Incoming QC: the Eleven Checks That Catch a Bad Batch
By Joe Joo · 8PCK · Shantou · Updated 26 October 2026
What to check when a container arrives, in the order that catches the most problems for the least time.
A container that fails at the filling line costs ten times what it costs to reject at the door. These are the checks we run, in the order we run them.
The free Bottle Spec Checker tests whether your neck fits the closure and whether the wall survives a pump stroke.
30-second check: does your bottle pass? Open ▾
Paperwork First
Packing list against the PO, the declaration for your market, and the certificate pack. A missing declaration stops a container at customs more often than a bad bottle does.
Dimensional Checks
Weight per piece on a 0.01 g balance, wall at four points with a micrometer, neck with a go/no-go gauge, and height against the drawing.
On a multi-part pack, check the assembly: torque each thread, confirm the O-rings are present and seated, and vacuum-test one pack per carton sample.
Visual and Functional
Colour against the approved master under daylight, not office light. Then fill one with water, cap it, invert for an hour, and shake it.
What to Do With a Failure
Quarantine the pallet, photograph the failure against the specification, and send the batch number. A supplier can only fix what is documented.
Questions We Get on This
How many pieces should I inspect?
A sample per pallet for dimensions, plus a fill test on one pack per carton sample.
What is the most common failure?
Neck dimension, then weight variation between cavities.
Do I need a lab?
No. Scale, caliper, gauge and a torque meter cover most of it.
Sizes That Fit This Guide
Get a Price on This, Within One Business Day
Tell us the capacity, the neck and the quantity. You get unit price, lead time and a sample plan — not a catalogue.
Every batch is gauged at the neck and weighed. The documents travel with the shipment.