2-2-1 Product Introduction

Lead-free & halogen-free solder paste is an environmentally friendly, high-reliability soldering material for surface mount technology (SMT). It is uniformly blended from lead-free solder alloy powder and halogen-free flux. Free of lead and halogen-based activators, it complies with environmental regulations while ensuring long-term safe operation of precision electronic products.

I. Basic Composition

A. Solder Powder

Mainstream alloys are tin‑silver‑copper (SAC305/SAC0307). Low-temperature SnBi and high-temperature SnSb systems are also available, with melting points ranging from 138°C to 230°C, and completely lead‑free.

B. Flux

Free of halogens such as chlorine and bromine. Formulated with organic acids and non-ionic activators to achieve non-corrosiveness, low residue, and high insulation.

II. Product Features

1. Environmental ComplianceMeets RoHS, REACH, and halogen-free requirements (IEC 61249). Lead content < 1000 ppm, with total halogens controlled at an extremely low level, suitable for high-end products.

2. Stable Soldering PerformanceExcellent wettability, full solder deposition, bright solder joints, and low voiding rate. Suitable for precision components including 0201, 01005, BGA, and QFN.

3. Low Residue & No-CleanMinimal and transparent insulating residues after soldering. Allows direct ICT testing and conformal coating without cleaning, simplifying the production process.

4. High Reliability & Non-CorrosivenessHalogen‑free, eliminating ionic contamination, electrochemical migration, and copper foil corrosion. No leakage or cold joints during long-term use, ideal for automotive, medical, and industrial control equipment.

5. Excellent PrintabilityHigh thixotropy, enabling continuous printing without stencil clogging or slumping, suitable for high-speed SMT production lines.

III. Application Fields

• Automotive electronics (ECUs, lamps, sensors)

• Medical equipment and precision instruments

• Telecommunication base stations, servers, 5G equipment

• High-end consumer electronics, industrial control motherboards

• Aerospace and military-grade high-reliability products

IV. Differences from Conventional Solder Pastes

• More environmentally friendly than lead-containing solder paste, with no lead toxicity hazards.

• Safer than halogen-containing lead-free solder paste, with no risk of ionic corrosion and higher long-term reliability.

2-2-2 Designation, Melting Point and Alloy Compositions

2-2-3 Flux Chemical Composition

2-2-4 Properties