{"id":696938,"date":"2024-11-06T05:45:35","date_gmt":"2024-11-06T05:45:35","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/wrc-4421999\/"},"modified":"2024-11-06T05:45:35","modified_gmt":"2024-11-06T05:45:35","slug":"wrc-4421999","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/wrc\/wrc-4421999\/","title":{"rendered":"WRC 442:1999"},"content":{"rendered":"<p>WRC Bulletin 442 summarizes an extensive program on Polytetrafluoroethylene (PTFE) gaskets. From 1993 to 1995, tests were sponsored by eleven gasket producers and users in an effort to develop a protocol for qualifying the tightness and hot performance of PTFE gaskets based on a measure of their margin of safety against gross leakage and on their mechanical and tightness resistance to extremely high loading. Over two hundred sophisticated tests were performed on twenty-seven PTFE based products including hot blow-out tests at various pressures in various test fixtures and room temperature tightness tests (ROTT tests) including a crush load sequence. These tests define and refine the necessary safety margins on relaxation, gross leak (blow-out) and tightness for these materials. The resulting protocol contains requirements for tests involving hot relaxation, gross leakage (blow-out) resistance, gasket constants and high stress performance (crush). The protocol is intended to accommodate all foreseeable types of PTFE based gasket products and makes use of a special NPS 3 Class 150 fixture which was developed and proven for the hot gross leak aspect of the qualification scheme.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Polytetrafluoroethylene (PTFE) Gasket Qualification<\/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\/wrc\/\"><b>WRC<\/b><\/a><\/td>\n<td>1999<\/td>\n<td>57<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":696948,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2677],"product_tag":[],"class_list":{"0":"post-696938","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-wrc","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/696938","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\/696948"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=696938"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=696938"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=696938"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}