A 1,200-injection sequence on a single 2 mL vial rack ended at injection 640 with a bent autosampler needle and a run of six rejected calibrators. The septum had been punctured 640 times, which was 160 more than the vendor’s rated 480 punctures at 22 gauge. The lab had switched from 23-gauge to 22-gauge needles three months earlier to speed up the draw, and nobody recalculated the puncture life. That is the whole problem in one paragraph: 2ml vial capacity and puncture life for a give...

A lot of 2 mL vials arrived in February with a certificate of analysis showing septum thickness at 3.05 mm against a 3.00 ± 0.10 mm spec, and a microplate reader running 96 samples flagged eleven short injections in the first plate. The certificate was technically honest. The problem was the vendor had no documented control over the compression set of the butyl rubber, no incoming inspection on the septum stock, and no record of the molding press that ran the lot. That is the gap a 2ml vial...

Last spring a lot of 18,000 crimped 2 mL vials sat on a dock in New Jersey waiting for a release decision. The customer’s incoming inspector had already pulled 50 pieces and found two with septum push-through, which put the lot at roughly 4% defective on a visual attribute. Under a 2ml vial AQL sampling plan at General Inspection Level II, AQL 1.0, the accept number for n=125 is 3. Two defects in 50 tells you almost nothing. The question was whether the outgoing inspection record from...

A customer audit in 2023 turned up a calibration certificate for a batch of 2 mL vials that cited a balance serial number, a calibration date, and nothing else. No statement of what the balance measured. No uncertainty. No link to the mass of an empty vial as opposed to the mass of the water used to check the balance. The certificate looked official. It was also worthless as evidence, because it proved a balance was calibrated, not that the fill volume in those vials was traceable to a nati...