The chain has six links, and a certificate only covers the first
Two lots of 2 mL clear crimp vials arrived from the same distributor, six weeks apart, both stamped “ISO 17025 certified supplier.” Lot A gave a silanized glass blank with a residual silanol signal at 0.4% relative area. Lot B gave 3.8%. Same part number, same certificate of analysis format, same supplier logo. The difference was not the glass. It was that Lot B’s certificate traced back to a distributor’s internal QC bench and stopped there, with no named glass plan...
