It has been determined that D2121 is not a valid test method for measuring polymer in AMS. A new standard is being written for polymer in AMS. D2121 is being revised to remove all references to the testing of AMS. A negative was received on the first ballot for this revised standard for not including the results from the most recent ILS. These results have been added. Comments received on the ballot have also been addressed in this revision.
Keywordsmethylstyrene; AMS; polymer; polymer content; styrene; styrene monomer;