ASTM D6144 Analysis of AMS (α-Methylstyrene) by Capillary Gas Chromatography

ASTM D6144 Analysis of AMS (α-Methylstyrene) by Capillary Gas Chromatography

The ASTM D6144 test method covers the determination of the purity of AMS (α-methyl styrene) by gas chromatography. This test method can be used to determine the purity of AMS with normal impurities present, and it can assess contaminants in AMS throughout a range of 5 to 800 mg/kg.


    The ASTM D6144 is a standard test method for capillary gas chromatography analysis of AMS  (α-Methylstyrene), and the gas chromatography equipment is calibrated using an external standard calibration procedure. Impurities common to the AMS production process, such as cumene, 3-methyl-2-cyclopentene-1-one, n-propylbenzene, tert-butylbenzene, sec-butylbenzene, and phenol have been found to be detectable with this test method. This test method is used as an internal quality control tool during AMS manufacturing process. It can also be employed in AMS development and research projects. 

    Test procedure:

    A gas chromatograph (GC) fitted with a flame ionization detector (FID) is used to assess AMS  (α-methyl styrene) for the ASTM D6144. The gas chromatograph is injected with a precisely reproducible volume of the material to be examined. An external standard methodology is used to measure the impurity peak areas and convert them to concentrations. By subtracting the sum of the impurities from 100.00, purity by GC (the AMS content) is calculated. The results are expressed as a percentage of body weight.

    Specimen size:

    A synthetic mixture of high purity AMS containing impurities is used as a test specimen for the  ASTM D6144 test procedure. 


    As per the individual impurities are reported to the nearest 0.1 mg/kg and purity of AMS to the nearest 0.01 wt. %.


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