Product AQL Quality inspection services from China, Asia & International

A product or series of products produced, always appearing with its defect (never perfect 100%). That is why you need AIM Control (AIM Group®) product AQL quality inspection services!

AIM’s product AQL quality inspection services offered for 2 main purposes

1. First: To identify how many defects from the product (shipment) which can be accepted for sale/buy in the international trade market?
2. Second: To control risks, prevent of defects and management.

The supplier is not expected to deliver defect-free goods.

The buyer needs to control the quality of purchased goods defects in within the allowable limits.

HOW TO SET THE LIMIT BETWEEN ACCEPTABILITY AND REFUSAL

What is the AQL in standards?

AQL is Acceptance Quality Limit in quality inspections and control, AQL stands used for ‘Defect Limit‘ is defined as the quality level in ISO 2859-1: Edition (year of revision)

What is AQL in manufacturing used?

AQL stands used in manufacturing to measure results of Quality Assurance for ensuring product quality of workflows & fabrication and limit the number of defects.

What is AQL in international trading used?

For the purpose of bringing the best benefits to consumers, protecting brands and also a tool to prevention of risks, state management

• Pre-Shipment Inspections
• Production Monitoring
• Sorting
• Factory vendor product and goods inspections
• Factory Audits
• Product Testing

What is a QC Inspector & Quality inspecting?

Quality control inspectors typically do the following:

• Read blueprints and specifications.
• Monitor operations to ensure that they meet production standards.
• Recommend adjustments to the assembly or production process.
• Inspect, test, or measure materials or products being produced.
• Recommendation & prevention quality problem from occurring for products
• Statistics & Report

What are Defects?

There are a three of defects as CRITICAL / MAJOR / MINOR which are consisted of followings:

• Defect products
• Incomplete shipments
• Missing parts
• Wrong labels
• Poor workmanship
• Qualified and Experienced

How do you calculate defects?

The formula of defect is the rate of the number of defective products that are inspected and found in the number of LOT SIZE samples calculated for per its total shipment.

• Critical defects: totally unacceptable, a user might get harmed, or regulations are not respected (ZERO)
• Major defects: these products would usually not be considered acceptable by the end user (2.5% Max)
• Minor defects: there is some departure from specifications, but most users would not mind it (4.0% Max)

What is AQL in sampling plan?

The sampling plan mentioned in AQL is very detailed but only the method.

The product AQL quality inspection service is done exactly what completely depends ON THE EXPERIENCE OF THE QUALITY INSPECTOR who carries out the sampling process for inspection.

IF SAMPLING IS WRONG, THE TEST RESULTS WILL BE WRONG

With 50 years of experience in product AQL Quality inspection services,  AIM Control (AIM Group®) We always did/do accuracy the sampling and inspecting

• What are kind of product inspected?
• What is the number of products in the shipment (lot size)?
• How are goods being packed?
• How is shipment being storage?
• Which inspection level of AQL limited is used for inspecting?
• Stevedore & workers and lifting equipment
• Sampling tools and inspection zone
• Where of positions to be sampled? Number of samples to be picked?
• Sampling how to represent the entire shipment?

Either only one product, the lot size is the total batch quantity or ordering different products, separating lot. (The quantity of each product is the lot size)?.

THE TERM "RANDOM SAMPLING" IS WRONG IN INSPECTION

In quality inspections, the number of defective products is only one of the criteria.

AQL QC sampling Misconceptions about the quality control industry are common, particularly when it comes to managing product quality from a lot of people including quality inspectors and assessors

What is AQL inspection level?

The inspection level sets the relative amount of inspection to be carried out. ISO 2859 provides 7 inspection levels but the general inspection levels (I, II and III). Level I is the least demanding and Level III is the most demanding.

EX:

• “AQL is 1.5%” means “it is no more than 1.5% defective items in the whole order quantity”
• AQL 2.5 is common criteria while shipment inspection for Garment exporters and apparel buyers to be used usually.
• .65 AQL means that no more than 1% of the batch can be defective

Different inspection levels will be different numbers of samples to inspect and the AQL limits appropriate for each market (setting of a lower AQL for both major and minor defects if customers accept very few defects.

Symbols and abbreviations

• Ac: acceptance number
• AQL: acceptance quality limit (in percent nonconforming items or in nonconformities per hundred items)
• AOQ: average outgoing quality (in percent nonconforming items or in nonconformities per hundred items)
• AOQL: average outgoing quality limit (in percent nonconforming items or in nonconformities per hundred items)
• CRQ: consumer's risk quality (in percent nonconforming items or in nonconformities per hundred items)
• d: number of nonconforming items (or nonconformities) found in a sample from a lot
• D: number of nonconforming items in a lot
• LQ: limiting quality (in percent nonconforming items or in nonconformities per hundred items)
• N: lot size
• n: sample size
• P: process average
• Px: quality level for which the probability of acceptance is x, where x is a fraction
• Pa: probability of acceptance (in percent)
• Re: rejection number
• PPM: 1/1,000,000

Recommendation

• ISO 2859-1 definition of the AQL is confusing only.
• The actual number of defectives that a particular plan allows as the UPPER confidence limit of the AQL value.
• ISO 2859-1 standard is generally, there are other equivalent commercial standards in different countries.
• In some specific cases, AQL cannot be used because of its limitation

Contact AIM