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Description of ASTM-D4274 2005ASTM D4274-05Historical Standard: Standard Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of PolyolsASTM D4274Scope 1.1 These test methods measure the hydroxyl groups in polyester and polyether polyols containing primary and secondary hydroxyl groups. They also apply to many other hydroxyl-containing substances. 1.1.1 Test Method A-Acetic Anhydride Pressure Bottlerecommended for polyesters. 1.1.2 Test Method B-Phthalic Anhydride Pressure Bottlerecommended for polyethers and polyesters. 1.1.3 Test Method C-Phthalic Anhydride Refluxrecommended for polyethers and polyesters. 1.1.4 Test Method D-Imidazole-Catalyzed Phthalic Anhydride Pressure Bottlerecommended for polyethers, polyesters, polymer polyols, and amine-initiated polyols. 1.1.5 Test Method EImidazole-Catalyzed Pyromellitic Dianhydride Esterification, recommended for polyols used for flexible and rigid polyurethane foams and urethane elastomers. It is recommended for polyester polyols, polyether polyols, amine-started polyols, and polymer polyols (polyacrylonitrile/copolystyrene-based). 1.2 Other ASTM test methods for measuring hydroxyl groups are Test Methods D 1957 and E 222 (see Note 0). Note 1—Test Method C is essentially similar to ISO 6796-1981, but there are some differences in the concentrations used and some procedural details. There are currently no data available for comparing the results of Test Method C to those of ISO 6796-1981. 1.3 The values stated in SI units are to be regarded as the standard. 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. Keywords acetic anhydride; esterification; hydroxyl number; phthalic anhydride; polyester; polyether; polyol; pyromellitic dianhydride; titration ICS Code ICS Number Code 83.080.20 (Thermoplastic materials) DOI: 10.1520/D4274-05 The 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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