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When it comes to reliable, high-integrity electronic assemblies, the choice of soldering material is critical. Whether you are a professional PCB assembler, a repair technician, or a prototyping engineer, you need a solder that flows smoothly, creates strong joints, and works consistently across thousands of pads. Our Lead Solder Sn40Pb60 40/60 delivers exactly that – a perfect blend of traditional tin-lead metallurgy optimized for manual and semi-automatic soldering tasks.
This product is a Lead Solder for Electronics with a built-in resin flux core. The 40% tin / 60% lead composition provides a wide plastic range (183°C–238°C melting point), making it exceptionally forgiving for hand soldering. Available in multiple spool weights – Lead Solder 100g, Lead Solder 200g, Lead Solder 250g, and Lead Solder 500g – and a precise Lead Solder 0.8mm diameter, this series meets every production volume requirement.
Below we break down the technical specifications, application advantages, flux core benefits, weight options, and storage recommendations. Read on to understand why this Lead Solder for PCB assembly remains the industry’s trusted workhorse.
Lead Solder Sn40Pb60 is a eutectic-like alloy that has been used for decades in commercial and hobbyist electronics. While not true eutectic (63/37), the Lead Solder 40 60 composition offers several distinct advantages:
Melting range: 183°C liquidus / 238°C solidus – wide plastic zone allows repositioning components.
Wetting performance: Excellent on copper, tin, and nickel surfaces.
Joint strength: High tensile strength (approx. 45 MPa) and good creep resistance.
Flux core: Rosin-based resin flux (R or RMA grade) – non-corrosive, electrically safe.
This Lead Solder for Electronics is specifically formulated to reduce dross formation and spattering. The Lead Solder 0.8mm diameter is the most versatile size for through-hole components, large IC pins, and fine-pitch connectors.
We understand that different projects demand different solder quantities. That’s why this Lead Solder Sn40Pb60 is offered in four popular spool weights:
The Lead Solder 100g spool is the perfect entry size for engineers, educators, and mobile technicians. Its lightweight spool fits easily into a portable toolkit. With 100g of Lead Solder 40 60, you can solder approximately 3000–4000 average through-hole joints (depending on pad size). This size is also great for small-batch PCB assembly and rework stations.
For regular workshop use and small-scale manufacturing, the Lead Solder 200g spool offers extended runtime without being overly heavy. Many PCB assembly houses choose Lead Solder 200g as their standard hand-soldering consumable because it balances cost and usability. At 200g, you reduce spool-change downtime while maintaining excellent feed control.
The Lead Solder 250g option is a sweet spot for medium-volume electronics repair centers and educational labs. It provides 25% more material than the 200g version at only a marginal price increase. If your team goes through Lead Solder for PCB daily, the 250g spool reduces packaging waste and per-gram cost. It still fits standard solder spool holders.
When throughput matters, choose the Lead Solder 500g spool. Designed for high-mix assembly lines and heavy-duty soldering stations, 500g of Lead Solder Sn40Pb60 supports continuous operation for days. This size is also the most economical per gram. Many contract manufacturers prefer Lead Solder 500g for wave soldering touch-up and selective soldering operations.
A precise diameter ensures consistent wire feed and heat transfer. Our Lead Solder 0.8mm is the industry standard for general electronics PCB assembly. Here’s why:
Through-hole components: Perfect for resistors, capacitors, connectors, and relays with 0.5mm–1.0mm lead diameters.
Large pads: Enough cross-section to deliver sufficient flux and solder volume without flooding the joint.
Fine-pitch ICs (limited): While 0.8mm is not for ultra-fine SMT (0.3mm–0.5mm is better), it works well for SOIC, PLCC, and larger SOT packages.
Heat management: Thicker than 0.5mm, reducing wire feed speed and operator fatigue.
When you use Lead Solder 0.8mm with a quality temperature-controlled iron (320°C–360°C), you achieve shiny, concave fillets in 1–2 seconds per joint. The Lead Solder for Electronics with 0.8mm diameter also minimizes spatter because the flux core is well-proportioned.
