AQL & Type of Defects | Texhour.com

The AQL is the maximum percent defective that for the purpose of sampling inspection can be considered satisfactory as a process average (common definition).

AQL & Type of Defects  | Texhour.com
AQL & Type of Defects

 

AQL – Acceptable Quality Level

 

"The AQL (Acceptable Quality Level) is the maximum percent defective that for the purpose of sampling inspection can be considered satisfactory as a process average” (common definition).

The AQL standards are 1.5, 2.5 & 4 it depends on the quality level and cost of the product. AQL also expressed in percent (%)

AQL is part of final inspection procedure to check whether the goods meet the AQL standards.

AQL 1.5 = Very high quality product

AQL 2.5 & 4.0 = Normal quality product

 

AQL = Number of defective products / Number of products inspected * 100

 

AQL Chart
Lot or Batch Size Sample size code letter Sample size (level 1) Acceptable Quality Level
2.5 4 6.5
Ac Re Ac Re Ac Re
2-8 A 2 0 1 0 1 0 1
9-15 B 3   1 0 1 0 1
15-25 C 5 0 1 0 1 0 1
26-50 D 8 0 1 1 2 1 2
50-90 E 13 1 2 1 2 2 3
91-150 F 20 1 2 2 3 3 4
151-280 G 32 2 3 3 4 5 6
251-500 H 50 3 4 5 6 7 8
501-1200 I 80 5 6 7 8 10 11
1201-3200 J 125 7 8 10 11 14 15
3200-10000 K 200 10 11 14 15 21 22
10001-35000 L 315 14 15 21 22 21 22

 

For Example:

If 500 pcs are inspected,

For AQL 1.5 = Number of defects must be less than 14

For AQL 2.5 = Number of defects must be less than 20

For AQL 4.0 = Number of defects must be less than 22

 

Classification of Defects:

  1. Critical Defects

  2. Major Defects

  3. Minor Defects

 

Critical:

It may be dangerous or unsafe for the customer when they used to wear.

E.g. a sharp edge, sharp buttons etc,…

 

Major:

Drop stitches, oil stain, color shade, missed embroidery etc… are considered as major defects and this affects the sales value of the product.

 

Minor:

The minor defects won't affect the sales value of the product but it may be less visible to the customers.

E.g. slub, puckering, scratches etc…