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Defects detected during visual inspection
are classified within 3 categories, ¡°Critical¡±, ¡°Major¡±
and ¡°Minor¡± and the normal definitions are:
Critical Defects :
A defect that fails to meet mandatory regulations
and/or affects the safety of the consumer when using
the product
Major Defects :
A defect that is likely to result in product failure,
reduction the usability of the product and obvious
appearance defect affecting the salability of the
product
Minor Defects :
A defect that is not likely to reduce the usability
of the product, but is likely to reduce the salability
or a discrepancy from the defined quality standard,
or not same as the original sample.
HQTS uses the MIL
STD 105E tables, which are
recognized standards by every industrial companies.
This American standard has now equivalents in all
national and international standardisation organisations.
Basically, this standard is a proven method to accept
or reject a production lot by inspecting a randomly
selected lot of products.
| Acceptable
Quality Level (AQL) |
The designated value of defects, expressed as a percentage
by the particular sampling procedure and level used
will identify what the buyer will normally accept
in the majority of cases. Different AQLs may be designed
for different defect classifications such as Critical,
Major and Minor.
Unless specified by the client, HQTS will adopt the
AQL as follows:
| |
High
valued products |
Low
valued products |
| Critical
defects |
Not
allowed |
Not
allowed |
| Major
defects |
AQL
1.0/1.5 |
AQL
2.5 |
| Minor
defects |
AQL
2.5/4.0 |
AQL
4.0 |
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