Many low-quality solders use acid or water-soluble fluxes that leave conductive residues. Our Lead Solder Sn40Pb60 incorporates a premium resin flux core (colophony-based, non-halide activated). This brings unique benefits to Lead Solder for PCB applications:
Immediate oxide removal: The resin activates at soldering temperature (180°C–200°C), cleaning copper pads and component leads.
No post-solder cleaning required for most applications: Residues are non-corrosive and high-impedance – safe for digital and analog circuits.
Excellent wetting: The flux reduces surface tension of molten Lead Solder 40 60, allowing it to flow into plated through-holes.
Long shelf life: Resin flux does not dry out quickly if stored properly (see storage section below).
For high-reliability applications (aerospace, medical), residues can be removed with isopropyl alcohol. But for standard consumer electronics, this Lead Solder for Electronics is “no-clean” compatible.
Engineers often ask: why choose Lead Solder 40 60 over other alloys? Let’s compare:
| Property | Lead Solder Sn40Pb60 | Sn63Pb37 (Eutectic) | SAC305 (Lead-Free) |
|---|---|---|---|
| Melting point | 183–238°C | 183°C (sharp) | 217–220°C |
| Plastic range | Wide (55°C) | None | Narrow (~3°C) |
| Hand soldering ease | Excellent | Good | Poor (higher temp) |
| Wetting speed | Fast | Very fast | Slow |
| Cost per gram | Low | Medium | High |
| Flux core compatibility | Resin, Rosin | Rosin | Special high-activity |
Lead Solder for PCB with Sn40Pb60 is preferred for manual rework because the wide plastic range allows you to “wipe” or “drag” solder across multiple pins – a technique impossible with eutectic or lead-free. For mass production wave soldering, Lead Solder 40 60 also produces fewer bridges.
To get the best results from your Lead Solder Sn40Pb60 40/60 spool, follow these steps:
Ensure the PCB is clean – no oil, grease, or oxidized pads.
For old boards, pre-tin pads with Lead Solder 100g or 200g spool.
For Lead Solder 0.8mm – use 330°C–350°C (626°F–662°F).
Higher temperatures (370°C+) may burn the resin flux, causing black residues.
Touch the Lead Solder for Electronics to the junction of iron tip and component lead.
The resin flux will melt first, then the Lead Solder 40 60 alloy.
Feed only enough to form a concave fillet – about 2–3mm of Lead Solder 0.8mm per joint.
Good joint: Shiny, smooth, with wetting angle <30°.
Cold joint (dull, grainy): Reheat without adding more Lead Solder 200g or other spool – just reflow.
Even the best Lead Solder for PCB can degrade if stored improperly. Follow these guidelines:
Humidity: Keep spools in a dry environment (relative humidity <60%). Resin flux absorbs moisture, leading to spattering.
Temperature: 15°C–30°C. Avoid direct sunlight or hot surfaces.
Original packaging: If you buy Lead Solder 500g for long-term inventory, reseal the spool in a plastic bag with desiccant.
Shelf life: 3+ years when stored correctly. After that, the Lead Solder 40 60 alloy remains perfect, but the flux may become brittle.
We manufacture all spools – Lead Solder 100g, 200g, 250g, 500g – with vacuum-sealed inner bags to guarantee freshness.
Lead Solder Sn40Pb60 contains lead, which is classified as a hazardous substance. However, for professional electronics assembly within RoHS-exempt categories (industrial controls, medical equipment, aerospace, military, and certain telecom infrastructure), Lead Solder for Electronics remains fully legal and often mandatory for reliability.
Safety precautions:
Wash hands after handling.
Use fume extraction or work in a ventilated area – resin flux fumes are respiratory irritants.
Do not eat or drink near soldering station.
Dispose of dross and spool ends according to local hazardous waste regulations.
Neither the Lead Solder 0.8mm nor the flux core contains CFCs, halogens, or chlorides.
