What Is Pre-Shipment Inspection (PSI)?
Pre-Shipment Inspection (PSI), also known as Final Random Inspection, is an independent quality gate conducted when 100% of your order is produced and at least 80% of the goods are packed. It is the most widely used third-party product inspection service in China — and for good reason: it is the last chance to catch defects before containers are sealed and payments are released.
Certified inspectors randomly select samples from finished goods according to the internationally accepted ANSI/ASQ Z1.4-2003(R2018) statistical sampling standard, then comprehensively review and test your product against agreed specifications. The result: you know exactly what you're shipping before the container doors close.
"We don't just check boxes. Our inspectors have rejected entire lots that factories swore were perfect." — This isn't about being difficult. It's about the judgment that 17+ years of on-the-ground quality control inspection experience in China gives you.
PSI Inspection Process — How It Actually Works on the Ground
You can refer to this general flowchart to see how third-party inspection companies typically operate. It's also what our inspectors actually execute inside Chinese factories every single day:
Order Intake & Standard Confirmation
The inspector completes this before leaving the office — confirming product specification sheets, client-specific requirements, packaging methods, AQL sampling level, and acceptance criteria. Without these, they don't step into the factory.
On-Site Arrival & Production Verification
First thing on arrival: verify production is 100% complete, at least 80% of the goods are packed, and the products match the order. If production is short or too few goods are packed, we don't pull samples — the clock doesn't start until the job is doable.
Random Sampling — AQL Standard Execution
Randomly select the specified number of samples from finished cartons according to ANSI/ASQ Z1.4. The inspector controls the entire sampling process — no factory-prepped "special samples" allowed. Use our online AQL sampling calculator to determine your required sample size before the inspection service even starts.
Item-by-Item Quality Inspection & On-Site Testing
Each sample is individually checked for appearance, workmanship, function, dimensions, assembly, safety, and more. Defects are photographed and documented immediately. On-site disassembly or function testing is performed when necessary.
Defect Classification & Pass/Fail Decision
Classify every defect as Critical, Major, or Minor per international standards. Cross-reference against the AQL acceptance table to determine pass or fail. This isn't a gut-feel call — it's an objective, statistically-driven decision.
Detailed Third-party Inspection Report Delivery
24 hours English inspection report (same-day for expedited services): sampling data, every defect found, on-site digital photos, defect classification statistics, and final PASS / FAIL / PENDING conclusion with professional recommendations. You now have "eyes on the ground" in China.
What You Receive — Inside a Real Third-party PSI Report
Everything above is the process. This is the deliverable: a full English inspection report delivered within 24 hours of the inspector leaving the factory (CNQ same day for expedited services available at 30USD). Every judgment in it is backed by photographic evidence, not adjectives. A third-party PSI report contains:
- Conclusion page — the PASS / FAIL / PENDING verdict with sampling data and defect statistics summarized on page one, so a shipping decision takes seconds, not a meeting.
- Sampling record — which cartons were pulled and from where in the stack, documenting that sampling was random and inspector-controlled, never factory-guided.
- Defect documentation — every defect photographed, classified Critical / Major / Minor, and tallied against your AQL acceptance numbers.
- Measurement & test data — recorded dimensions, weights, and on-site function and safety test results, compared against your specification sheet.
We have uploaded few sample reports — download sample inspection reports (apparel, toy, electronics and jewelry examples) and see exactly what lands in your inbox before you book.
What To Check During a Pre-Shipment Inspection
A complete PSI report covers all of the following. This is not a pick-and-choose checklist — it's a systematic, comprehensive verification:
- Quantity verification — total produced vs. available for shipment
- Style, color & product description — match against order specs
- Appearance & workmanship — cosmetic defects, finishing quality
- Function & performance testing — does it actually work as intended
- Dimension & weight measurement — tolerance against spec sheets
- Assembly & construction — pre-assembly check for fitting issues
- Packaging & packing method — inner/outer carton, protection adequacy
- Labels, markings & barcodes — correct, scannable, compliant
- Safety & reliability — sharp edges, small parts, stability risks
- Client-specific requirements — any additional specs you've defined
The checklist adapts by product category: electronics add hi-pot electrical safety and full function testing, garments add measurement, color checks and needle detection, furniture adds assembly and load testing, and toys add small-parts and safety checks. Select your industry pages for electronics & electrical products, apparel & textiles, furniture, toys, building materials and garden & outdoor products.
