1.1 ,These test methods cover measurement by infrared absorption spectrophotometry of the 1378.4-cm−,1 (7.255-μ,m) band in polyethylene due to methyl groups. (1, 2, 4-7)2 Two test methods are covered:
1.1.1 ,Test Method A ,uses compensation with a standard sample film or wedge of known methyl content.
