{"id":4305,"date":"2025-06-12T13:23:12","date_gmt":"2025-06-12T13:23:12","guid":{"rendered":"https:\/\/normalab.com\/normes\/astm-d2440\/"},"modified":"2025-06-12T13:33:41","modified_gmt":"2025-06-12T13:33:41","slug":"astm-d2440","status":"publish","type":"normes","link":"https:\/\/normalab.com\/en\/standards\/astm\/astm-d2440\/","title":{"rendered":"ASTM D2440"},"content":{"rendered":"<p>This test method determines the resistance of mineral transformer oils to oxidation under prescribed accelerated aging conditions. Oxidation stability is measured by the propensity of oils to form sludge and acid products during oxidation. This test method is applicable to new oils, both uninhibited and inhibited, but is not well defined for used or reclaimed oils.<a class=\"partenaire\" href=\"https:\/\/normalab.com\/partenaires\/#tamson\">Tamson<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Standard Test Method for Oxidation Stability of Mineral Insulating Oil<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3231,"menu_order":0,"template":"","meta":{"_acf_changed":false},"groupe-norme":[105],"class_list":["post-4305","normes","type-normes","status-publish","hentry","groupe-norme-astm-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ASTM D2440 - Normalab<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/normalab.com\/en\/standards\/astm\/astm-d2440\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ASTM D2440 - 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