Meta Description: Pre-shipment inspection (PSI) catches 60-80% of quality issues before your goods leave China. How to arrange, set AQL levels, select samples, and read the report.
> Key Takeaway
> A pre-shipment inspection (PSI) catches 60-80% of quality issues before goods leave the factory — at $149-$350 per visit, it is the highest-ROI QC check an Alibaba buyer can arrange. This guide covers how to book one, what AQL levels to set, how samples are selected, and how to read the report.
Quick Facts: Pre-Shipment Inspection
| Metric | Value |
|---|---|
| Timing | 80%+ packed |
| Cost range | $149-$350/day (all-inclusive) |
| Defect categories | Critical (0%), Major (2.5%), Minor (4.0%) |
| Default sampling | ISO 2859-1 Level II Normal |
| Dispatch time | 24-48 hours |
| Report delivery | Same day to 24 hours |
| Quality issues caught | 60-80% of all defects |
Why PSI Catches 60-80% of Quality Issues
A PSI inspection at 80%+ completion is the final checkpoint before goods leave China. Unlike IPC (before production) or DUPRO (mid-run), PSI examines the finished, packed product as it will arrive. This is where most defects — material inconsistencies, packaging damage, labeling errors — become visible.
The defect correction cost curve explains why PSI matters:
| Stage | Fix Cost | Leverage |
|---|---|---|
| IPC (before production) | $1 | Maximum |
| DUPRO (mid-production) | $10 | High |
| PSI (80%+ complete) | $100 | Still high — final payment pending |
| After arrival | $1,000+ | Zero |
By shipment time, 60-80% of all defects have accumulated. PSI catches them while you still have leverage — the factory wants to avoid a cancelled payment after production is complete.
How to Arrange a PSI for Your Alibaba Order
Step 1: Choose a provider. E-commerce-focused services (TradeAider at $199/day, QIMA at $299/day, or V-Trust at $249/day) offer all-inclusive pricing with 24-48 hour dispatch. Global leaders (SGS, BV, Intertek) cost $300-800+/day and take 3-5 days to schedule.
Step 2: Provide documentation. Send the inspection company your PO number, the factory address, your golden sample (or detailed photos), and your spec sheet with material grades and tolerances.
Step 3: Set AQL levels. Standard is ISO 2859-1:2026 Level II Normal with Critical 0%, Major 2.5%, Minor 4.0%. Use Level III for safety-critical products or new suppliers.
Step 4: Confirm timing. Schedule when the supplier confirms 80%+ of the order is packed. Most dispatch within 24-48 hours and deliver the report within 24 hours.
AQL Sample Selection in Practice
The inspector determines sample size using ISO 2859-1 code letters based on batch size and inspection level:
| Batch Size | Code | Samples | Major 2.5% (Ac/Re) | Minor 4.0% (Ac/Re) |
|---|---|---|---|---|
| 501-1,200 | J | 80 | 3 / 4 | 7 / 8 |
| 1,201-3,200 | K | 125 | 5 / 6 | 10 / 11 |
| 3,201-10,000 | L | 200 | 7 / 8 | 14 / 15 |
| 10,001-35,000 | M | 315 | 10 / 11 | 21 / 22 |
The inspector pulls samples randomly from multiple cartons across the shipment — not from the top layer or a single location. For code L (200 samples) on a 3,500-unit batch, the inspector selects from at least 8-12 cartons spread across the pallet layout.
How to Read a PSI Report
A PSI report has three critical sections:
1. Accept/Reject verdict. The report states pass or fail for each AQL category. For a code L batch at Major 2.5%, if defects total 5 (Ac=7), the batch passes. If they total 9 (Re=8), it fails.
2. Defect photos and descriptions. Each defect is photographed with measurements. Use these as evidence for rework requests.
3. Non-quality checks. Confirms carton count, unit quantity per carton, labeling, barcode readability, and packaging condition.
What to do with a fail: Request a 100% sort or rework referencing the inspector's photos. Schedule a second PSI. Because goods are still at the factory, you have maximum leverage.
Frequently Asked Questions
Q: What percentage of quality issues does pre-shipment inspection catch?
A: Industry data shows PSI catches 60-80% of all quality issues before goods leave the factory — more than any other single QC check.
Q: How do I arrange a pre-shipment inspection for an Alibaba order?
A: Choose a provider (TradeAider $199/day, QIMA $299/day, or V-Trust $249/day), provide the factory address and PO number, specify AQL levels, and schedule at 80%+ production. Most dispatch in 24-48 hours. The CNBusinessHub team can help you select and coordinate the right inspection provider for your order.
Q: What AQL level should I use for my PSI?
A: Standard is ISO 2859-1 Level II Normal, Critical 0%, Major 2.5%, Minor 4.0%. Use Level III for safety-critical products or new suppliers.
Q: How does the inspector select samples during a PSI?
A: Random samples from multiple cartons using ISO 2859-1 code letters. A 3,500-unit batch yields code L — 200 samples from 8-12 cartons.
Q: How do I read a PSI inspection report?
A: Look for the Ac (Accept — max defects allowed) and Re (Reject — batch fails at this count) numbers for each defect category. If Major defects ≤ Ac, the batch passes. If ≥ Re, it fails. The report also shows photos of defects, quantity check results, and packaging condition. Not sure how to interpret your PSI report? CNBusinessHub offers report analysis as part of our QC support services.
Q: What is the difference between PSI and DUPRO?
A: DUPRO checks quality at 20-50% production so issues can be corrected mid-run. PSI is the final check before shipment. Use both for orders over $10,000.
Q: Can I replace PSI with a factory audit?
A: No — an audit evaluates supplier capability; a PSI checks the actual product batch. You need both.
Q: What happens if my PSI fails?
A: Request a 100% sort or rework using the inspector's photos. Schedule a second PSI. Goods are still at the factory, giving you maximum leverage. CNBusinessHub can help you manage the rework process and coordinate reinspection with your provider.
Q: Do I need to send a golden sample to the inspector?
A: Yes — provide the sealed golden sample and spec sheet to the inspection company before the visit. The inspector checks the production batch against your golden sample, not against the supplier's internal standard. This is the only way to verify material grade and finish consistency.
Q: What does the PSI inspector check beyond product quality?
A: Carton count, unit quantity, labeling, barcode readability, packaging condition, and seals — catching short-shipping and compliance issues.
Q: How much does PSI cost and is it worth it?
A: $149-$350 per person-day. For a $5,000-$10,000 order, the $200-350 fee protects against potential losses of $5,000-$78,000 — the average supplier scam loss reported in import communities. Contact the CNBusinessHub team for guidance on choosing a cost-effective inspection provider for your budget.
Conclusion
A pre-shipment inspection is the single most critical quality check in the Alibaba buying process — catching 60-80% of defects while goods are still at the factory and you still have leverage. At $149-350 per visit, the ROI is unmatched. The three keys: specify AQL levels in writing, provide a golden sample, and learn to read the Ac/Re verdict in the report.
The CNBusinessHub team helps international buyers build complete quality control programs for China sourcing.
Our quality control services include:
- Pre-shipment inspection (PSI) coordination and AQL planning
- Supplier verification and factory audit management
- Golden sample management and spec sheet review
- Inspector report analysis and rework coordination
- Complete QC program development for China sourcing
📧 Email: info@cnbusinesshub.com
🌐 Website: https://cnbusinesshub.com
Contact us to design a QC plan that protects every order.
Disclaimer
This article is written by the CnBusinessHub team for informational and educational purposes only.
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