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The Retest Period has been established by review of the product’s or a comparable product’s history.
The Recommended Retest Date for individual lots may be extended subject to quality review.
Such claims must be brought within one year of shipment from Sigma-Aldrich or a Sigma-Aldrich Authorized Distributor.
Our inventory is continually monitored and swept of products approaching the expiration and re-test date.
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This commitment is demonstrated by the establishment of programs to monitor, preserve and protect the quality of our products.
We document the Quality Release Date, that is, the point in time when analytical data has been reviewed as confirming compliance with product description, specification and lot uniformity, for all products.
Product batches are blocked from shipment to customers as they approach these dates in order to allow customers to use them within the remaining period of time. Should customers need products to be supplied with specific minimum remaining expiration or re-test time, this should be communicated at the time of order entry.If extended, a new Date Retested and Recommended Retest Date will be published on the Certificate of Analysis.If Sigma-Aldrich does not retest a lot in question, we recommend that customers evaluate the product to ensure that it still matches their needed specifications.These products should be routinely inspected to ensure they perform as expected.Within our Terms and Conditions of supply, product dating, or lack thereof, does not release a customer from proper inspection when receiving goods, and does not warrant fitness of a product for any particular use.