Why does SS304 welded mesh require pickling and polishing for food drying applications?
2026/04/13
Pickling removes welding scale and heat tint, restoring the chromium-oxide protective layer. Under drying conditions, residual impurities pose heavy metal leaching risks and facilitate bacterial growth. Electropolishing achieves a surface roughness of Ra < 0.8mu m, meeting FDA/NSF hygiene standards for food-contact materials.
