PCB Solderability Testing: Define the Surface, Method and Evidence

State whether the request concerns printed-board pads or plated-through holes, component leads or another solderable termination. Record the finish or plating, supplier and lot identity, manufacturing date if known, packaging and storage history. Keep as-received samples traceable to the material under investigation.

Describe the trigger: incoming inspection, extended storage, a finish change or an observed assembly problem. Include photographs and process history where available. PCBSync can review the request with your PCB manufacturing or PCB assembly project and confirm the proposed method, specimen requirements and reporting scope.

J-STD-003 addresses printed-board solderability, while J-STD-002 addresses component leads, terminations and related items. Identify the applicable document and revision with the customer. Different methods produce different evidence, such as visual wetting assessment or a wetting-force response over time.

Do not apply one generic temperature, immersion time, flux or wetting percentage to every finish and specimen. Method details, conditioning and acceptance criteria must come from the approved procedure. A solderability result does not by itself establish that the complete assembly design and soldering process will be successful.

Agree how samples or coupons represent the relevant production lot and finish. Document any conditioning, cleaning or other preparation because it can change the surface being evaluated. Testing may consume or alter samples; confirm disposition and reserve material before releasing the plan.

Use the specimen-allocation tool with an already approved matrix. It multiplies lots, separate conditions and specimens per cell, then adds controls once for the whole plan. It does not select a statistically sufficient sample size, establish an AQL scheme or justify combining different lots.

Request specimen identity, method/revision, preparation and conditioning details, test conditions, actual observations and the acceptance basis. Where a force-time method is used, retain the relevant curve and interpretation. Make exceptions or departures from the agreed method visible in the report.

If a production joint is problematic, review the broader context: surface condition, solder paste or flux, thermal process, geometry and handling. A solderability test can help answer a particular question without proving every possible cause. Send the requested scope and existing evidence to PCBSync for a reviewed quotation and next-step discussion.