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Description of ASTM-D6746 2010ASTM D6746 - 10Standard Test Method for Determination of Green Strength and Stress Relaxation of Raw Rubber or Unvulcanized CompoundsActive Standard ASTM D6746 | Developed by Subcommittee: D11.12 Book of Standards Volume: 09.01
Translated Standard: Russian ASTM D6746Significance and Use The stress-strain properties of unvulcanized rubber (either in a compound or in the raw state) are important to certain processing operations in the rubber industry. These unvulcanized rubber properties are frequently referred to as green strength. Green strength is determined primarily by the physical and chemical characteristics of polymers, such as molecular weight, tendency to crystallize, degree of branching, and so forth. It is also related to the compound formulation, particularly filler and plasticizer content, and the presence of peptizers. Green strength can be a good indication of processing behavior. It is a particularly important characteristic for all processing operations in which elongation predominates. Green strength is dependent on the test piece preparation, rate of extension, and test temperature. Therefore, a single-point method cannot be expected to give correlation between green strength and processing behavior over the whole range of processing conditions. 1. Scope 1.1 This test method covers methods to evaluate a characteristic of raw rubber or unvulcanized rubber compounds that is designated as green strength. This special strength property for uncured rubbers is an important processing performance attribute in rubber product manufacturing. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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.
ASTM Standards D412 Test Methods for Vulcanized Rubber and Thermoplastic Elastomers--Tension D1349 Practice for Rubber--Standard Temperatures for Testing D3182 Practice for Rubber--Materials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets D4483 Practice for Evaluating Precision for Test Method Standards in the Rubber and Carbon Black Manufacturing Industries Keywords green; green stress relaxation; raw rubber; rubber; stress relaxation; tensile green modulus; tensile green strength; unvulcanized compounds; yield stress; Raw rubber; Stress-strain testing; Tensile green strength; Tensile properties/testing--rubber/relatged materials; Unvulcanized compounds; ICS Code ICS Number Code 83.040.20 (Rubber compounding ingredients) DOI: 10.1520/D6746-10 ASTM International is a member of CrossRef. ASTM D6746The following editions for this book are also available...This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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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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