NIST SRM 89 Certificate of Analysis UPDATE

Dear NIST Standard Reference Material Customer:

This letter is to notify the users and purchasers of NIST SRM 89 Lead-Barium Glass of the revised Certificate of Analysis (COA) dated 26 April 2021.  

This revision includes the following changes:

replaced recommended percentages for constituents to certified values in Table 1

added uncertainty estimates for certified constituents

reassigned loss of ignition (LOI) and zirconium dioxide (ZrO2) reference values as non-certified values in Table 2

added uncertainty estimates for non-certified constituents

editorial changes

Technical questions or concerns should be directed to Nicholas Sharp nicholas.sharp@nist.gov or 301-975-3926.

Please replace your existing SRM 89 COA with the revised certificate that is available on the NIST SRM web site at https://www.nist.gov/srm.