Significance and Use
Oxidation onset temperature is a relative measure of the degree of oxidative stability of the material evaluated at a given heating rate and oxidative environment, for example, oxygen; the higher the OOT value the more stable the material. The OOT is described in Fig. 1. The OOT values can be used for comparative purposes and are not an absolute measurement, like the oxidation induction time (OIT) at a constant temperature (see Test Method E 1858). The presence or effectiveness of antioxidants may be determined by this test method.
Typical uses of this test method include the oxidative stability of edible oils and fats (oxidative rancidity), lubricants, greases, and polyolefins.
FIG. 1 DSC Oxidation Onset Temperature (OOT), Extrapolated Onset Temperature
1.1 This test method describes the determination of the oxidative properties of hydrocarbons by differential scanning calorimetry or pressure differential scanning calorimetry under linear heating rate conditions and is applicable to hydrocarbons, which oxidize exothermically in their analyzed form.
1.2 Test Method A—A differential scanning calorimeter (DSC) is used at ambient pressure, of one atmosphere of oxygen.
1.3 Test Method B—A pressure DSC (PDSC) is used at high pressure, for example, 3.5 MPa (500 psig) oxygen.
1.4 Test Method C—A differential scanning calorimeter (DSC) is used at ambient pressure of one atmosphere of air.
1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D3350 Specification for Polyethylene Plastics Pipe and Fittings Materials
D3895 Test Method for Oxidative-Induction Time of Polyolefins by Differential Scanning Calorimetry
D4565 Test Methods for Physical and Environmental Performance Properties of Insulations and Jackets for Telecommunications Wire and Cable
D5483 Test Method for Oxidation Induction Time of Lubricating Greases by Pressure Differential Scanning Calorimetry
E473 Terminology Relating to Thermal Analysis and Rheology
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E967 Test Method for Temperature Calibration of Differential Scanning Calorimeters and Differential Thermal Analyzers
E1858 Test Method for Determining Oxidation Induction Time of Hydrocarbons by Differential Scanning Calorimetry
differential scanning calorimetry; differential thermal analysis; hydrocarbons; oxidation; oxidation induction time (OIT); oxidation onset temperature (OOT); oxidative stability; pressure differential scanning calorimetry; Differential scanning calorimetry (DSC); DSC container (pan) cleaning; Oxidation onset temperature; Oxidative stability; Pressure differential scanning calorimetry (PDSC); Differential scanning calorimetry (DSC); DSC container (pan) cleaning; Oxidation onset temperature; Oxidative stability; Pressure differential scanning calorimetry (PDSC);
ICS Number Code 17.200.10 (Heat. Calorimetry)
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