1.1 This test method is designed to determine the content of nitroxide radical 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl in butadiene, isoprene, and styrene in the concentration range of 1 to 100 mg kg. 1.2 This test method is designed to determine the content of commercial product Dewaxol (trademark) and Inflow (trademark) in butadiene, isoprene, and styrene in the concentration range of 0.0002 to 0.02 %. 1.3 This test method is designed to determine the content of nitroxide radical 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl in commercial products Dewaxol and Inflow in the concentration range of 1 to 35 %. 1.4 Units--The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard. 1.5 Any person sampling or handling this product should have consulted a Safety Data Sheet (SDS) for specific first aid instructions and information on the proper equipment to have available for use in the event of personal contact or exposure. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Keywordsnitroxide radical; 4-hydroxy-2,2,6,6-tetramethylpiperidine-l-oxyl; TEMPO, butadiene; styrene; isoprene; Dewaxol; Inflow; cyclic voltammetry method
Nitroxide radicals (H-Tempo, O-Tempo, and so forth) are widely used as inhibitors of thermopolymerization in the processes of transportation, storage, and separation of monomers (isoprene, butadiene, styrene, and so forth). This test method provides procedure for assaying nitroxide radicals in of monomers.
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Withdrawn From Balloting
Ballot Item Approved as D8301-2021 and Pending Publication