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Rohs Environmental Tin Bismuth Sn42bi58 Solder Wire. Lead-Free Composition: Sn42Bi58 alloy ensures environmental friendliness and safety. High Purity Materials: Refined from pure tin, sterling silver, and pure copper with low impurities. Excellent Wettability: Smooth surface and good melt flow for bright solder joints. Low Smoke & Odor: No toxic gases, healthy for operators during soldering. Multiple Wire Diameters: Available in 0.5mm to 2.0mm for various applications. Stable Quality: High anti-oxidation performance with evenly distributed flux. Manufacturer Direct: 20 years of experience with professional sales and R&D support.