This product is assigned a lot-specific retest date. Products that, while considered stable, may be subject to degradation over time are assigned a periodic retest date to confirm quality. The lot specific retest date is reported on the Certificate of Analysis. Please navigate to the DOCUMENTATION section of the Product Detail Page to access a Certificate under ‘Certificate of Analysis’:
https://www.sigmaaldrich.com/product/sigma/t6397#product-documentation
Full Product Dating Information may be reviewed at the link below: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/190/408/product-dating-information-ms.pdf

