CHINA FRP QUALITY CONTROL

FRP quality inspection in China: RFQ-to-shipment checklist

FRP inspection works when requirements are converted into measurable hold points before production. A final visual check cannot recover an incorrect resin, fiber architecture, cure, laminate sequence or certificate scope. Use this checklist from RFQ through pre-shipment release.

Technical sourcing referenceUpdated 2026-08-01

Before PO

Close technical deviations

Before production

Approve materials + plan

During production

Witness critical process

Before shipment

Release against evidence

QUICK COMPARISON

Decision matrix

Stage	Inspect	Evidence	Release question
Supplier qualification	Legal site, process, equipment, quality system	Audit, scope, organization and subcontract map	Can this site make and control the offered product?
Material receipt	Resin, reinforcement, additives, inserts	COA, lot IDs, storage and shelf life	Do inputs match the approved construction?
First article	Dimensions, laminate, surface, fit and function	FAI report, sample, photos and test results	Is the approved baseline reproducible?
In process	Mix/cure, fiber placement, temperature, pressure, tooling	Travelers, logs, witness points	Are critical parameters within limits?
Final inspection	Quantity, dimensions, defects, performance, marking	Inspection report and NCR closure	Does the lot meet every acceptance criterion?
Shipment	Packing, labels, documents and load plan	Packing list, crate photos, release note	Will accepted product arrive traceably and undamaged?

A practical inspection sequence; project risk sets sample sizes and hold points.

Write acceptance criteria before placing the order

The purchase package should identify drawings and revisions, product construction, standards, dimensions/tolerances, appearance limits, performance, test frequency, sampling, documentation, traceability, packaging and deviation control. Terms such as 'good quality' or 'standard tolerance' cannot be inspected consistently.

Use defect photographs or a visual acceptance standard for pits, blisters, dry fiber, exposed reinforcement, cracks, chips, resin-rich areas, print-through, color and finish. Separate cosmetic limits from structural reject conditions.

Control the process characteristics that final inspection cannot see

Critical controls depend on process: resin formulation and gel/cure for molding; pulling speed, die temperature and fiber placement for pultrusion; winding angle and liner for pipe; charge weight, mold temperature and cure for SMC/BMC. Record the parameters that link raw-material lots to finished batches.

If work is subcontracted, identify the site and inspection responsibility. A supplier quality certificate does not automatically cover a different molding, machining or testing location.

Release the shipment from one evidence index

Create a document index with PO/drawing revision, approved deviations, incoming certificates, traveler/lot records, first article, dimensional report, test results, nonconformance closure, packing list and shipment photographs. Each item should identify the production lot.

Verify certificate issuer, site, scope, revision and validity
Match tested specimen, thickness and orientation to the supplied product
Define retest, concession and rejection authority before inspection
Do not release cargo with open critical nonconformances

BUYER FAQ

What should an FRP pre-shipment inspection cover?

It should cover identity/quantity, drawing revision, dimensions, visual defects, required batch tests, marking, traceability, documents and packaging. The exact sample size and tests come from the purchase inspection plan.

Can a final inspection detect the wrong resin or fiber architecture?

Not reliably. Those characteristics require material traceability, process records and sometimes targeted laboratory methods. Control them at incoming-material and production hold points.

Do ISO 9001 certificates prove the FRP product complies?

No. ISO 9001 addresses the quality management system and its certified scope. Product compliance needs product-specific specifications, test evidence and inspection records for the supplied lot.

Primary technical references

References support screening and terminology. Use the applicable paid standard, governing design code and product-specific evidence for final engineering decisions.

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