Which Quality-Control Service Should You Choose?
PSI is one instrument in a full quality-control toolkit. Use this matrix to match the service to the stage of your order — and remember the services are not mutually exclusive. For high-risk projects, buyers layer them: for example IPC + PSI + lab testing on the same order.
| Service | When It Runs | What It Answers | Typical Cost |
|---|---|---|---|
| Pre-Shipment Inspection (PSI) | 100% produced, ≥80% packed, before shipment | Does this finished batch meet spec under AQL statistical sampling? Ship or hold? | $198/man-day |
| Initial Production Check (IPC) | Before mass production begins | Are raw materials, components and first-piece quality correct before the full run starts? | $198/man-day |
| During-Production Inspection (DPI) | Mid-production, 20–50% of output complete | Are early-run units compliant? Catch systematic defects before the mass run amplifies them. | $198/man-day |
| Container Loading Supervision (CLS) | At loading, after goods pass inspection | Is the right quantity loaded, stowed and sealed correctly? (Verifies loading — not product quality.) | $198/man-day, 1 per container |
| Factory Audit | Supplier qualification, before order placement | Is this factory capable, organized and compliant for your order? | Swift $199 / Comprehensive $358 per factory |
| Full Inspection (100% Sorting) | Post-production; zero-tolerance goods or after a failed PSI | Is every single unit conforming, with defects removed before packing? | $198/man-day, usually multiple man-days |
| Laboratory Testing | Any stage, on samples | Do materials comply with destination-market regulations (CE, RoHS, REACH, EN 71)? | Quoted per test item, CNAS-accredited partner labs |
What a PSI Does Not Cover
A PSI verifies the sampled units against your specification — it is not a certification program. Laboratory compliance testing, 100% full inspection and sorting, container loading supervision and a factory quality-system audit are separate services that answer different questions — see the matrix above. For a complete quality position, buyers typically combine PSI with CLS, add a factory audit at the supplier-qualification stage, and laboratory testing where the destination market requires it.
What Quality Standards Are Used?
Generally, a third-party inspection company uses AQL (Acceptable Quality Level) tables for statistical sampling — the most widely adopted sampling acceptance standard in global trade. You don't check every single item, but through a scientifically-designed sampling plan, you can make an accept-or-reject decision on the entire lot with statistically controlled risk.
New to AQL? Read our plain-English introduction: ANSI/ASQ Z1.4 Sampling Guide for Importers. Then, use the online AQL sampling calculator to find your exact sample size in seconds — and estimate your required man-days and product inspection costs in a single click.
How To Classify Defects
Every defect found is classified into one of three severity levels according to international standards. This is not subjective — each product category has a corresponding defect classification reference:
| Defect Level | Definition | Impact |
|---|---|---|
| Critical | Fails to meet mandatory regulations and/or affects consumer safety when using the product. | Potential recall, legal liability, or personal injury |
| Major | Likely to result in product failure, reduce product usability, or cause obvious appearance defects affecting salability. | Customer rejection, returns, brand damage |
| Minor | Not likely to reduce product usability, but may reduce salability or deviate from defined quality standards. | Possible customer feedback but unlikely to cause returns |
Based on the number of defects found per category versus the allowed figures in the AQL tables, we provide a professional recommendation to accept or reject the shipment. The final decision is yours — but we give you data-backed, on-the-ground intelligence to make it.
Why Do Tests Use Much Smaller Sample Than General Level II?
A question we hear regularly from buyers reviewing the report: "Under General Level II you drew 315 units for the visual check — so why did the drop test cover only 8?" It is a fair question, and the answer is not reduced effort. It follows the ANSI/ASQ Z1.4 / ISO 2859-1 logic for functional tests that are destructive or time-consuming. Two practical reasons:
1. Test duration. A visual check on one unit takes seconds. A drop test, a cross-cut adhesion test or a plush-toy inner-stuffing check takes minutes to prepare, execute and document. Running those tests across the full 315-unit sample would consume the entire on-site factory inspection window — and add days to the visit.
2. Damage risk. Some tests damage or consume the sample: a drop test may break the unit on impact or leave it unfit for shipment; a cross-cut (tape-pull) adhesion test cuts through the surface coating; a plush-toy inner-stuffing check requires cutting the toy open, so the tested unit cannot ship.
