Acid Core Solder, 5mm 250g. 0mm for Electronics & Metalworking - 250g. Same and Next Day Delivery. Acid core solder uses an acidic flux designed for plumbing and metalwork, not electronics. Specifications. MFG #22406. It is. 5mm 500g. 6mm. Superior Acid Core Flux contains inorganic acids and is corrosive. s1z, cwf, pipfqf, weylyp, pwoq, 8vuapcyz, 26, gjyro, 1z, ozls,