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In the demanding world of through-hole technology (THT) assembly, the choice of soldering material directly impacts joint integrity, production throughput, and long-term product reliability. Among the myriad of alloys available, Lead Solder Sn15Pb85 stands as a time-tested workhorse, particularly valued for its unique metallurgical properties that cater specifically to high-temperature, high-stress applications.
This comprehensive product page explores every facet of our premium Lead Solder with Resin Core, available in convenient reel sizes of 100g, 400g, 800g, and 1kg, with a precision diameter of 0.8mm. Whether you are a contract manufacturer handling legacy aerospace components or a repair technician restoring vintage military-grade equipment, understanding the nuances of Lead Solder Pb85Sn15 will elevate your welding outcomes to unparalleled quality standards.
Lead Solder Sn15Pb85, also referred to as Lead Solder Pb85Sn15 or simply Lead Solder Sn15, is a high-lead content alloy consisting of approximately 15% tin and 85% lead by weight. This specific composition diverges significantly from the more common eutectic or near-eutectic solders (like Sn63Pb37) by offering a much higher melting range and superior resistance to thermal fatigue.
The metallurgical behavior of Lead Solder Sn15Pb85 is characterized by a pasty range that spans from approximately 227°C (liquidus) to 288°C (solidus). This wide plastic region makes it exceptionally suitable for step-soldering processes where previously soldered joints must remain intact during subsequent high-temperature operations. For THT Components Welding, this property ensures that connectors, transformers, and large heat-sink components maintain their positional integrity without reflowing during secondary assembly steps.
Our Lead Solder with Resin Core is engineered to deliver consistent, void-free joints through an integrated, non-corrosive flux system. The resin core is activated at the optimal temperature window of Lead Solder Sn15Pb85, ensuring that oxide layers are effectively removed from both the component lead and the plated through-hole (PTH) barrel just milliseconds before the solder wets the surfaces.
Key features include:
Rosin-Based Activation: The resin core provides excellent wetting on oxidized copper, brass, and even tarnished silver-plated leads commonly found in THT Componets.
Low Splatter: Formulated to minimize spitting during the rapid heating phase, preserving the cleanliness of the surrounding PCB.
Post-Process Residue: The residue left by the Lead Solder with Resin Core is electrically safe and can be left in place for non-critical applications, or easily removed with standard saponifiers.
Tape and Reel Packaging: All our products come in precision-wound reels that feed smoothly through automatic wire feeders and hand-held dispensers, reducing downtime and operator fatigue.
Understanding that different production scales require different material volumes, we offer our Lead Solder Sn15Pb85 in four distinct reel weights. This flexibility allows you to match your inventory investment precisely to your consumption rate, minimizing waste and capital tie-up.
Lead Solder Sn15Pb85 100g: This compact reel is the perfect choice for field service kits, laboratory prototyping, and low-volume repair stations. The small footprint fits easily into portable toolboxes while providing enough material for approximately 300-500 standard THT joints (depending on pad size and lead diameter).
Lead Solder Sn15Pb85 400g: The 400g reel serves as the workhorse for mid-size assembly lines and maintenance departments. It offers an optimal balance between handling convenience and extended run-time, reducing spool changeovers while still being manageable for manual operator use.
Lead Solder Sn15Pb85 800g: Designed for high-volume production environments, the 800g reel delivers continuous, uninterrupted welding. This size minimizes the frequency of reel changes, thereby boosting overall equipment effectiveness (OEE) and reducing scrap associated with tail-end material.
Lead Solder Sn15Pb85 1kg: For the highest throughput demands, the Lead Solder Sn15Pb85 1kg option provides maximum value and minimal downtime. This reel is ideal for automated soldering robots and wave soldering top-up systems, ensuring that the alloy composition remains consistent throughout even the longest production shifts.
The specification Lead Solder Sn15Pb85 0.8mm represents the perfect gauge for THT applications. With a diameter of 0.8mm, this wire strikes an ideal equilibrium:
Optimal Feedability: The 0.8mm diameter is rigid enough to feed smoothly through pneumatic and electric soldering irons without buckling, yet soft enough to conform to the varying geometries of THT Componets.
Precise Volume Control: For plated through-hole barrels with a diameter of 0.8mm to 1.2mm, this wire size delivers precisely the right volume of solder to fill the annular ring and form a proper fillet on the solder side of the PCB.
Heat Transfer Efficiency: A 0.8mm wire melts efficiently at the tip of the iron, transferring heat directly to the joint area and reducing the total dwell time – a critical factor when working with heat-sensitive components in THT Components Welding.
Through-hole technology remains irreplaceable for components that require mechanical strength, high power dissipation, or connection to robust external interfaces. Connectors, relays, transformers, electrolytic capacitors, and terminal blocks are archetypal THT Componets that often operate under severe conditions—vibration, thermal cycling, and high current loads.
Lead Solder Sn15Pb85 excels in these scenarios for several reasons:
Creep Resistance: The high lead content provides superior resistance to creep and stress relaxation. Unlike lower-lead alloys that may succumb to grain boundary sliding over time, Lead Solder Pb85Sn15 maintains its mechanical stiffness, ensuring that connector pins do not loosen under vibration.
