T1 dimensional approval decision aid

Warpage in T1 Samples

A buyer review workspace for connecting visible bow or twist to CTQ dimensions, assembly function, measurement method, and repeatability.

Static review summary: map distortion to critical dimensions and assembly function, compare representative measurements, and delay approval until repeatable dimensional evidence is reviewed.

Step 1: What the buyer sees

Record the distortion direction, cavity, time after molding, conditioning state, and repeatability.

Step 2: Why it matters

Focus on whether distortion affects fit, sealing, appearance, or critical dimensions rather than on visual flatness alone.

Step 3: Map CTQ impact

Connect the observed distortion to drawing requirements, fixtures, mating parts, and functional criteria.

Step 4: Patterns to verify

Warpage often reflects a system of interacting patterns; do not treat one visible direction as proof of one cause.

Step 5: Compare measurements

Ask for a consistent measurement method and compare cavities, process conditions, and relevant conditioning states.

Step 6: Request evidence

Require evidence that the proposed correction produces repeatable dimensional and functional results.

Step 7: Approval decision

Delay approval when distortion affects CTQs or assembly and the corrected condition is not demonstrated across representative samples.

Buyer action panel

Turn the scene into a decision

Keep questions and evidence beside the visual, not several screens below it.

Questions to ask the supplier

Which critical dimensions, datums, sealing surfaces, or assembly interfaces are affected?
How and when was the part measured, and was the method consistent?
Does distortion vary by cavity, process condition, material condition, or time after molding?
Which geometry, gating, cooling, packing, and ejection patterns were reviewed?

Documents and evidence to request

Per-cavity dimensional report and agreed fixture method
Labeled samples with measurement timing and conditioning state
Assembly, fit, sealing, or functional test evidence
Cooling, gating, and process-review notes
Repeat-sample comparison after the proposed correction

Add to the next RFQ

Identify warp-sensitive CTQs, datums, assembly, and sealing surfaces
Define measurement method, fixture, timing, and conditioning requirements
Ask suppliers to review geometry, material, gating, and cooling risk
Require per-cavity dimensional and functional evidence at T1

When to delay approval

Warpage affects a critical dimension, datum, seal, fit, or function
Only visual inspection or a selected sample supports acceptance
Measurement method, timing, or conditioning state is unclear
Corrected results are not repeatable across cavities or production-relevant conditions

This buyer-side explainer presents a dimensional review framework, not a confirmed warpage diagnosis. Verify significance and possible contributing patterns against the actual drawing, measurement method, material, geometry, mold, process, samples, and assembly requirements.