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 Standard Practice for Heat Aging of Plastics Without Load – ASTM D Status: Withdrawn · Replaced by: ASTM D Buy this standard.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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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. Historical Version s – view previous versions of standard. 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.
If the document is revised or amended, you will be notified by email. Other types of plastics become soft and sticky, either due to sorption of volatilized plasticizer or due to breakdown of the polymer. The asttm of elevated temperature on any particular property is determined by selection of the appropriate test method and test specimens for that property.
Ultimate properties such as strength or elongation are more sensitive to degradation than bulk properties such as modulus, in most cases. The property of f3045 is measured at room temperature.
Standard Practice for Heat Aging of Plastics Without Load
It is the responsibility of the user of this standard to establish appropriate sstm, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
On the contrary, this practice is designed to provide data which can be used for such comparative purposes. Certain materials are susceptible to the influence of humidity. Errors in exposure are cumulative with time. Please first verify your email before subscribing to alerts.
Link to Active This link will always route to the current Active version of the standard. Mechanical properties, such as flexural properties, are sensitive to heat degradation and may change at a more rapid rate. Only the procedure for heat exposure is specified. Subscription d305 is determined by: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Standards Subsctiption may be the perfect solution. 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.
Different properties, mechanical or d304, may not change at the same rate. 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 aatm apply.
Specific properties and failure or lifetime criteria for these properties are typically chosen for the evaluation of thermal endurance. Arrhenius principles may only be used to accelerate a chemical mechanism if there are no fundamental changes in the material properties. Add to Alert PDF. However, the data obtained from this 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.
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. Recommended procedures for determining the thermal aging d304 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 r3045 the Arrhenius relation for asym predictions to other temperatures, is assumed in this case.
As the voice of the U. Only the procedure for heat exposure is specified.
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Work Item s – proposed revisions of this standard. These transitions should be avoided both in the range of aging temperatures used, as well as in extrapolation of the lifeline.
Proceed to Checkout Continue Shopping. For instance, the arc resistance of thermosetting compounds improves up to the carbonization point of the material. 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.
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Standard – Standard Practice for Heat Aging of Plastics Without Load ASTM D –
Caution should be exercised in using the Arrhenius relation and knowledge of physical changes in the material at elevated temperatures is important. Already Subscribed to this document. This standard and ISO address the same subject matter but differ in technical content. With semi-crystalline and highly crystalline polymers, elevated temperatures may cause significant zstm to the morphology of the material, invalidating or compromising that assumption.