What Is the Marking for Lead-Free Solder Wire?

Lead-Free, Environmentally Friendly Solder Wire

In the soldering field, influenced by environmental protection requirements, lead-based solder wire is gradually being replaced by environmentally friendly lead-free solder wire. Among them, lead-free solder wire is favored in fields such as electronics soldering in Shenzhen and Guangzhou due to its compliance with environmental standards and high adaptability. How to determine whether solder wire is lead-free? What are the key factors for identifying certification and composition markings for lead-free solder wire? Below, Singway will explore the markings for lead-free solder wire with you.

Proof That Lead-Free Solder Wire Meets Environmental Standards

The lead-free solder wire certification mark is an important proof of compliance with environmental standards and a core basis for compliant production and product qualification. Environmentally friendly lead-free solder wire must have the following certifications:

(1) RoHS Certification Mark
This is the most common and core environmental certification. The EU RoHS environmental certification is marked with the "RoHS" label. RoHS strictly limits the content of six hazardous substances, including lead, cadmium, and mercury, with lead content ≤1000 ppm. Solder wire that meets this certification can be recognized as environmentally friendly lead-free solder wire. For example, high-quality environmentally friendly lead-free solder wire on the market will clearly display the RoHS certification mark on its packaging.

(2) SGS Test Mark
SGS is an internationally recognized testing agency. Lead-free solder wire that has passed SGS testing will bear the "SGS" mark along with a test report number, which can be queried on the official website to verify that lead content and other indicators meet lead-free standards. For common specifications such as 1.0mm lead-free solder wire, the SGS test report also details the solder wire's batch number, alloy composition, and other details, ensuring product quality.

(3) National Standard Mark
Products that comply with China's industry standard SJ/T 11392-2019 "Lead-Free Solder — Chemical Composition and Form" may bear the standard number. This standard specifies the marking, classification, and chemical composition requirements for lead-free solder, serving as a core basis for the production and testing of lead-free solder wire in China. Products marked with this standard number offer greater assurance of lead-free compliance.

Alloy Composition Marking
The core alloy composition of lead-free solder wire is mainly tin (Sn), combined with elements such as copper (Cu) and silver (Ag). Lead-free solder that meets RoHS certification often has its alloy composition and ratio marked on the product packaging or test reports, indirectly confirming its lead-free nature.

Today, environmentally friendly lead-free solder wire has become an inevitable choice in the soldering field. If you have more questions about environmentally friendly lead-free solder wire, feel free to consult Singway Solder Wire!