Lead-Free Solder Wire SN99.3 Cu0.7 | 50g Flux Core Reel

Lead-Free Solder Wire SN99.3 Cu0.7 – High Purity Flux Core Reel

Upgrade your soldering projects with this environmentally friendly, lead-free solder wire. Formulated with 99.3% Tin (Sn) and 0.7% Copper (Cu), this high-purity wire is RoHS compliant and designed for clean, reliable joints every time — ideal for electronics repair, PCB work, IC repair, and general electrical work.

Key Features

• Lead-Free Formula: SN99.3/Cu0.7 composition — RoHS certified and environmentally safe
• 2% Rosin Flux Core: Built-in flux activates on contact to clean oxide layers and promote excellent wetting for strong, reliable solder joints
• Low Spatter & Smoke: Engineered for minimal fume and spatter generation, making soldering more comfortable in enclosed workspaces
• Multiple Diameter Options: Available in 0.5mm, 0.6mm, 0.8mm, and 1.0mm to suit fine-detail work or heavier connections
• High Purity Tin: Ensures excellent electrical conductivity, non-corrosive joints, and strong insulation resistance
• Wide Application: Suitable for electrical repair, circuit boards, IC components, electronics assembly, and hobbyist projects
• Melting Point: 227°C — compatible with most standard soldering irons
• 50g Reel (1.76 oz): Compact and easy to handle; other weights available in our store

Specifications

Why Go Lead-Free?

Lead-free soldering is now the industry standard for consumer electronics and is required by RoHS regulations across many markets. By switching to a lead-free alloy like SN99.3/Cu0.7, you reduce exposure to hazardous lead fumes while still achieving professional-grade joints. Learn more about safe soldering practices and hazardous substance reduction from the U.S. EPA Lead Information page.

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Frequently Asked Questions

Q: What is the difference between SN99.3 Cu0.7 lead-free solder and standard lead solder?

A: SN99.3 Cu0.7 is a lead-free alloy composed of 99.3% tin and 0.7% copper. Unlike traditional tin-lead (SnPb) solder, it contains no lead, making it RoHS compliant and safer for both the user and the environment. It has a slightly higher melting point (227°C vs ~183°C for 60/40 SnPb), but produces equally strong and reliable electrical joints.

Q: What wire diameter should I choose for electronics or IC repair?

A: For fine-pitch electronics, SMD components, or IC repair, the 0.5mm or 0.6mm diameter is recommended for precision control. The 0.8mm wire is a great all-rounder for general PCB work, while the 1.0mm diameter is better suited for larger joints, through-hole components, or wiring connections.

Q: Does this solder wire require additional flux?

A: No. This solder wire features a 2% rosin flux core built right in, which activates during soldering to clean oxidation from metal surfaces and improve solder flow. For most electronics repair and assembly tasks, no additional flux is needed, though extra flux paste can be added for particularly stubborn or oxidised joints.

Q: Is this solder wire safe to use indoors?

A: Yes — this lead-free solder wire is formulated to produce less smoke and fewer fumes compared to leaded solder. However, it is always best practice to solder in a well-ventilated area or use a fume extractor, especially during prolonged use. The absence of lead significantly reduces the risk of toxic fume exposure.