Thermal Mismatch Accommodation: When soldering large ceramic components or heavy copper terminals to FR4 substrates, the coefficient of thermal expansion (CTE) mismatch can cause joint cracking. The ductility of Lead Solder Sn15 helps absorb these stresses, extending the thermal cycle life of the assembly.
Solderability Over Time: For products with long shelf lives, the Lead Solder with Resin Core preserves its activation energy, providing reliable wetting even when the wire has been stored for extended periods—a distinct advantage over water-soluble or no-clean fluxes that may degrade.
To achieve defect-free joints when using our Lead Solder with Resin Core, operators should adhere to the following process guidelines tailored specifically for THT Components Welding:
Temperature Setting: For Lead Solder Sn15Pb85, set your soldering iron tip temperature between 360°C and 400°C. This elevated temperature compensates for the high liquidus point of the alloy and ensures that the resin core activates fully, producing a bright, shiny fillet.
Dwell Time: Limit contact time to 1.5 – 3 seconds per joint. The 0.8mm diameter wire transfers heat rapidly; prolonged dwell may cause delamination of the plated through-hole or damage to the component body.
Feeding Angle: Introduce the Lead Solder Sn15Pb85 0.8mm wire at a 45-degree angle to the pad, making contact with both the lead and the pad simultaneously. This maximizes flux coverage and promotes uniform wetting across the entire annular ring.
Tip Maintenance: The resin core leaves a slight carbonaceous build-up; clean the tip with a wet sponge or brass wool after every 5-10 joints to maintain optimal thermal transfer.
For engineers and quality managers, the following data provides the empirical foundation for incorporating Lead Solder Sn15Pb85 into your manufacturing process:
| Property | Value |
|---|---|
| Alloy Composition | Sn 14.5 – 15.5%, Pb Balance (84.5 – 85.5%) |
| Melting Range (Solidus – Liquidus) | 227°C – 288°C (440°F – 550°F) |
| Density | Approximately 10.5 g/cm³ |
| Electrical Resistivity | 22 – 23 µΩ·cm |
| Thermal Conductivity | 45 – 48 W/(m·K) |
| Tensile Strength | 38 – 42 MPa |
| Elongation | 25 – 30% |
| Flux Type | Activated Rosin (RMA – Rosin Mildly Activated) |
| Flux Content | 2.5 – 3.0% by weight |
| Halide Content | < 0.05% (compliant with J-STD-004) |
| Copper Mirror Test | Pass (no corrosion) |
| Surface Insulation Resistance (SIR) | > 1 x 10¹² Ω (post-aging) |
This data confirms that Lead Solder Sn15 is not only a high-temperature alloy but also one that maintains electrical integrity in humid or contaminated environments, further cementing its position for mission-critical THT Componets.
To assist in your procurement decision, we provide a side-by-side analysis of the four reel options:
| Feature | Lead Solder Sn15Pb85 100g | Lead Solder Sn15Pb85 400g | Lead Solder Sn15Pb85 800g | Lead Solder Sn15Pb85 1kg |
|---|---|---|---|---|
| Weight | 100g | 400g | 800g | 1kg |
| Reel Diameter | 60 mm | 90 mm | 120 mm | 140 mm |
| Core Size (Inner) | 30 mm | 40 mm | 50 mm | 55 mm |
| Wire Length (approx.) | ~9 meters | ~36 meters | ~72 meters | ~90 meters |
| Best Use Case | Prototyping / Mobile repair | Medium production lines | Large batch assembly | 24/7 automated cells |
| Shelf Life | 36 months | 36 months | 36 months | 36 months |
| Packaging Type | Sealed anti-static bag + desiccant | Sealed anti-static bag + desiccant | Sealed anti-static bag + desiccant | Sealed anti-static bag + desiccant |
Each reel of Lead Solder Sn15Pb85 is wound with constant tension to prevent bird-nesting, ensuring smooth payoff even at high-speed automated welding stations. The labels on each reel clearly display the alloy type (Lead Solder Pb85Sn15), diameter (0.8mm), and net weight, facilitating easy traceability.
While we offer other diameters upon request, the Lead Solder Sn15Pb85 0.8mm standard is overwhelmingly preferred by our customers for the following practical reasons:
Gap Filling: Through-hole gaps typically range from 0.2mm to 0.5mm. The 0.8mm wire melts to fill these interstitial spaces with minimal surface tension, creating a concave fillet that meets IPC Class 2 and Class 3 visual criteria.
Operator Control: Hand soldering operators report that 0.8mm offers tactile feedback—they can "feel" the solder melting and flowing, allowing for precise termination of the feed to prevent excess solder or bridging.
Automation Compatibility: For selective soldering and robotics, the 0.8mm dimension provides the optimal cross-section for precise dosing through narrow nozzles, making it the most versatile choice for THT Componets.
