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 Standard Practice for Heat Aging of Plastics Without Load – ASTM D Status: Withdrawn · Replaced by: ASTM D Buy this standard.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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A plastic material is not necessarily degraded by exposure to elevated temperatures. The effect of elevated temperature on any particular property is determined by selection of the appropriate test method and test specimens for that property.
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. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. On the contrary, this practice is designed to provide data which can be used for such comparative purposes. Historical Version s – view previous versions of standard.
ASTM D – 18 Standard Practice for Heat Aging of Plastics Without Load
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However, the data obtained from this practice, since it does not d045 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. Arrhenius principles may only be used to accelerate a chemical mechanism if there are no fundamental changes in the material properties.
Standard Practice for Heat Aging of Plastics Without Load
Other types of plastics become soft and sticky, either due to sorption of volatilized plasticizer or due to breakdown of the polymer. This standard ast ISO address the same subject matter but differ in technical content. This standard is not included in any packages. 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.
We have no amendments or corrections for this standard. 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 x3045 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.
This standard and ISO address the same subject matter but differ in technical content. This standard is also available to be included in Standards Subscriptions. Adtm transitions should be avoided both in the range of aging temperatures used, as well as in extrapolation of the lifeline. The property of interest is measured at room temperature. Certain materials are susceptible to the influence of humidity. Standards Subsctiption may be the perfect solution.
Add to Alert PDF. Subscription pricing is determined by: However, extended periods of exposure of plastics to elevated temperatures will generally cause some degradation, with progressive changes in physical properties. Normally, additional shrinkage should be expected with loss of volatiles or advance in polymerization.
The effect of elevated temperature on any particular property is determined by selection of the appropriate test method and test specimens for that property. Only the procedure for heat exposure is specified. 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.
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You may delete a document from your Alert Profile at any time. Link to Active This link will always route to the current Active version of the standard. Caution should be exercised in using the Arrhenius relation and knowledge of physical changes in the material at elevated temperatures is zstm. Your Alert Profile lists the documents that will be monitored.
Errors in exposure are cumulative with time. For instance, the arc resistance of thermosetting compounds improves up to the carbonization point of the material. Only the procedure for heat exposure is specified. Please asym log in with a verified email before subscribing to alerts. The severity of the exposures in both time and temperature determines the extent and type of change that takes place. Ultimate properties such as d3405 or elongation are more sensitive to degradation than bulk properties such as modulus, in most cases.
With semi-crystalline and highly crystalline polymers, elevated temperatures may cause significant changes to the morphology of the material, invalidating or compromising that assumption. If the document is revised or amended, you will be notified by email.