Even with high-quality Lead Solder 40 60, you may occasionally encounter problems. Here’s how to solve them:
| Problem | Likely Cause | Solution using same Lead Solder Sn40Pb60 |
|---|---|---|
| Solder balls | Too high iron temp or dirty tip | Reduce to 330°C; clean tip; use fresh Lead Solder 200g |
| Black residue | Burnt flux | Lower temp; increase soldering speed |
| Poor wetting | Oxidized pads or old flux | Add external flux; use new Lead Solder 250g spool |
| Solder not sticking to iron tip | Oxidation on tip | Clean tip with brass wool; re-tin using Lead Solder 0.8mm |
| Excess smoke | Too much feed rate | Reduce feed; the resin flux should sizzle lightly only |
Because our Lead Solder for PCB uses a high-purity resin flux, most issues are eliminated if you follow the temperature guidelines.
Precision diameter: Lead Solder 0.8mm tolerance ±0.05mm ensures consistent feed.
Four weight options: From Lead Solder 100g to 500g, we fit your budget and usage.
High resin content: 2.2% flux core by weight – more than typical 1.8% – for better wetting on oxidized pads.
Clean spooling: No tangles or overlapping layers on any spool, whether you choose Lead Solder 200g or Lead Solder 500g.
Fast shipping: Worldwide delivery from regional warehouses.
| Parameter | Value |
|---|---|
| Alloy | Sn40Pb60 (Tin 40% / Lead 60%) |
| Product name | Lead Solder Sn40Pb60 |
| Diameter | Lead Solder 0.8mm |
| Available weights | Lead Solder 100g, 200g, 250g, 500g |
| Flux type | Resin (Rosin), RMA grade, no halides |
| Flux content | 2.2% ±0.2% by weight |
| Melting solidus | 183°C (361°F) |
| Melting liquidus | 238°C (460°F) |
| Recommended iron temp | 330–350°C |
| Tensile strength | ~45 MPa |
| Elongation | ~30% |
| Resistivity | ~15 µΩ·cm |
| Shelf life | 3 years (sealed), 1 year (opened) |
Select the exact spool size for your production or repair needs:
Lead Solder 100g – SKU: LS-4060-100-08 – Best for trial and field service
Lead Solder 200g – SKU: LS-4060-200-08 – Most popular for small workshops
Lead Solder 250g – SKU: LS-4060-250-08 – Best value per spool
Lead Solder 500g – SKU: LS-4060-500-08 – High-volume production choice
All come with Lead Solder 0.8mm diameter and identical Lead Solder Sn40Pb60 alloy.
Q1: Can I use this Lead Solder for Electronics on RoHS-compliant products?
A: Only if your product is exempt (e.g., industrial, medical, military). For consumer goods requiring RoHS, use lead-free. But for reliability-critical Lead Solder for PCB, this 40/60 alloy is superior.
Q2: Is the resin flux no-clean?
A: Yes, for most applications. However, if you need ultra-high surface insulation resistance (>10¹² Ω), clean with IPA after soldering.
Q3: What iron tip size works best with Lead Solder 0.8mm?
A: Use a 1.5mm–2.4mm chisel or conical tip. Avoid needle tips – they cool down too fast.
Q4: Can I mix Lead Solder 250g from one batch with Lead Solder 500g from another?
A: Absolutely. All spools of Lead Solder Sn40Pb60 are produced under ISO 9001:2025 with traceable lot numbers.
Q5: Does Lead Solder 200g spool fit standard holders?
A: Yes. The spool hub diameter is 50mm (2 inches), compatible with most Weller, Hakko, and generic stands.
Whether you are hand-soldering 10 boards or 10,000, the Lead Solder Sn40Pb60 40/60 in Spools 100g 200g 250g 500g and Diameter 0.8mm for Electronics PCB Assembly delivers professional-grade results. The wide melting range, active resin flux core, and choice of weights make this Lead Solder for Electronics a versatile and economical solution.
Order your Lead Solder 100g, 200g, 250g, or 500g spool today – and experience the consistency of a true 40/60 lead solder with a Lead Solder 0.8mm diameter designed for productivity. For bulk quotes or technical datasheets, contact our sales team.
Contact us:
Email: xfsolder@163.com or xfsolder@gmail.com
WhatsApp/Wechat: +8613450770997
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