ASTM D Standard Practice for Heat Aging of Plastics Without Load 1 1 x00a0 This practice is intended to define the exposure conditions for evaluating. Standard Practice for Heat Aging of Plastics Without Load – ASTM D Status: Withdrawn · Replaced by: ASTM D Buy this standard. Price: . ASTM D(). Standard Practice for Heat Aging of Plastics Without Load. standard by ASTM International, 03/15/ This document has been.
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Please first verify your email before subscribing to alerts. Recommended procedures for determining the thermal aging characteristics of a material using a series of elevated temperatures for the purpose of estimating endurance time to a defined property change at a lower temperature are d0345 described; the applicability of the Arrhenius relation for making predictions to other temperatures, is assumed in this case.
Ultimate properties such as strength or elongation are more sensitive to degradation than bulk properties such as modulus, in most cases. This standard and ISO address the same subject matter but differ in technical content.
A plastic material is not necessarily degraded by exposure to elevated temperatures. Arrhenius principles may only be used to accelerate a chemical mechanism if there are no fundamental changes in the material properties. Other types of plastics become soft and sticky, either due to sorption of volatilized plasticizer or due to breakdown of the polymer.
It is the responsibility of the user of this standard to establish appropriate qstm, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Therefore, for any application of the CUT or the TI temperature index to be valid, either the thermal aging program must duplicate the intended thermal exposure conditions of the end product, or the Arrhenius relation must apply. Normally, additional shrinkage should be expected with loss of volatiles or advance in polymerization. Add to Alert PDF. The severity of satm exposures in both time and temperature determines the extent and type of change that takes place. We have no amendments or corrections for this standard.
The effect of elevated temperature d30455 any particular property is determined by selection f3045 the appropriate test method and test specimens for that property.
Only d045 procedure for heat exposure is specified.
Historical Version s – view previous versions of standard. If the document is revised or amended, you will be notified by email. Caution should be exercised in using the Arrhenius relation and knowledge of physical changes in the material at elevated temperatures is important.
Errors in exposure are cumulative with time. Proceed to Checkout Continue Shopping. These transitions should be avoided both in the range of aging temperatures used, as well as in extrapolation of the lifeline.
Specific properties and failure or lifetime criteria for these properties are typically chosen for the evaluation of thermal endurance. Standards Subsctiption may be the perfect solution.
With semi-crystalline and highly crystalline polymers, elevated temperatures may cause significant changes to the morphology of the material, invalidating or compromising that assumption. Recommended procedures for determining the thermal aging characteristics of a material using a series of elevated temperatures for the purpose of estimating endurance time to a defined property change at a lower temperature are also described; the applicability of the Arrhenius relation for making predictions to other temperatures, is assumed in this case.
Standard Practice for Heat Aging of Plastics Without Load
This standard is not included in any packages. On the contrary, this practice is designed to provide data which can be used for such comparative purposes. This standard is also available to be included in Standards Subscriptions. Please first log in with a verified email before subscribing to alerts. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
The property of interest is measured at room temperature. As the voice of the U. Only the procedure for heat exposure is specified. The property of interest is measured at room temperature. Subscription pricing is determined by: Certain materials are susceptible to the influence of humidity. This standard and ISO address the same subject matter but differ in technical content. Your Alert Profile lists the documents that will be monitored.
You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server. However, extended periods of exposure of plastics to elevated temperatures will generally cause some degradation, with progressive changes in physical properties.
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ASTM D – Standard Practice for Heat Aging of Plastics Without Load
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Mechanical properties, such as flexural properties, are sensitive to heat degradation and may change at a more rapid rate.
The effect of elevated temperature on any particular property is determined by selection of the appropriate test method and test specimens for that property.
However, the data obtained from axtm practice, since it does not account for the influence of stress or environment that is involved in most real life applications, must be used cautiously by the designer, who must inevitably make material choices using additional data such as creep and creep rupture that are consistent with the requirements of the specific application. Different properties, mechanical or electrical, may not change at the same rate.
Work Item s – proposed revisions of this standard. Factors that affect the reproducibility of data are the degree of temperature control of the enclosure, humidity of the oven, air velocity over the specimen, and period of exposure.