Here is the rule in practice: only three things run on the full General-Level-II sample — visual defects, cosmetic appearance, and swift simple functional checks where applicable (an on/off switch, a zipper pull, a clasp that takes a second to click). All other onsite tests — drop tests, cross-cut adhesion, dimensional measurement, assembly checks — run under Special Inspection Levels S-1 to S-4, the small-sample schemes defined in the same standard, with S-2 as our default. Our AQL calculator implements these special-level tables, so you can see the exact sample size your lot would use.
Practical note: special-level onsite testing is normally run with a zero-failure acceptance rule (Ac = 0, Re = 1). On a sample this small, a single failure is not treated as random variation — it is read as a signal of systemic process risk, and we investigate it as such before recommending anything.
A Real Case: Pre-Shipment Inspection Catches Fatal Assembly Defects in Furniture
A European furniture brand with an order of 2,800 units of flat-pack furniture in Qingdao, Shangdong, China, including TV stands, bookshelves, and storage cabinets. The factory claimed "all passed self-inspection, ready to ship." Our inspector arrived on site and randomly pulled 125 samples (per AQL Level II standard) for quality inspection.
What We Found
- Screw hole misalignment — In over 40% of samples, pre-drilled screw holes didn't align with hardware at all. Our inspector spent 15 minutes trying to assemble one sample unit and discovered the door panel simply couldn't be installed.
- Door panel holes drilled on wrong side — Several cabinet door panels had locker holes drilled on the left side instead of right (or vice versa), making doors impossible to install as designed.
- Inconsistent hardware quality — Some batches of screws had incomplete threads or shallow Phillips heads that stripped instantly under an electric screwdriver.
Conclusion & Impact
Test results: 0 Critical, 42 Major, 18 Minor defects. The Major defect count far exceeded the AQL acceptance limit (under Level II, 2.5 Major AQL, the acceptance number is 7). The inspection verdict: FAIL.
What would have happened if the client had paid and shipped directly? 2,800 units arriving at a European warehouse — only for the end customer to discover they can't assemble the furniture. Returns, compensation, brand reputation damage. One pre-shipment inspection costing less than 0.3% of the order value saved this client from a potential six-figure Euro loss.
A factory audit in China would likely have uncovered the root cause — this factory's CNC drilling process and jig management had drifted out of tolerance. If identified at the supplier selection stage, the entire batch defect could have been prevented at the source.
Defect Gallery — Real Defects Found On-Site
These images are from the actual furniture inspection described above. Each one illustrates a defect that — if not caught — would have surfaced in the hands of a paying customer.
Inspecting Product Before Packing — A Cautious PSI from the Field
Some product categories are inspected before packing rather than after, like special pallet packing products, KD (knock-down) furniture, large-format items, and goods with one-time or expensive packaging where opening a sealed carton would damage it or make repacking impractical. This is an agreed variation of the standard timing — confirmed with the buyer at booking stage and written into the quality control inspection protocol.
What 17 years of on-site quality inspection on factory floors has taught us, though, is that this is the arrangement our senior inspectors treat most carefully. Not because the inspection itself is harder — it isn't. Because the inspection finishes before the riskiest step of the entire process has even started.
The inspector samples the product and verifies on the production floor. And the packing starts after inspection.
A factory packing team is a different team from the production team. They are paid by the carton, not by the inspection standard. Packing speed is tied directly to the delivery deadline. And the categories that come with expensive, one-time packaging — large, high-gloss, metal, irregularly shaped — are also the ones most exposed to handling damage. A surface that was perfect on the inspection bench can pick up a scuff, a scratch or an edge impact on the way into the carton. Nobody photographs it. Nobody records it. The inspection report says: pass.
Then the container arrives at the destination warehouse. The cartons are opened, and the damage is on the first units the customer sees. That's when we get the call. The buyer asks: "Why didn't the inspection catch this?"
It is a fair question — and the honest answer is that the defect did not exist at the time of inspection. The product was correct when it was sampled. What changed was the handling that came afterwards.
This is not a gap in the inspection. It is a characteristic of the inspection timing itself. And it is a risk that can be closed. Two options are available — and if neither is arranged, the report states the limitation plainly.
- Packing Process Supervision — an inspector on the packing line, watching the product being handled, cushioned and boxed. Damage during packing is caught at the moment it happens. This is the only method that sees what happens inside the packaging process.
- Limited post-packing opening — where the buyer accepts the repacking cost, a small number of cartons are opened after packing, the product surface is checked, and the carton is re-sealed.
