AQL Inspection Explained — Quality Standards for Clothing Buyers

What AQL Means

AQL is a statistical standard that determines sample size and acceptance criteria. Instead of inspecting every garment, you inspect a representative sample. This saves time while providing reliable quality assessment.

AQL is based on ISO 2859-1, an international standard for sampling. It provides statistically valid results when followed correctly. Most garment manufacturers use AQL for quality inspection.

SDF Clothing uses AQL standards for all quality inspections. We follow ISO 2859-1 guidelines to ensure consistent quality assessment.

AQL 1.0 vs 2.5 vs 4.0

AQL 1.0 is the strictest level. It is used for critical quality requirements. Fewer defects are acceptable. Sample sizes are larger. This level is common for high-end luxury brands.

AQL 2.5 is standard for most garment production. It balances quality with practicality. This is the most common AQL level for clothing. SDF Clothing uses AQL 2.5 as standard.

AQL 4.0 is more lenient. More defects are acceptable. This level is used for less critical garments or bulk production where minor defects are acceptable.

Critical, Major, Minor Defects

Critical defects are never acceptable. These include safety issues, hazardous materials, and legal non-compliance. Any critical defect means automatic rejection.

Major defects make the garment unusable. Examples include holes, stains, incorrect color, wrong size, broken zippers, and missing buttons. These defects significantly affect function or appearance.

Minor defects do not affect function but affect appearance. Examples include loose threads, slightly uneven seams, and minor color variation. These defects are acceptable within AQL limits.

Sample Size Determination

Sample size depends on batch size. Larger batches require larger samples. However, sample size does not increase proportionally. A 10,000-piece batch requires a smaller sample percentage than a 500-piece batch.

For a batch of 500 pieces, AQL 2.5 requires inspecting 50 pieces. For a batch of 1,000 pieces, inspect 80 pieces. For a batch of 5,000 pieces, inspect 200 pieces.

AQL tables provide exact sample sizes for each batch size. Use these tables to determine the correct sample size for your order.

When to Accept vs Reject

Accept the batch if defect counts fall below AQL limits. For AQL 2.5 with 50 samples, accept if major defects are 3 or fewer. Reject if major defects exceed 3.

Reject the batch if defect counts exceed AQL limits. The manufacturer must rework or replace defective pieces. A new inspection may be required after corrections.

For critical defects, reject the batch immediately. Any critical defect is unacceptable. Do not accept goods with safety or legal compliance issues.

Third-Party AQL Inspection

Third-party inspection companies provide AQL inspection services. They are independent and unbiased. This is useful for new buyers unfamiliar with local factories.

Third-party inspectors follow international standards. They provide detailed inspection reports with photos and measurements. This documentation supports quality decisions.

Cost for third-party inspection ranges from $200 to $500 per inspection. This is a small cost compared to the cost of accepting defective goods.

AQL FAQ

Do I need AQL inspection for every order? AQL inspection is recommended for every order. Even with established relationships, quality can vary. Regular inspection ensures consistent quality.

Can I inspect more than the AQL sample size? Yes. You can inspect more pieces if you want additional assurance. However, AQL sample sizes are statistically valid and typically sufficient.

What if the manufacturer disagrees with inspection results? Use a third-party inspector for objective assessment. Document all defects with photos. Refer to AQL tables for acceptance criteria.

Should I inspect before or after shipment? Inspect before shipment. This allows you to reject defective goods before they leave the factory. Pre-shipment inspection is standard practice.

Can I change AQL levels for different garments? Yes. Use stricter AQL for critical garments. Use more lenient AQL for less critical items. Adjust based on your brand quality standards.

What if defects are found after acceptance? This is rare with proper AQL inspection. However, if issues arise after acceptance, work with the manufacturer to resolve. Document the issue for future reference.

For a complete overview of clothing manufacturers in Bangladesh — including quality control, AQL standards, and inspection — read our complete clothing manufacturers guide.