Civen use pure water to produce ED copper foil. If there are oil, paint, grease, fine mud in the water when produce ED copper foil, it will affect electrolytic copper foil surface roughness. These impurities in the water is difficult to remove, but can easily enter in the electrolyte. If the surface water reservoir is a paste glass steel, glass and steel must be completely dry after curing. First scrub with weak acid water, then wash with weak base water. After the fiberglass in the soluble polymer completely removed, and then store water for producing, otherwise it will cause electrolytic copper foil rough.
When the glass epoxy soaks at a certain temperature, some of the soluble polymer will be dissolved in the water. It will cause ED copper foil rough and pinholes by using that kind of water to make electrolyte. This kind of water will cause the foil surface of electrolytic copper foil a yellow stain, some small little yellow trail. We’d better use PVC or other plastics ‘materials to produce water reservoir. The plastic material is non-deformation in low temperature. We can’t use iron or concrete cistern to make water reservoir. Because the electrolytic copper foils production water is specially treated. It might sometimes weakly acidic, sometimes weakly alkaline, iron and cement will be corroded. If the corrosion of iron or cement enter into the water and it will affect the rough of ED copper foil.