{"id":429592,"date":"2024-10-20T07:18:38","date_gmt":"2024-10-20T07:18:38","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/astm-d4274-2023-2\/"},"modified":"2024-10-26T13:54:48","modified_gmt":"2024-10-26T13:54:48","slug":"astm-d4274-2023-2","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/astm\/astm-d4274-2023-2\/","title":{"rendered":"ASTM-D4274 2023"},"content":{"rendered":"

ASTM D4274-23<\/h3>\n

Redline Standard: Standard Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of Polyols<\/h4>\n
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ASTM D4274<\/h4>\n

Scope<\/strong><\/p>\n

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1.1<\/span> 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.<\/p>\n

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1.1.1<\/span> Test Method A\u2014Acetic Anhydride Pressure Bottle,<\/span> recommended for polyesters.<\/p>\n<\/p><\/div>\n

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1.1.2<\/span> Test Method B\u2014Phthalic Anhydride Pressure Bottle,<\/span> recommended for polyethers and polyesters.<\/p>\n<\/p><\/div>\n

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1.1.3<\/span> Test Method C\u2014Phthalic Anhydride Reflux,<\/span> recommended for polyethers and polyesters.<\/p>\n<\/p><\/div>\n

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1.1.4<\/span> Test Method D\u2014Imidazole\u2013Catalyzed Phthalic Anhydride Pressure Bottle,<\/span> recommended for polyethers, polyesters, polymer polyols, and amine-initiated polyols.<\/p>\n<\/p><\/div>\n

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1.1.5<\/span> Test Method E\u2014<\/span>Imidazole-Catalyzed Pyromellitic Dianhydride Esterification<\/span>, 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).<\/p>\n<\/p><\/div>\n<\/p><\/div>\n

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1.2<\/span> Another ASTM test method for measuring hydroxyl groups is Test Method E222<\/span>.<\/p>\n<\/p><\/div>\n

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1.3<\/span> The values stated in SI units are to be regarded as the standard.<\/p>\n<\/p><\/div>\n

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1.4<\/span> 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.<\/i><\/p>\n<\/p><\/div>\n

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Note 1:<\/span> This standard, ISO\u200914900 and ISO\u20096796 address the same subject matter, but differ in technical content.<\/span><\/p>\n<\/p><\/div>\n

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1.5<\/span> This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.<\/i><\/p>\n<\/p><\/div>\n

Keywords<\/strong><\/p>\n

acetic anhydride; esterification; hydroxyl number; phthalic anhydride; polyester; polyether; polyol; pyromellitic dianhydride; titration;<\/p>\n

ICS Code<\/strong><\/p>\n

ICS Number Code 83.080.20 (Thermoplastic materials)<\/p>\n

DOI:<\/strong> 10.1520\/D4274-23<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

D4274-23 Standard Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of Polyols (Redline)<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ASTM<\/b><\/a><\/td>\n2023<\/td>\n16<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":429600,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[1179,2637],"product_tag":[],"class_list":{"0":"post-429592","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-83-080-20","7":"product_cat-astm","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/429592","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/429600"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=429592"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=429592"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=429592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}