{"id":689994,"date":"2024-11-06T05:20:33","date_gmt":"2024-11-06T05:20:33","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/tappi-um-5732015\/"},"modified":"2024-11-06T05:20:33","modified_gmt":"2024-11-06T05:20:33","slug":"tappi-um-5732015","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/tappi\/tappi-um-5732015\/","title":{"rendered":"TAPPI UM 573:2015"},"content":{"rendered":"<p>This method is for the determination of water vapor permeability of paper, paperboard, and flexible packaging materials under storage conditions at -18\u00b0C (0\u00b0F). It is generally suitable for sheet materials up to 125 \u00b5m (5 mils) thick. The method has been developed because of increased emphasis on frozen-food production, and because no existing procedure gives results which correlate with those at -18\u00b0C. [TAPPI T 448 &#034;Water Vapor Transmission Rate of Sheet Materials at Standard Temperature and Humidity&#034; is suitable at temperatures of 23\u00b0C (73\u00b0F) and 50% relative humidity, and TAPPI T 464 &#034;Gravimetric Determination of Water Vapor Transmission Rate of Sheet Materials at High Temperature and Humidity&#034; applies at 38\u00b0C (100\u00b0F) and 90% RH.]<\/p>\n<p> In general, packaging materials used for storage at -18\u00b0C should be capable of protection against an appreciable loss of moisture for periods up to 1 or 2 years. The final selection of materials for such storage is probably best done by actual package storage tests for the full length of time required. This method is a simplified and rapid method which has been shown to give results indicative of behavior during long-term storage. Many of the packaging materials are based on cellulose, including paper, paperboard, cellophane, and glassine. The time required for these materials to reach moisture equilibrium when exposed at -18\u00b0C may be several weeks or months. The assumption is made in this procedure that equilibrium is reached, for practical purposes, in the 7-day initial conditioning period.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Water Vapor Permeability of Sheet Materials at -18 Degrees C (0 Degrees F)<\/b><\/p>\n<table style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/tappi\/\"><b>TAPPI<\/b><\/a><\/td>\n<td>2015-03-18<\/td>\n<td>5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":0,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2661],"product_tag":[],"class_list":{"0":"post-689994","1":"product","2":"type-product","3":"status-publish","5":"product_cat-tappi","7":"first","8":"instock","9":"sold-individually","10":"shipping-taxable","11":"purchasable","12":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/689994","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:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=689994"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=689994"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=689994"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}