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In the demanding world of electronics manufacturing, the quality of your solder joint directly determines the reliability and lifespan of every circuit board. Whether you are running a high-volume PCB assembly line or sourcing materials for national distribution, choosing the right solder alloy is a strategic decision. Introducing our premium Flux Core Lead Solder Sn63Pb37 — a eutectic solder designed for speed, strength, and consistency. Available in a comprehensive range of weights (Lead Solder 1/4lb, Lead Solder 1/2lb, Lead Solder 1lb, Lead Solder 2lbs) and diameters (Lead Solder 0.9mm, Lead Solder 1.6mm), this product meets the exacting standards of circuit board welding and industrial procurement.
The alloy Sn63Pb37 (commonly referred to as Lead Solder 63 37) is globally recognized as the eutectic gold standard for electronics assembly. Unlike non-eutectic alloys that pass through a pasty range, Lead Solder Sn63Pb37 melts and solidifies at a single, precise temperature of 183°C (361.4°F). This unique property eliminates the risk of cold solder joints, movement during cooling, and wicking defects that plague other alloys.
Eutectic Behavior: Instantaneous phase change from liquid to solid ensures perfect joint formation.
Low Melting Point: Protects heat-sensitive components on modern circuit boards.
Superior Wetting: Exceptional flow characteristics into plated through-holes and surface mount pads.
Tensile Strength: Provides mechanical robustness for high-vibration environments (automotive, industrial controls).
When you source Lead Solder for Circuit Boards, the Sn63Pb37 composition offers the lowest porosity and highest conductivity compared to lead-free alternatives, making it irreplaceable for aerospace, medical devices, and military-grade electronics.
A solder wire is only as good as its flux core. Our Flux Core Lead Solder features a halogen-activated rosin flux (ROL0 classification per IPC J-STD-004). The flux is evenly distributed within the alloy matrix, ensuring consistent activation across every inch of the wire.
Instant Oxide Removal: The flux core cleans copper traces, component leads, and HASL/ENIG pads immediately upon melting.
Reduced Spattering: Precision formulation minimizes solder balls and micro-splatter, lowering post-solder cleaning costs.
Clear, Non-Corrosive Residue: Leaves a transparent, non-conductive residue that can be left in place for non-critical applications or easily removed with standard solvents.
Extended Shelf Life: Sealed flux core remains active for 24+ months under proper storage.
For circuit board welding, the flux core eliminates the need for external liquid flux dispensers, reducing production steps and operator error. This is why factories and importers globally standardize on Flux Core Lead Solder for both manual touch-up and automated selective soldering processes.
Understanding that different operations have different consumption patterns, we offer Lead Solder in Rolls across five precise weight options. Each roll is hermetically sealed in anti-static, moisture-barrier packaging to preserve flux activity.
The Lead Solder 1/4lb roll (approx. 114 grams) is ideal for:
Prototyping labs where alloy grades change frequently.
Rework technicians performing BGA/CSP micro-soldering.
Field service kits for on-site circuit board repairs.
Sample evaluation before bulk procurement.
Lead Solder 1/2lb (approx. 227 grams) hits the sweet spot between portability and run-time. This size is favored by:
Low-to-medium volume contract manufacturers.
University engineering workshops.
Hobbyist-to-prosumer electronics brands.
Importers offering retail-ready consumer packs.
The Lead Solder 1lb roll (454 grams) is the most common industrial size. It fits standard soldering stations from Hakko, JBC, Weller, and Metcal. Applications include:
Manual assembly lines for IoT devices.
Potting and tinning of transformers/inductors.
General circuit board welding of through-hole components.
For factories consuming over 10kg per shift, the Lead Solder 2lbs roll (908 grams) reduces downtime spent changing spools. Benefits:
Fewer mid-shift roll changes → higher OEE.
Lower per-gram cost → improved COGS.
Ideal for automated soldering robots and selective soldering machines.
