Description
Product Overview
The Wonderway Sn63/Pb37 T4 solder paste is engineered for precision soldering tasks that demand a stable melting point, clean operation, and consistent flow characteristics. With a certified melting point of 183 °C, this alloy provides a predictable thermal profile that helps prevent overheating of delicate components while ensuring a solid metallurgical bond. The composition consists of 63 % tin and 37 % lead, a classic eutectic blend that offers excellent wetting ability and a smooth, bright solder joint. Integrated within the paste is a 10.5 % flux system that activates upon heating, removing oxides and promoting adhesion without leaving corrosive residues, thanks to its no‑clean formulation. Each package contains four 30 g cartridges, totaling 120 g of high‑performance solder paste, conveniently sized for both small‑scale prototyping and larger production runs. The paste exhibits a strong viscosity that resists sagging during placement, yet flows readily under the heat of a reflow oven or soldering iron, delivering uniform coverage across pads and leads. Dimensions of the cartridge (3.73 × 1.35 × 0.92 in) and a lightweight design (6 oz) make handling and storage straightforward, while the product complies with industry safety standards, including the California Proposition 65 warning for lead content.
Usage
This solder paste is suited for a wide range of electronic assembly applications, from hobbyist circuit board repairs to professional manufacturing environments. It performs exceptionally well in surface‑mount technology (SMT) processes, where precise deposition and rapid reflow are critical. The no‑clean flux eliminates the need for post‑solder cleaning, reducing production time and minimizing the risk of component damage from aggressive cleaning agents. Users can apply the paste using a syringe dispenser, stencil printing, or manual brushing, depending on the complexity of the board layout. The strong viscosity ensures that the paste stays in place during component placement, even on vertical or inclined surfaces, making it ideal for connectors, transformers, and power modules that experience mechanical stress. Additionally, the alloy’s low melting point relative to higher‑temperature solders helps protect temperature‑sensitive components such as electrolytic capacitors, LEDs, and certain semiconductor devices. Whether you are assembling a prototype board, repairing a damaged PCB, or conducting small‑batch production, this paste delivers reliable joints with minimal effort.
Why Choose Us
Choosing Wonderway means selecting a partner committed to quality, consistency, and customer satisfaction. Our solder paste undergoes rigorous quality control testing, including viscosity measurement, flux activity verification, and thermal analysis, to guarantee that each batch meets the exact specifications required for high‑reliability soldering. The no‑clean formulation is formulated to meet IPC standards, ensuring that residues do not compromise the electrical performance or long‑term reliability of the assembled device. We also provide comprehensive technical support, offering guidance on paste storage, handling, and optimal reflow profiles to help users achieve the best results. Our packaging design minimizes waste and exposure to contaminants, and the included safety information complies with global regulations, giving you confidence in both performance and compliance. Moreover, Wonderway’s dedication to continuous improvement means we regularly update our formulations based on feedback from engineers and technicians, keeping our products at the forefront of soldering technology.
Key Features
- Consistent 183 °C melting point ensures reliable thermal performance across all soldering processes.
- No‑clean flux eliminates post‑solder cleaning, saving time and reducing material costs.
- Strong viscosity provides precise placement and prevents sagging, even on vertical components.
- Balanced 63 % Sn / 37 % Pb alloy delivers bright, durable joints with excellent wetting.
- Dedicated technical support and after‑sales service help you troubleshoot and optimize soldering results.
FAQ
What temperature profile should I use for reflow with this paste?
We recommend a standard lead‑based reflow profile: pre‑heat to 150 °C, soak at 180 °C for 60–90 seconds, then peak at 230 °C for 30–45 seconds before cooling. Adjust the peak temperature slightly if you are working with components that have lower temperature tolerances.
Is the paste safe to store long‑term?
Yes, the paste can be stored for up to 12 months when kept in a cool, dry environment (ideally 15–25 °C) and sealed tightly after each use. Avoid exposure to extreme temperatures or humidity, which can affect viscosity and flux activity.
Can I use this solder paste for lead‑free applications?
This specific formulation contains lead and is intended for lead‑based soldering. For lead‑free requirements, we offer a separate line of Sn99.3 Cu0.7 solder paste that meets RoHS standards.
What safety precautions should I take when handling this product?
Because the paste contains lead, wear appropriate personal protective equipment such as gloves and safety glasses. Work in a well‑ventilated area, and follow the Proposition 65 warning guidelines. Dispose of any waste according to local hazardous material regulations.
How do I achieve the best wetting on fine‑pitch components?
Use a fine‑mesh stencil (typically 100 µm) to apply a thin, uniform layer of paste. Ensure the board is clean and free of oxidation before printing, and maintain the recommended reflow temperature profile to activate the flux fully without overheating the pads.
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