ASTM-B921 › Complete Document History
Standard Specification for Non-hexavalent Chromium Conversion Coatings on Aluminum and Aluminum Alloys

Complete Current Edition:
   2008 R23 EDITION - REAPPROVED IN 2023 - Nov. 7, 2023

Obsolete Revision Information:
   2008 R18 EDITION - REAPPROVED IN 2018 - Oct. 1, 2018
   2008 R13 EDITION - Non-hexavalent Chromium Conversion Coatings on Aluminum and Aluminum Alloys - May 15, 2013
   2008 EDITION - Non-hexavalent Chromium Conversion Coatings on Aluminum and - April 1, 2008
   2002 EDITION - Non-hexavalent Chromium Conversion Coatings on Aluminum and - Sept. 10, 2002