Lead Solder 0.9mm diameter is engineered for:
0603, 0402, and 0201 passive components.
QFP (Quad Flat Package) leads with 0.5mm pitch.
QFN (Quad Flat No-lead) drag soldering.
Dense memory modules and smartphone motherboards.
Lead Solder 1.6mm delivers high deposition rates for:
Large connectors (USB, HDMI, power jacks).
Transformer and relay terminals.
Ground pads and thermal reliefs on 2oz+ copper layers.
Automotive battery management system boards.
Factories appreciate having both Lead Solder 0.9mm and Lead Solder 1.6mm in stock to match each process step.
A circuit board welding process is only as strong as its weakest joint. Our Lead Solder for Circuit Boards passes rigorous internal testing and third-party verification.
RoHS Exemption 7b: Lead in solder for electronic assemblies remains exempt (Directive 2011/65/EU).
IPC J-STD-006: Alloy composition tolerance: Sn62.5-63.5% / Pb balance.
ISO 9001:2015 manufacturing facility.
REACH SVHC free above threshold limits.
When used in selective soldering nozzles or wave soldering machines, Flux Core Lead Solder delivers:
Dross reduction: 30% less dross than generic brands.
Faster wetting time: 0.8 seconds on Cu-OSP surface.
Spreading factor: >85% per IPC-TM-650.
These metrics translate to fewer touch-ups, lower defect rates (target <50 DPMO), and reduced flux consumption.
Importers and distributors looking to expand their passive component or soldering supplies portfolio will find our Lead Solder 63 37 line exceptionally attractive.
Standardized packaging: Printed cartons with clear specification labels in English, Chinese, and German.
Barcode-ready: EAN-13 and UPC-A codes for immediate retail placement.
Pallet configurations: 40 rolls per master carton (for Lead Solder 1lb), 120 rolls per carton (for Lead Solder 1/4lb).
Mixed-weight master packs: Order a mix of Lead Solder 0.9mm and Lead Solder 1.6mm on the same pallet.
Our Lead Solder for Circuit Boards is already distributed in:
North America: Contract manufacturers, defense subcontractors.
Europe: Automotive electronics (Germany, France, Italy).
Southeast Asia: EMS providers for consumer electronics.
South America: Repair networks and small-batch assembly.
As an importer, you benefit from:
Exclusive territory agreements (subject to volume).
Private labeling minimum 100 rolls.
Drop-shipping from regional warehouses (US, NL, SG).
| Parameter | Specification |
|---|---|
| Alloy Composition | Sn63% / Pb37% (±0.5% each) |
| Melting Point | 183°C (361°F) – Eutectic |
| Flux Type | Rosin, Halogen-activated (ROL0) |
| Flux Content | 2.2% ±0.2% by weight |
| Insulation Resistance | >1×10¹² Ω after 96h/85°C/85% RH |
| Copper Mirror Corrosion | Pass (No attack) |
| Surface Insulation Resistance | Pass per IPC J-STD-004 |
| Shelf Life | 24 months (original sealed package) |
| Storage Temperature | 10°C to 40°C, <70% RH |
| Weight | Diameter 0.9mm | Diameter 1.6mm | Spool Type |
|---|---|---|---|
| 1/4 lb | ✅ | ✅ | Clear plastic |
| 1/2 lb | ✅ | ✅ | Anti-static |
| 1 lb | ✅ | ✅ | Industrial |
| 2 lbs | ✅ | ✅ | Jumbo spool |
For Lead Solder 1/4lb and Lead Solder 1/2lb, each roll is individually blister-packed with a desiccant. For Lead Solder 1lb and Lead Solder 2lbs, rolls are vacuum-sealed with a silica gel pack.
Switching to our Flux Core Lead Solder requires no special equipment changes. However, optimal results are achieved with the following profiles:
Tip temperature: 320°C to 350°C (608°F to 662°F).
