AQL Sampling Standards Explained for Importers
Understanding AQL (Acceptable Quality Limit) sampling standards and how they apply to quality inspection when importing from China.

What is AQL?

AQL (Acceptable Quality Limit) is a widely-used standard for quality control sampling. It defines the maximum number of defective units considered acceptable in a sample size drawn from a production lot.

Common AQL Levels

For most consumer products, the standard AQL levels are: Critical defects 0%, Major defects 2.5%, Minor defects 4.0%. Some industries may use tighter or looser standards.

How Sampling Works

Inspectors use the ANSI/ASQ Z1.4 (ISO 2859-1) standard to determine the sample size based on lot size and inspection level. General Inspection Level II is the most common.

Reading AQL Results

Inspection results show the number of defects found compared to the acceptance number. If defects exceed the accept number, the lot is considered failed.

Setting Your AQL

Work with your inspection partner to set appropriate AQL levels based on your product type, market requirements, and risk tolerance.

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A complete guide to the P-Diagram (Parameter Diagram) for DFMEA analysis, covering its 6 elements, 5 noise factor categories, step-by-step construction, and how