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Description of ASTM-D746 2013ASTM D746 - 13Standard Test Method for Brittleness Temperature of Plastics and Elastomers by ImpactActive Standard ASTM D746 | Developed by Subcommittee: D20.30 Book of Standards Volume: 08.01 ASTM D746Significance and Use 5.1 This test method establishes the temperature at which 50?% of the specimens tested would probably fail when subjected to the conditions specified herein. The test provides for the evaluation of long-time effects such as crystallization, or those effects that are introduced by low-temperature incompatibility of plasticizers in the material under test. Plastics and elastomers are used in many applications requiring low-temperature flexing with or without impact. Use data obtained by this method to predict the behavior of plastic and elastomeric materials at low temperatures only in applications in which the conditions of deformation are similar to those specified in this test method. This test method has been found useful for specification purposes, but does not necessarily measure the lowest temperature at which the material is suitable for use. 1. Scope 1.1 This test method covers the determination of the temperature at which plastics and elastomers (as defined by Terminology D883 ) exhibit brittle failure under specified impact conditions. Two routine inspection and acceptance procedures are also provided.
Note 1 When testing rubbers for impact brittleness use Test Method D2137 . When testing plastic sheeting for
impact brittleness, use Test Method D1790 .
1.2 The values stated in SI units are to be regarded as the standard. 1.3 Due to the potential safety and environmental hazards associated with mercury-filled thermometers, the use of alternative temperature measuring devices (such as thermocouples and RTDs) is encouraged. 1.4 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?974 address the same subject matter, but differ in technical content.
ASTM Standards D618 Practice for Conditioning Plastics for Testing D832 Practice for Rubber Conditioning For Low Temperature Testing D883 Terminology Relating to Plastics D1790 Test Method for Brittleness Temperature of Plastic Sheeting by Impact D2137 Test Methods for Rubber Property--Brittleness Point of Flexible Polymers and Coated Fabrics E1 Specification for ASTM Liquid-in-Glass Thermometers E77 Test Method for Inspection and Verification of Thermometers E608/E608M Specification for Mineral-Insulated, Metal-Sheathed Base Metal Thermocouples E1137/E1137M Specification for Industrial Platinum Resistance Thermometers ISO Standard ISO?974 Plastics--Determination of the Brittleness Temperature by Impact ISO Standards Handbook 21, Vol 1. ISO Standards are available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036.Keywords brittle failure; brittleness temperature; elastomer; impact plastics ; ICS Code ICS Number Code 83.060 (Rubber); 83.080.01 (Plastics in general) DOI: 10.1520/D0746 ASTM International is a member of CrossRef. ASTM D746The following editions for this book are also available...
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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