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BAg45CuZnSn silver-copper-zinc-tin brazing filler metal · AWS BAg-36
High silver content · Excellent wetting · Available in both powder and paste forms -200 mesh / -300 mesh
Process Advantages
Excellent wettability · High fluidity
The tin‑containing formulation effectively reduces surface tension, exhibits excellent wetting and spreading on stainless steel, cemented carbides, and copper alloys, and delivers outstanding gap‑filling performance.
High bonding strength
The brazed joint exhibits excellent densification, high joint strength, and superior resistance to thermal cycling and corrosion, making it well suited for high-reliability joining applications.
Medium-Temperature Brazing · Base-Material Friendly
The brazing temperature is moderate, lower than that of high-silver brazing alloys, effectively reducing the risk of overheating and grain coarsening in the base material.
Dual Form · Process Compatibility
The powder form (−200/−300 mesh) is suitable for automated powder feeding and laser cladding; the paste form can be used for dispensing and screen printing, and is ready to use straight out of the container.
Product Real-World Photos & Microscopic Morphology
Powder SEM (-300 mesh)
Spherical or near-spherical particles with uniform particle size and excellent flowability.
Real-life photo of powdered brazing filler metal
Yellowish-brown powder, packaged in vacuum-sealed aluminum foil bags or plastic canisters.
Real-life photo of paste-type solder alloy
Syringe/plastic can packaging, stable viscosity, optional no‑clean formulation.
BAg45CuZnSn high-silver, tin-containing silver-based brazing alloy
BAg45CuZnSn is a silver‑copper‑zinc‑tin brazing alloy containing 44–46% silver, compliant with AWS A5.8 BAg‑36 and ISO 17672 Ag145 standards. Compared with conventional BAg45CuZn (low‑silver) brazing alloys, the addition of tin lowers the liquidus temperature from 720°C to 680°C, resulting in a lower melting point and a moderate brazing range of 677–813°C. This helps minimize the risk of overheating and grain coarsening in the base materials. Moreover, tin significantly reduces surface tension, greatly enhancing wetting and spreading on stainless steel, cemented carbides, copper alloys, and dissimilar materials. The alloy exhibits excellent gap‑filling capability, produces well‑filled brazed joints, and ensures strong bonding.
This alloy brazed joint exhibits high tensile strength, excellent electrical and thermal conductivity, and superior corrosion resistance, enabling long-term service under high-temperature, corrosive, and thermal-cycling conditions, making it well suited for applications requiring high reliability. The powdered product is manufactured via non‑vacuum gas atomization combined with precision sieving, available in two grades: −200 mesh (≤75 μm) and −300 mesh (≤48 μm), with outstanding flowability and compatibility with automated powder feeding, laser cladding, and pre‑formed foil pressing. The paste formulation blends the powder with an organic binder, achieving a solid content of 80–90% and exhibiting excellent thixotropy, making it ideal for automated dispensing, screen printing, and manual coating; viscosity can be tailored to meet the specific requirements of the customer’s equipment.
TIJO offers BAg45CuZnSn in two forms—powder (-200 mesh, -300 mesh) and paste—to meet the requirements of various brazing processes. Each batch is accompanied by a Certificate of Analysis (COA), with particle size precisely controllable and custom specifications available. The product complies with RoHS environmental standards and is widely used in electronic packaging, the refrigeration industry, cemented carbide tools, medical devices, the automotive sector, and precision instrumentation, serving as a reliable solution for high‑end precision brazing of stainless steels and dissimilar materials.
💡 Sample Description: Due to the relatively high price of silver-based brazing filler metal, this product does not offer free samples. We do provide small‑quantity powder and solder paste samples in 50 g, 100 g, 500 g, and other weights; please contact our sales team for sample pricing inquiries.
Chemical Composition (wt%, powder)
| Grade | Ag | Cu | Zn | Sn | Solidus (°C) | Liquidus temperature (°C) | Brazing temperature (°C) |
|---|---|---|---|---|---|---|---|
| BAg45CuZnSn | 44-46 | 26-28 | 23.5-27.5 | 2.0-3.0 | 640 | 680 | 677-813 |
* Complies with AWS BAg-36 and meets RoHS requirements. Powder specifications: -200 mesh, -300 mesh; custom particle sizes available. Data is subject to the batch COA report; third-party testing is supported.
Solder Paste Specifications
| Grade | Alloy powder content (wt%) | Binder (wt%) | Solidus (°C) | Liquidus temperature (°C) | Viscosity (Pa·s) | Recommended Process |
|---|---|---|---|---|---|---|
| BAg45CuZnSn solder paste | 80-90 | Margin | 640 | 680 | 50-200 | Automatic dispensing, screen printing, manual application |
* Solder paste viscosity can be customized to meet customer equipment and process requirements; store refrigerated, with a shelf life of 6 months.
