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BCu-100 Pure Copper Solder Paste · AWS BCu-1
High-Temperature Brazing · Electrical and Thermal Conductivity · Specialized for Vacuum/Protective-Atmosphere Brazing 200 mesh / 300 mesh
Process Advantages
High purity
Selected high-purity electrolytic copper raw material, with a high copper content and low impurity levels, ensuring clean and reliable weld joints.
Excellent electrical and thermal conductivity
The pure copper composition imparts excellent electrical and thermal conductivity to the solder paste, making it suitable for high‑performance applications such as electrical contacts and heat‑dissipation systems.
High-strength welding
The weld joint exhibits stable mechanical properties and high load-bearing capacity; in some cases, the strength of pure copper welds can approach that of the base metal itself.
Flexibly customizable granularity
Supports powder particle-size classification and customized solder paste viscosity, compatible with a variety of processes including flame brazing, furnace brazing, induction brazing, and vacuum brazing.
Product Real-World Photos & Microscopic Morphology
Actual photos of solder paste
BCu-100 pure copper solder paste: the paste is uniform, does not delaminate or form lumps, and has moderate viscosity with excellent flowability.
Brazed joint
Stainless steel/high-temperature alloy vacuum brazed joints exhibit full, rounded welds that are dense and free of defects.
Powder microstructure
Non‑vacuum atomized pure copper powder, available in irregular or near‑spherical morphologies to meet diverse process requirements.
Regarding BCu-100 Pure Copper Solder Paste
BCu-100 (corresponding to the Chinese national standard BCu100A and AWS BCu-1) is a copper-based high‑temperature brazing paste, with high‑purity copper as its principal component, containing ≥99.9% copper. This product is prepared by uniformly blending ultra‑high‑purity copper powder—produced via non‑vacuum atomization—with an organic binder. It features a high melting point (1083°C), excellent high‑temperature stability, and superior fluidity, making it particularly well suited for furnace brazing under protective atmospheres (such as hydrogen or argon) and for vacuum brazing. Compared with silver‑based or phosphorus‑copper brazing alloys, BCu‑100–based pure copper braze joints offer superior electrical conductivity, thermal conductivity, and corrosion resistance, while also being more cost‑effective, thus representing an economical choice for high‑temperature electrical connections and copper‑to‑copper joints.
BCu-100 can serve as a joining medium for materials such as copper and copper alloys, stainless steel, carbon steel, high‑temperature alloys, and nickel‑based alloys. During brazing, copper‑based fluxes—such as borax‑based fluxes FB102 and FB103—are required to help remove oxides and enhance the braze alloy’s wettability and fluidity. The typical brazing temperature ranges from 1093 to 1149°C, slightly above copper’s melting point. Post‑brazing stress‑relief annealing is recommended to eliminate thermal stresses and ensure dimensional stability and long‑term reliability of the component. Brazing under a hydrogen or vacuum atmosphere is particularly advised, as it eliminates the need for flux and yields welds that are cleaner and more dense.
TIJO employs a non‑vacuum atomization process to produce high‑purity BCu‑100 copper powder, primarily offering 200‑mesh and 300‑mesh grades. The powder morphology can be customized to either irregular or near‑spherical shapes, with a loose bulk density of ≥3.0 g/cm³ and an oxygen content of ≤0.1%. The product complies with GB/T 5246, AWS A5.7, and ISO 17672 standards, and is compatible with vacuum brazing, induction brazing, flame brazing, furnace brazing, and electron‑beam brazing processes. It finds extensive applications in power and electrical engineering, refrigeration equipment, cemented carbide tools, aerospace, the automotive industry, and electronic packaging, among others.
Typical Chemical Composition (wt%)
| element | Cu | Fe | Zn | Pb | Al | P | Sn | O |
|---|---|---|---|---|---|---|---|---|
| Standard value* | Margin | ≤0.02 | ≤0.02 | ≤0.01 | ≤0.01 | ≤0.05 | ≤0.02 | ≤0.1 |
| Typical measured values | Margin | 0.005 | 0.005 | <0.005 | <0.005 | 0.01 | <0.005 | 0.06 |
* Data are based on TIJO corporate standards and the typical values for the BCu100 alloy grade, in compliance with GB/T 5246. Oxygen content is ≤0.1%, ensuring excellent oxidation resistance during brazing. Impurity elements are tightly controlled at the ppm level, guaranteeing weld seam purity and welding reliability.
Physical Properties & Specification Parameters
| Parameter item | Technical indicators |
|---|---|
| Grade | BCu100 (BCu-1) |
| Melting point (solidus/liquidus) | 1083℃ / 1083℃ |
| Brazing temperature range | 1093-1149℃ |
| Powder morphology | Irregular shape/spherical (customizable) |
| Loose packing density | ≥3.0 g/cm³ |
| Screening particle size (mesh count) | 200 mesh / 300 mesh |
| Product form | Powder / Paste |
| Packaging Specifications | Aluminum foil bags, iron drums, plastic buckets, woven bags, pallets, custom packaging |
| Delivery time | 3–15 days |
* Supports granular customization and paste viscosity adjustment, enabling personalized configuration tailored to customers’ brazing equipment and process parameters.
End-to-end testing capability
Each batch of product undergoes comprehensive inspection for composition, particle size, oxygen content, and flowability, ensuring that the solder paste meets the stringent quality requirements of vacuum brazing, induction brazing, and furnace brazing. A fully traceable Certificate of Analysis (COA) is provided for every batch.
Typical application scenarios
Power and Electrical Engineering
Conductive connection applications such as busbars, transformers, switch contacts, and high-temperature connectors in high-voltage transmission systems.
Refrigeration equipment
Air conditioner condenser, refrigerator evaporator, brazing of copper tubes and fittings for heat exchangers, and refrigeration piping connections.
Carbide tools
The carbide cutting tip is joined to the steel body via high-temperature brazing, resulting in high joint strength and excellent heat resistance.
Aerospace
Brazed joints for high-temperature engine components, hot-end assemblies of gas turbines, and aerospace structural parts.
Mechanical manufacturing
Welding of stainless steel–carbon steel composite structural components, copper and copper alloy structural components, and high-temperature alloy assemblies.
Automotive industry
Automotive radiators, heat exchangers, high-voltage copper busbars for batteries, and electrical connection components for new-energy vehicles.
Electronic packaging
Integrated circuit lead frames, heat-sink substrates for power semiconductor modules, and vacuum electronic device packages
Dissimilar Material Welding
Reliable joining of dissimilar metallic materials such as copper–stainless steel, copper–nickel-based alloys, and copper–carbon steel.
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, 50 kg per drum
Export packaging
Export orders are packed in wooden crates or palletized 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 5–7 days after order confirmation.
Custom particle size or minor formulation adjustments: 7–15 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)
Free sample
Free samples are provided for process validation.
Small-batch samples; bulk supply upon quality confirmation.
Customized Services
Particle size customization, paste viscosity adjustment
Meets special operating conditions and equipment requirements
Shipping documents
COA, MSDS, ingredient list, packing list
Meets export customs clearance requirements and customer in-plant inspection standards.
Technical Support
Provide guidance on brazing process parameters.
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.
