Q: What defect classes apply in zipper AQL inspection?
Three classes are usual. Critical defects create an unsafe condition or a legal violation: sharp edges, a detached small part on children's wear, a needle fragment, a prohibited substance. Major defects make the product fail its function or its specification: a slider that does not lock, a chain that separates under normal load, a length outside tolerance, a wrong colour. Minor defects affect appearance but not function: a light stain, a loose thread, a slight tape bow.
Write the class definitions into the inspection sheet with a photograph of each example, so that two inspectors reach the same decision. Measure what can be measured — length, slider gap, colour against the approved standard — and use the agreed limits rather than personal judgement. For colour, compare under a defined light source against the approved sample, because shade is the defect most often disputed.
Acceptance is judged per class against the AQL you set, with critical defects at zero. Total the counts, compare with the acceptance number, and record the decision with the evidence. A rejected lot should carry photographs and a defect list so the supplier can act on the specific cause.