STP1326: A Proposed Reference Material for Oxidative Induction Time by Differential Scanning Calorimetry

    Blaine, RL
    Applications development manager and applications chemist, TA Instruments, Inc., New Castle, DE

    Harris, MB
    Applications development manager and applications chemist, TA Instruments, Inc., New Castle, DE

    Pages: 12    Published: Jan 1997


    Abstract

    A polyethylene film sample, inhibited with a hindered phenol antioxidant, is proposed as a Standard Reference Material for oxidative induction time (OIT) testing. The mean OIT values, derived from nine interlaboratory studies and for a number of experimental conditions, are presented. The material is found to be statistically homogeneous, a necessary condition for a reference material. Further, the effects of temperature, oxygen pressure, and storage time on the proposed reference material are explored. As a kinetic parameter, the OIT value appears to be decreasing with time but in a well behaved and predictable manner. The use of a table and graph permit the user of the material to estimate its OIT value in the future. Because the material has been thoroughly tested in a wide variety of OIT conditions, it appears to be the best currently available candidate and is offered for consideration as an OIT Reference Material.

    Keywords:

    calibration, differential scanning calorimetry, oxidation, oxidative induction time, oxidative stability, reference materials, thermal analysis


    Paper ID: STP13823S

    Committee/Subcommittee: E37.01

    DOI: 10.1520/STP13823S


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