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Quality Acceptable Standard (AQL)
The inspection company uses ANSI/ ASQC Z1.4 as the quality acceptance standard by default. This method is used to sample the batch of products and determine whether the batch of products is qualified. It is not necessary to inspect all the products in the batch. This sampling acceptance standard is widely used all over the world.
FAQ
Customer Common Sampling Problems
What is acceptance sampling?
Acceptance sampling is used to decide whether to accept or reject a batch of product. First, a sample is selected from a batch of products, and the selected sample is tested, and then the batch of products is accepted or rejected based on the results.
What are the general sampling criteria?
The sampling criteria represent the accuracy of the sampling method as a whole. For a given batch of a given quantity of product, raising the quality sampling standard means increasing the number of samples. General quality sampling criteria are divided into I, II and III levels. The quality sampling standard of the inspection company is Class II by default.
What is batch/lot size? What is sample quantity?
A batch or batch of products is a collection of many products, consistent in size, type, production conditions, and time, and samples are drawn between them to determine whether the batch/batch of products meets acceptance criteria. The number of samples is the number of all samples taken to be tested.
How to determine the sampling quantity and acceptance quantity?
Assuming that a total of 5000 products in a batch are inspected, the following table shows that the sampling quantity should be 200 according to the acceptance quality standard G- II. According to the acceptance quality standards of Critical 0,Major 2.5 and Minor 4.0, the acceptable defect standards for this batch of products are: the number of serious defects is 0, the number of major defects is 10, and the number of minor defects is 14. If no serious defects are found in the randomly selected samples, more than 10 major defects or more than 14 minor defects, the batch of products are rejected.
Acceptance level and defect classification
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A serious defect is a defect that may affect the personal safety and health of the end user. Inspection company acceptance quality standard serious defect default value is 0.
Major defects are defects that may reduce the usability of the product without affecting safety. The default value of major defects in the acceptance quality standard of the inspection company is 2.5.
Minor defects will not impair the normal use of the product or deviate from the relevant standards. The secondary defect quality criterion is a process defect. Inspection company acceptance quality standard secondary defect default value is 4.0.
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