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I recently etched some thin brds .032 size with muratic acid and hydrogen
peroxide per 3/4 cup muratic acid & 1 & 1/2 cup hydrogen peroxide mixture. I coated the traces with liquid tin then center punched the pads. I started drilling the pads with a dremel like variable speed moto tool and brand new high speed drill bits only to have pads pull away from copper clad brd. Why did this happen? Does anyone know as all I can tell is these are cheep orient type board stock bought in large pieces from a E-Bay buyer. It also took 15 to 20 min to etch boards at 120 degree temps. Professional positive brds in 1/16 thickness etched quite fast plus the pads did not pull away from fiberglass
at all. Am I right to assume that I got a bad batch of boards from E-Bay. Any input would help me figure this one out as other board stock did not behave like tis over the past 4 years also.