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

Scope: 

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 the 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 test. 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. 

Read more: ASTM D6387 Capillary Gas Chromatography

Specimen size:

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

Data:

As per ASTM D6144, the individual impurities are reported to the nearest 0.1 mg/kg and purity of AMS to the nearest 0.01 wt. %.

Conclusion:

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.