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What happens if we use expired tissue culture flasks (T-162 Flasks) for vero cel - (Jul/29/2013 )

One of my QC technician used expired t-162 flasks for vero cell passage. The cells were looking fine and there was no contamination.

Can any one suggest me how to provide justification.

-pavanisharath25-

The expiry is usually for guaranteed sterility, so most of the time this shouldn't be a problem, so long as the packaging is intact.  Some culture vessels have substances (e.g. gelatin) added that can degrade with time, I wouldn't use that sort past expiry dates.

-bob1-