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ASTM-D3012:2007 Edition(Redline)

ASTM-D3012:2007 Edition(Redline)

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D3012-07 Standard Test Method for Thermal-Oxidative Stability of Polypropylene Using a Specimen Rotator Within an Oven (Redline)

Published By Publication Date Number of Pages
ASTM 2007 8
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Significance and Use

Under the severe conditions of this test method, the specimens undergo degradation at a rate that is dependent upon the thermal endurance of the polypropylene material under examination.

The thermal level of this test method is considered sufficiently severe to cause failure of commercial grades of heat-stable polypropylene within a reasonable period of time. If desired, lower temperatures can be applied to estimate the performance of polypropylene materials with lower heat stability.

The technique of specimen rotation described in this test method provides an estimate of the life-temperature relationship of polypropylene. If this test method is conducted at different temperatures on the same material, a more reliable estimate of the life-temperature relationship of polypropylene is determined. This test method can be conducted at several temperatures and the data interpreted through use of the Arrhenius relation, by plotting the logarithms of times to failure against the reciprocals of the temperatures in kelvins (K). Temperatures in the range from 100 to 150 Ā° C, with intervals of 10 Ā° C, are suggested for this purpose.

The stability as determined under the prescribed test method is not directly related to the suitability of the compound for a use where different conditions prevail.

The specimen rotation technique of thermal aging increases the probability that all specimens will be exposed similarly and that the effect of temperature gradients in an oven will be minimized.

1. Scope

1.1 This test method provides a means for estimating the resistance of polypropylene, in molded form, to accelerated aging by heat in the presence of air using a forced draft oven.

1.2 The stability determined by this test method is not directly related to the suitability of the material for use when different environmental conditions prevail and shall not be used to predict performance.

Note 1

The specified thermal levels in this test method are considered sufficiently severe to cause failure of commercial grades of heat-stable polypropylene within a reasonable period of time. If desired, lower temperatures can be applied to estimate the performance of polypropylene with lower heat stabilities.

1.3 The values stated in SI units are to be regarded as the standard. The values in brackets are for information only.

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.

Note 2

This test method and ISO 4577-1983 are technically similar but different in preparation of test specimens, thickness of test specimen, measurement of the number of air flow changes in the ovens, and the number of air changes per hour required.

1.4 The purpose of this appendix is to provide a secondary method for determining the number of air exchanges that occur within the forced draft oven used for measurement of thermal oxidative stability.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D618 Practice for Conditioning Plastics for Testing D883 Terminology Relating to Plastics D3641 Practice for Injection Molding Test Specimens of Thermoplastic Molding and Extrusion Materials D4101 Specification for Polypropylene Injection and Extrusion Materials D5374 Test Methods for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation E77 Test Method for Inspection and Verification of Thermometers E220 Test Method for Calibration of Thermocouples By Comparison Techniques E608 Specification for Mineral-Insulated, Metal-Sheathed Base Metal Thermocouples E644 Test Methods for Testing Industrial Resistance Thermometers E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method E1137/E1137M Specification for Industrial Platinum Resistance Thermometers E2251 Specification for Liquid-in-Glass ASTM Thermometers with Low-Hazard Precision Liquids

ISO Standard

Part2: Determination of Properties

Keywords

aging; biaxial rotator; polypropylene; thermal aging; thermal oxidative stability;

ICS Code

ICS Number Code 83.080.20 (Thermoplastic materials)

DOI: 10.1520/D3012-07 ASTM International is a member of CrossRef.

Citing ASTM Standards

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