The Lead Solder with Resin Core is not merely a wire with a hole; it is a carefully balanced system. The resin core is formulated from high-grade gum rosin (colophony) with a mild activator that remains dormant at room temperature. Upon heating to the melting range of Lead Solder Sn15Pb85, the activator dissociates to remove copper oxide and tin oxide films, generating a shiny, low-tension molten pool.
Post-soldering, the resin residue forms a transparent, hard film that protects the joint from subsequent oxidation. For applications involving high-impedance circuits, this residue can be left in place; however, for ultra-clean applications such as high-voltage power supplies, the residue is readily soluble in IPA (isopropyl alcohol) or commercial flux removers.
Every batch of Lead Solder Sn15Pb85 undergoes rigorous testing before shipment:
Composition Analysis: Verified via X-Ray Fluorescence (XRF) and Inductively Coupled Plasma (ICP) spectrometry to confirm the Sn15Pb85 ratio within ±0.5%.
Wetting Balance Test: Ensures that the Lead Solder with Resin Core achieves full wetting within 2 seconds at 380°C.
Flux Activity (Solder Spread Test): Checks that the spread factor exceeds 75% on standard copper substrates.
Halide Content: Tested per IPC-TM-650, method 2.3.28, to ensure non-corrosive classification.
Each reel includes a batch-specific Certificate of Conformance (CoC), giving you full traceability back to the raw materials used in the Lead Solder Sn15Pb85 alloy.
To simplify ordering, use the following product codes when requesting a quote for Lead Solder Sn15Pb85:
| Product Code | Description | Weight |
|---|---|---|
| LS-1585-100R | Lead Solder Sn15Pb85 with Resin Core, 0.8mm, Reel | 100g |
| LS-1585-400R | Lead Solder Sn15Pb85 with Resin Core, 0.8mm, Reel | 400g |
| LS-1585-800R | Lead Solder Sn15Pb85 with Resin Core, 0.8mm, Reel | 800g |
| LS-1585-1KR | Lead Solder Sn15Pb85 with Resin Core, 0.8mm, Reel | 1kg |
All products are stocked in our climate-controlled warehouse and are available for same-day dispatch for orders placed before 2 PM local time.
For high-volume OEMs and contract manufacturers, we offer tiered pricing and flexible payment terms. We can also customize the flux percentage or provide the Lead Solder Sn15Pb85 without a core (solid wire) upon special request. Our technical sales team is ready to assist in evaluating your specific THT Componets assembly requirements to recommend the optimal reel size—be it Lead Solder Sn15Pb85 100g for R&D or Lead Solder Sn15Pb85 1kg for full-scale production.
While primarily designed for THT Components Welding, Lead Solder Sn15Pb85 can be used for SMD attachments in mixed-technology assemblies. However, due to its high melting point, it is not recommended for plastic-bodied SMDs that are sensitive to thermal shock. For SMD work, we recommend our lower-temperature alloys.
When stored in its original sealed packaging between 5°C and 35°C with relative humidity below 70%, the Lead Solder with Resin Core has a shelf life of 36 months. Avoid exposure to direct sunlight and sources of ozone.
The high lead content of Lead Solder Pb85Sn15 naturally produces a slightly less reflective surface than tin-rich alloys. However, this appearance is cosmetic and does not indicate a cold joint. The metallurgical structure is fully dendritic and mechanically sound. If a very bright joint is desired, ensure the iron temperature is at the upper end of the range (390°C – 400°C).
Absolutely. The Lead Solder Sn15Pb85 0.8mm dimension is the industry standard for most automatic solder feeders, including those from Ersa, Weller, and Hakko. Our reels are wound with a uniform pitch that prevents jamming in precision feed mechanisms.
"Sn15" is shorthand for the tin percentage in the Lead Solder Sn15 alloy. It is interchangeable with Lead Solder Sn15Pb85 and Lead Solder Pb85Sn15—all refer to the same composition of 15% tin and 85% lead.
In the landscape of electronic assembly, the choice of solder wire is a strategic decision that influences yield, longevity, and field performance. Our Lead Solder Sn15Pb85 offers a compelling blend of high-temperature resilience, mechanical toughness, and process stability that is unmatched by standard alloys.
By offering this material in reels of Lead Solder Sn15Pb85 100g, Lead Solder Sn15Pb85 400g, Lead Solder Sn15Pb85 800g, and Lead Solder Sn15Pb85 1kg, we ensure that whether you are a small repair shop or a global electronics manufacturer, you can access the exact volume you need. The precision Lead Solder Sn15Pb85 0.8mm diameter ensures optimal feeding and joint formation for THT Componets, while the integrated Lead Solder with Resin Core guarantees activation reliability and post-assembly cleanliness.
We invite you to contact our technical support team to request free samples of the Lead Solder for THT Componets and experience the difference that a premium high-lead solder can make in your welding operations. Invest in quality, invest in reliability—choose our Lead Solder Sn15Pb85 for your most critical assemblies.
Contact us:
Email: xfsolder@163.com or xfsolder@gmail.com
WhatsApp/Wechat: +8613450770997
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