Brazing strip

The choice depends on the base metals being joined. Common types include Silver-based (Ag) for high strength and conductivity, Copper-Phosphorus (Cu-P) for copper-to-copper joints without flux, and Aluminum-Silicon (Al-Si) for lightweight applications. Ensure the melting range (solidus and liquidus temperatures) is at least 50°C lower than the melting point of your base metal to prevent structural damage.

For global trade, prioritize suppliers compliant with AWS A5.8 (American Welding Society) or ISO 17672 standards. If the strips are used in electronics, they must meet RoHS (Restriction of Hazardous Substances) and REACH requirements to ensure they are lead-free and cadmium-free, which is critical for entering the EU and US markets.

B2B buyers should specify thickness tolerances (typically ±0.02mm) and width consistency to prevent jamming in automated feeding systems. Request information on the surface finish; a clean, oxide-free surface is vital for optimal wetting and capillary action during the brazing process.

Key indicators include capillary flow characteristics, joint tensile strength, and corrosion resistance. Ask for metallographic analysis reports to check for impurities. High-quality strips should provide a smooth, leak-proof bond that can withstand the thermal expansion cycles of the final application, such as in HVAC or automotive heat exchangers.

Always request a Material Test Report (MTR) or a Certificate of Analysis (COA) for every batch. Utilize third-party inspection services (like SGS or Intertek) to perform a chemical composition analysis before the balance payment is made. On Made-in-China.com, look for Audited Suppliers to ensure the factory has been physically verified.

Since brazing strips often contain precious metals like silver, prices fluctuate with London Metal Exchange (LME) rates. Negotiate a formula-based pricing model linked to market spot prices. For MOQs, if you are a new buyer, suggest a paid sample trial of 5-10kg before committing to a large-scale industrial volume to verify compatibility with your machinery.

Brazing strips are sensitive to oxidation and moisture. Ensure the contract specifies vacuum-sealed packaging with desiccant silica gel packs. For sea freight, use wooden crates with palletization to prevent bending or mechanical deformation. Clearly mark the H.S. Code (typically 7408 for copper-based or 7106 for silver-based) to avoid customs clearance delays.

Use Secured Trading Services provided by platforms like Made-in-China.com to protect your payment until shipping documents are verified. Avoid direct wire transfers to private accounts; always use the company’s official corporate bank account as listed in their verified business license.