Third-Party Inspection

Quality Control Inspection Services in China

Catch defects before they ship — not after you've received them. Our independent QC inspectors verify that your products meet exact specifications at every stage of production, with no ties to the factory and no incentive to pass a failing order.

Three Stages of Quality Control

Quality failures almost always have an early warning sign. Inspecting at the right stage catches problems when they're still fixable — not after your container has shipped.

Pre-Production

Pre-Production Inspection

Conducted before manufacturing begins. We verify that raw materials, components, and approved samples match your specifications before the factory starts cutting or assembling.

  • Raw material and component verification
  • Approved sample comparison
  • Label, packaging, and spec sheet review
  • Production readiness assessment
Inline / During Production

Inline Production Inspection

Conducted when 20–30% of the order is complete. Problems caught here can be corrected in the remaining 70–80% of production — the most cost-effective intervention point.

  • Workmanship and construction checks
  • Measurement and tolerance verification
  • Defect pattern identification
  • Corrective action follow-up
Final / Pre-Shipment

Final Pre-Shipment Inspection

The last checkpoint before your container loads. Conducted when 80–100% of production is complete. You only approve shipment after reviewing our detailed pass/fail report.

  • AQL sampling per agreed inspection level
  • Full function and appearance testing
  • Carton drop, barcode, and labeling checks
  • Quantity and packaging verification

Standard Inspection Checklist

Every inspection covers these categories. We work from your approved spec sheet, samples, and any custom requirements you specify.

01

Quantity verification

Confirm total units produced match order quantity, with correct carton count, inner pack, and master carton labeling.

02

Workmanship

Inspect for surface defects, finishing quality, stitching or welding integrity, and any obvious production flaws.

03

Measurements & tolerances

Verify key dimensions match the approved spec sheet within agreed tolerance ranges using calibrated instruments.

04

Function & performance

Test that the product performs its intended function — buttons, zippers, clasps, moving parts, electronics, and safety features.

05

Color & material matching

Compare against approved samples and Pantone/material specifications for color accuracy and material consistency.

06

Labeling & barcodes

Verify all labels, hang tags, barcodes, country of origin markings, and compliance warnings are correctly applied and scannable.

07

Packaging

Check inner and outer packaging against your packaging spec — correct materials, print quality, insert placement, and carton strength.

08

Drop & stress tests

Carton drop testing verifies packaging survives normal shipping handling. Additional stress tests applied per your product category.

How We Determine Sample Size

We use the ANSI/ASQ Z1.4 sampling standard (commonly called AQL — Acceptable Quality Limit) to determine how many units to inspect from each shipment and how many defects are acceptable before a shipment should be held.

Before production begins, we work with you to define three defect classes: critical (safety or legal violations — zero tolerance), major (functional or visible defects likely to cause returns), and minor (cosmetic issues unlikely to affect salability).

The standard default — AQL 0/2.5/4.0 — means zero critical defects, up to 2.5% major defects, and up to 4.0% minor defects in the inspected sample. We recommend tighter tolerances for regulated products, luxury goods, or high-return-risk categories.

Read our full AQL guide for importers →

Example: 2,000-unit final inspection

Defect class AQL level Accept ≤
Critical defects 0 0 units
Major defects 2.5 7 units
Minor defects 4.0 14 units

Sample size: 125 units from 2,000. Inspection Level II, GIL. If any critical defect is found, or major exceeds 7, the shipment is placed on hold pending your decision.

Common Questions

What is a third-party QC inspection?
A third-party QC inspection is a quality check performed by an independent company with no commercial relationship with either the buyer or the factory. This independence ensures unbiased findings — unlike a self-inspection conducted by the factory, which has an obvious incentive to pass the order.
What is the difference between pre-production, inline, and final inspection?
Pre-production inspection verifies materials and components before manufacturing begins. Inline inspection checks products during production (typically when 20–30% of the order is complete) to catch issues while they're still correctable. Final inspection is conducted when 80–100% of production is finished, before shipment is approved.
How many units are inspected during a final inspection?
Sample size is determined by the AQL standard. For a typical order using AQL 2.5 at General Inspection Level II, a shipment of 2,000 units would require 125 units to be inspected. The right level depends on your order size and risk tolerance — we recommend the appropriate level during briefing.
What happens if my shipment fails inspection?
If a shipment fails, we provide a detailed report documenting every defect found with photographs. You then decide: hold the shipment and require the factory to rework and re-inspect, negotiate a discount, or reject the order. We can conduct a follow-up re-inspection after rework to confirm defects have been corrected.
How quickly can you schedule an inspection?
Standard turnaround is 2–3 business days from booking confirmation. Rush scheduling is available for time-critical shipments. We recommend building inspection time into your production timeline — not treating it as a last-minute step the day before loading.

Need a quality control inspection?

Tell us the factory location, product type, and target ship date. We'll confirm availability and cost within one business day.

Book an Inspection →

From Our Sourcing Guides