Reference for BAg45CuZnSn Brazing Process
| Base material combination | Recommended Brazing Temperature (°C) | Flux/Atmosphere | Joint strength |
|---|---|---|---|
| Stainless steel - stainless steel | 730-780 | FB102 / Argon/Vacuum | Excellent |
| Stainless steel–copper | 700-760 | FB102 / Argon gas | Excellent |
| Cemented carbide–steel | 740-800 | FB104 / Vacuum | Excellent |
| Copper alloy - copper alloy | 680-730 | FB102 / Nitrogen | Excellent |
* It is recommended to use a flux specifically designed for silver brazing; vacuum or inert-gas atmosphere protection yields the best joint quality.
BAg45CuZnSn vs. traditional BAg45CuZn
| Performance Comparison | BAg45CuZnSn (containing Sn) | BAg45CuZn (Sn-free) |
|---|---|---|
| Liquidus temperature (°C) | 680 | 720 |
| Wettability (on stainless steel) | ✓ Significant improvement | Good |
| Caulking ability | ✓ Better | General |
| Brazing seam toughness | ✓ Improve | Medium |
| Liquidity | ✓ Excellent | Good |
The addition of tin lowers the melting point and enhances the wettability of BAg45CuZnSn while maintaining its high silver content, making it particularly well suited for brazing stainless steel and dissimilar materials.
Powdered brazing filler metal (-200 mesh / -300 mesh)
- Excellent flowability, suitable for automatic powder feeding.
- Can be directly sprinkled as powder or pressed into preformed solder tabs.
- Vacuum-packed, with a long shelf life.
- Can be blended with other metal powders to formulate special compositions.
Paste-type brazing filler metal (ready-to-use)
- Ready to use straight from the can—no need to mix powder and adhesive on site.
- Excellent thixotropy, precise dispensing/printing, and no sagging.
- The carrier volatilizes completely, leaving minimal residue.
- Viscosity is adjustable, making it compatible with various dispensing equipment and manual coating processes.
Typical application areas
Electronic packaging
Semiconductor chips, vacuum tube components, electrical contacts, precision connectors
Refrigeration industry
Automated welding of compressor piping, condensers, and heat exchangers
Carbide cutting tools
High-strength bonding of cutting tools, drill bits, and dies to steel substrates
Medical device
Stainless steel instruments, miniature components, brazing in an oxygen-free environment
Automotive industry
Sensors, heat exchangers, fuel line fittings
Precision instruments
Instrument components, optical devices, robotic joints
End-to-end testing capability
Each batch of BAg45CuZnSn powder and solder paste is tested for chemical composition (Ag, Cu, Zn, Sn), particle size distribution, oxygen content, flowability, and tapped density, with a Certificate of Analysis (COA) provided.
Packaging & Delivery
Powder packaging
Vacuum-sealed in a double-layer aluminum foil pouch (to prevent oxidation), with an outer iron or plastic drum.
Specifications: 1 kg, 5 kg, 10 kg, 25 kg per drum
Solder paste packaging
Syringes (10 cc/30 cc/50 cc) or plastic containers (100 g/500 g/1 kg)
Refrigerate; shelf life: 6 months.
Export packaging
Export orders are packed in wooden crates or pallets and reinforced to protect against moisture and impact.
Compatible with sea, air, and international express shipping.
Delivery time
Standard particle size in stock; ships within 2–4 days after order confirmation.
Solder paste customization or particle size fine-tuning: 3–7 days
Batch Traceability
For each batch, a sample is retained, and the COA report is shipped with the goods.
Supports third-party testing (e.g., SGS)
Small-gramage sample
Supports the purchase of 50 g, 100 g, and 500 g samples of powders and solder pastes.
Due to the high price of silver-based brazing filler metal, free samples are not available; trial samples must be purchased.
Customized Services
Particle size customization, solder paste viscosity adjustment
Meets special operating conditions and equipment requirements
Technical Support
Providing brazing process parameters and solder paste application guidelines.
Assist in resolving issues encountered during use.
Inquire Now for Free Samples
Fill out the form on the right or contact us directly; we will provide product samples, technical data sheets, and price quotes to help you quickly complete your additive manufacturing process validation.
Address: No.39, Liandong Yougu lnd. Park, Bachelor Street,Changsha City,Hunan Province, China.
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Address: No.39, Liandong Yougu lnd. Park, Bachelor Street,Changsha City,Hunan Province, China.