Dwell time: 1 to 3 seconds per joint.
Feed rate: 10-15 mm of Lead Solder 0.9mm per second.
Nozzle temperature: 350°C ±10°C.
Nitrogen purge: Recommended for non-clean applications.
Wave height: 3-5 mm measured from nozzle tip.
Every batch of Lead Solder 63 37 is accompanied by a Certificate of Analysis (COA) that includes:
XRF spectroscopy alloy verification.
Flux activity index (≥95%).
Halide content (chloride/bromide <0.1%).
Visual inspection for surface cracks or inclusions.
We maintain retained samples for every production lot for a minimum of five years. This is critical for importers supplying automotive or medical OEMs that require 10+ year traceability.
For a factory consuming 50 lbs of solder per month:
| Parameter | Generic Solder | Our Flux Core Lead Solder | Saving |
|---|---|---|---|
| Price per lb | $18.00 | $10 | 10% |
| Dross generation | 8% | 5% | 37.5% |
| Touch-up rate | 3.2% | 1.1% | 65% |
| Flux residue cleaning IPA | 500 ml/day | 150 ml/day | 70% |
Ordering Lead Solder 2lbs rolls vs Lead Solder 1lb spools further reduces changeover labor by 50%. Importers who stock Lead Solder 1/2lb for retail achieve 35-40% gross margins at typical resale prices.
Yes. The RoHS directive grants an exemption (2011/65/EU Annex III, entry 7b) for lead in solders for electronic assemblies where lead-free alternatives are not technically reliable – primarily high-reliability, automotive, and medical equipment.
Absolutely. However, Lead Solder 1.6mm feeds faster and reduces operator fatigue for large ground pins or connectors. Many factories keep both diameters on each assembly station.
Store in a cool, dry cabinet (10-30°C). Avoid temperature cycling. For Lead Solder 1/4lb and Lead Solder 1/2lb opened rolls, reseal in a zip-lock bag with desiccant. Flux cores absorb moisture, which can cause spattering.
24 months from date of manufacture and if store properly it would be longer shelf life
Yes. A Safety Data Sheet (SDS) meeting GHS requirements (US, EU, China) and a Technical Data Sheet (TDS) are available for download or printed with bulk orders.
Sample order: 1 roll each of Lead Solder 0.9mm and Lead Solder 1.6mm (any weight).
Factory direct: 50 lbs mixable across Lead Solder 1/4lb, Lead Solder 1/2lb, Lead Solder 1lb, Lead Solder 2lbs.
Importer stock order: 100 lbs per alloy/diameter with private label options.
Production Time: Around 2 weeks.
Shipping Time: Depending on countries destination, it takes from 10 days to 45 days with shipping by sea.
Contact our technical sales team with your:
Target monthly consumption (lbs or kg).
Preferred Lead Solder 0.9mm vs Lead Solder 1.6mm ratio.
Required certifications (IPC, MIL, industrial).
Destination port/city.
We provide free 1lb sample rolls for qualified factory trials and importers with a valid business license.
From reworking a single prototype to populating million-unit production runs, the choice of Flux Core Lead Solder determines throughput, yield, and long-term reliability. Our Lead Solder Sn63Pb37 delivers the eutectic advantage, clean flux activation, and flexible packaging — Lead Solder 1/4lb for R&D, Lead Solder 1/2lb for service technicians, Lead Solder 1lb and Lead Solder 2lbs for mass production, and both Lead Solder 0.9mm and Lead Solder 1.6mm diameters to cover every joint geometry.
For factories and importers seeking a consistent, cost-effective Lead Solder for Circuit Boards, this product line eliminates variability. Upgrade your circuit board welding process today. Request your spec sheet or sample roll — and experience why industry leaders trust Lead Solder 63 37 for mission-critical electronics.
Call to Action:
WhatsApp/Wechat:+8613450770997
Email: xfsolder@gmail.com or xfsolder@163.com
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