especially in critical environments like automotive, the so-called thick copper filler process is the method of choice. In a first step the spaces between high copper tracks are filled, then the surface is leveled after curing. Thereafter a thin layer soldermask is coated on the planar surface according to given requirements. This way no edge coverage issues are possible.

Thick Copper Filler Description
DSF 2706 UV is an UV-curing 2-component high viscose lacquer. It is green and applied by (screen) printing after mixing. The CTE is adjusted such that it can be reliably used for outerlayer thick copper.
DSF 2707 UV, a 1-component green and high viscous lacquer. Its equally applied by (screen) printing and UV-cured.

Thick Copper Filler General Process Description
Both of our current products are applied by horizontal (screen) printing. As the lacquer contains 100% solids a flash-off is not required. After UV-curing the surface is leveled by grinding and carefully cleaned before the solder mask application. As the best fitting soldermask we recommend SD 2460 FLEX a thermal curing flexible solder mask able to take up thermal and mechanical stress.

Thick Copper Filler Features and Benefits

		Reliably fills spaces between high copper tracks
		No edge coverage problems with solder mask
		High reliability especially in reliability sensitive automotive application
		High flexibility to take up thermal stress
		Excellent electrical properties
		Qualified by major OEMs
		Recommended solder mask: SD 2460 FLEX (for highest in-use reliability)
		Compliance with UL 94 V0

Thick copper filler, Manufactured by Lackwerke Peters distributed and serviced in Asia by Atotech

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