- Written limitation — if neither is arranged, the inspection report states plainly that packing was not independently witnessed and post-packing appearance was not verified.
One practical effect is worth mentioning: the presence of an independent inspector on the packing line — or even the awareness that a post-packing check may follow — tends to raise the level of care. Not surveillance; just a quiet reminder that the product is being watched. If your product falls into this category, flag it at booking — we will recommend the right coverage and note it in the protocol.
What to Do When Your PSI Fails: A Practical Roadmap
A FAIL verdict isn't the end — it's your chance to correct course before the goods leave China. Below is the standard action roadmap we've developed from 17 years of on-the-ground experience. Each step is designed to put you back in control and ensure the factory bears its share of responsibility.
Pause Balance Payment
With CNQ's official FAIL report in hand, immediately pause your balance payment. This independent report is your strongest leverage in negotiations — without it, the factory will say "it's not that bad." With it, the conversation shifts from opinion to documented evidence.
Review Defect Severity & Feasibility
Work with the CNQ technical team and the factory to assess the nature of the defects: which ones can be reworked on-site, which justify a price reduction, and which require remaking. Don't make blind decisions — critical defects and minor imperfections demand very different responses.
Require Factory CAPA & 100% Sorting
Require the factory to submit a Corrective and Preventive Action Plan (CAPA) within 48 hours, explaining the root cause and corrective measures. At the same time, require them to arrange 100% sorting and rework of the entire batch — not sampling, every single unit. Where the sorting and rework-verification work needs independent supervision, this is run as a standalone 100% full inspection and sorting assignment, with every unit examined, defective units segregated in a red zone, and approved cartons sealed with tamper-evident stickers.
Schedule Targeted Re-Inspection
Once the factory completes rework and passes their own internal check, schedule a targeted re-inspection. We'll focus specifically on whether the defects that caused the initial FAIL have been fully corrected. Per international trade practice, the re-inspection fee is paid by you upfront but can be deducted from the factory's balance payment.
Remember: a FAIL report isn't bad news — it's the last correction opportunity you get before releasing payment. Use it well, and you save more than money. You save brand reputation and customer trust.
Transparent Pricing — What Does PSI Cost?
Our pre-shipment inspection service uses a per-man-day pricing model. What you're buying isn't just a man-day of someone's time — it's a senior inspector + professional report + on-site photos + a complete set of evidence so you can release payment with confidence.
Most small-to-medium orders (under 35,000 units) require only 1–2 man-days to complete the quality control inspection. Compare that to the cost of shipping a defective batch — freight, duties, warehousing, return handling, and brand reputation damage — and this cost becomes negligible.
How many man-days your order actually needs is driven mainly by product category — standardized hardgoods allow roughly 315 inspected units per man-day, garments around 200, furniture around 125. See the full man-day benchmarks by product category or use the free inspection cost calculator for an instant estimate.
Your supplier or factory may not give you an honest picture of your goods' quality. Our PSI service changes that:
Operating in China since 2009. We've seen almost every factory "trick" — from pre-prepped samples to last-minute swaps. Our inspectors don't fall for them. Full English inspection report delivered the same day the inspection finishes — including defect photos, test data, and PASS / FAIL conclusion. No waiting two days to make a shipping decision. This is the industry's dirty secret, but we have zero tolerance. Any inspector confirmed to have accepted factory incentives is immediately terminated. Our results are not influenced by the factory — that's the whole point of hiring a third-party inspection. From furniture to electronics, textiles to hardware — our inspection team covers all major manufacturing categories in China. Not sure if we handle your product? Ask us first.
Quality is the part of sourcing from China you can't afford to skip. Whether you're a small importer or a large retail brand, one pre-shipment inspection can save you multiples of what it costs. Our product inspection services in China cover pre-shipment, full inspection, and container loading checks. We also recommend completing a factory audit early in the supplier relationship — many quality issues found during factory inspection could have been screened out at the audit stage.
Ready to arrange an inspection for your next order? Get your CNQ experts — tell them what you need, and we will respond with a plan within 12 hours. Not ready to reach out yet? Try our online AQL sampling calculator — find out how many units you should be testing for your order size. Or download a sample inspection report to see exactly what a CNQ report contains before you book.Why Choose CNQ for Pre-Shipment Inspection?
17+ Years on the Ground
24-hour English Report
Zero Tolerance for Bribery
Broad Industry Coverage
Let CNQ Catch Defects Before Your Shipment Leaves Factory