{"id":1014,"date":"2026-04-17T23:32:19","date_gmt":"2026-04-18T03:32:19","guid":{"rendered":"https:\/\/www.songhaiflange.com\/?p=1014"},"modified":"2026-04-17T23:43:05","modified_gmt":"2026-04-18T03:43:05","slug":"flange-facing-types-rf-ff-rtj-mfm-tg-sealing-surface-comparison","status":"publish","type":"post","link":"https:\/\/www.songhaiflange.com\/pa\/2026\/04\/17\/flange-facing-types-rf-ff-rtj-mfm-tg-sealing-surface-comparison\/","title":{"rendered":"Flange Facing Types RF FF RTJ MFM TG Sealing Surface Comparison"},"content":{"rendered":"<h2>Flange Facing Types Explained<\/h2>\n<p>The flange facing (sealing surface) is critical for creating a leak-tight joint. Different facing types are designed for specific pressure ranges, temperatures, and sealing requirements.<\/p>\n<h3>\u0a09\u0a2d\u0a30\u0a3f\u0a06 \u0a39\u0a4b\u0a07\u0a06 \u0a1a\u0a3f\u0a39\u0a30\u0a3e (RF)<\/h3>\n<p><strong>Most Common Type<\/strong><\/p>\n<ul>\n<li>Raised sealing surface (1.6mm or 6.4mm height)<\/li>\n<li>Concentric or spiral serrations for gasket grip<\/li>\n<li>Suitable for Class 150-2500<\/li>\n<li>Works with soft, semi-metallic, and metallic gaskets<\/li>\n<li><strong>\u0a35\u0a30\u0a24\u0a4b\u0a02:<\/strong> General service, oil and gas, chemical processing<\/li>\n<\/ul>\n<h3>\u0a1a\u0a2a\u0a1f\u0a3e \u0a1a\u0a3f\u0a39\u0a30\u0a3e (FF)<\/h3>\n<p><strong>Full Surface Sealing<\/strong><\/p>\n<ul>\n<li>Entire flange face is sealing surface<\/li>\n<li>Requires full-face gasket<\/li>\n<li>Limited to Class 150 and Class 300<\/li>\n<li>Prevents flange bending under bolt load<\/li>\n<li><strong>\u0a35\u0a30\u0a24\u0a4b\u0a02:<\/strong> Low-pressure water, cast iron flanges, plastic-lined systems<\/li>\n<\/ul>\n<h3>\u0a30\u0a3f\u0a70\u0a17 \u0a15\u0a3f\u0a38\u0a2e \u0a26\u0a3e \u0a1c\u0a4b\u0a5c (RTJ)<\/h3>\n<p><strong>High Pressure Metal-to-Metal Seal<\/strong><\/p>\n<ul>\n<li>Groove for metal ring gasket (oval or octagonal)<\/li>\n<li>Metal-to-metal contact for superior sealing<\/li>\n<li>Suitable for Class 600 and above<\/li>\n<li>Handles extreme temperatures and pressures<\/li>\n<li><strong>\u0a35\u0a30\u0a24\u0a4b\u0a02:<\/strong> High-pressure steam, oil and gas wellheads, refineries<\/li>\n<\/ul>\n<h3>\u0a2e\u0a30\u0a26-\u0a14\u0a30\u0a24 \u0a26\u0a3e \u0a1a\u0a3f\u0a39\u0a30\u0a3e (MFM)<\/h3>\n<p><strong>Self-Aligning Sealing<\/strong><\/p>\n<ul>\n<li>One flange has raised male portion, other has recessed female<\/li>\n<li>Gasket sits in female recess for better alignment<\/li>\n<li>Reduced gasket blowout risk<\/li>\n<li><strong>\u0a35\u0a30\u0a24\u0a4b\u0a02:<\/strong> Pump and valve connections, heat exchangers<\/li>\n<\/ul>\n<h3>Tongue-Groove Face (TG)<\/h3>\n<p><strong>Premium Sealing Performance<\/strong><\/p>\n<ul>\n<li>Tongue on one flange fits into groove on mating flange<\/li>\n<li>Excellent gasket containment<\/li>\n<li>Superior sealing for hazardous media<\/li>\n<li>Higher cost due to precision machining<\/li>\n<li><strong>\u0a35\u0a30\u0a24\u0a4b\u0a02:<\/strong> Toxic gases, high-pressure hydraulic systems<\/li>\n<\/ul>\n<h3>Facing Selection Guide<\/h3>\n<table>\n<tr>\n<th>Facing Type<\/th>\n<th>Pressure Range<\/th>\n<th>Temperature<\/th>\n<th>Cost<\/th>\n<\/tr>\n<tr>\n<td>\u0a1a\u0a2a\u0a1f\u0a3e \u0a1a\u0a3f\u0a39\u0a30\u0a3e (FF)<\/td>\n<td>Low (Class 150-300)<\/td>\n<td>Moderate<\/td>\n<td>Low<\/td>\n<\/tr>\n<tr>\n<td>\u0a09\u0a2d\u0a30\u0a3f\u0a06 \u0a39\u0a4b\u0a07\u0a06 \u0a1a\u0a3f\u0a39\u0a30\u0a3e (RF)<\/td>\n<td>Medium-High (Class 150-2500)<\/td>\n<td>Wide<\/td>\n<td>Medium<\/td>\n<\/tr>\n<tr>\n<td>MFM<\/td>\n<td>Medium-High<\/td>\n<td>Wide<\/td>\n<td>Medium-High<\/td>\n<\/tr>\n<tr>\n<td>TG<\/td>\n<td>High<\/td>\n<td>Wide<\/td>\n<td>High<\/td>\n<\/tr>\n<tr>\n<td>\u0a06\u0a30\u0a1f\u0a40\u0a1c\u0a47<\/td>\n<td>Very High (Class 600+)<\/td>\n<td>Extreme<\/td>\n<td>High<\/td>\n<\/tr>\n<\/table>\n<h3>Gasket Compatibility<\/h3>\n<ul>\n<li><strong>RF\/FF:<\/strong> Non-asbestos, graphite, PTFE, spiral wound<\/li>\n<li><strong>RTJ:<\/strong> Soft iron, stainless steel, Inconel ring gaskets<\/li>\n<li><strong>MFM\/TG:<\/strong> Sheet gaskets, spiral wound with centering ring<\/li>\n<\/ul>\n<p>Choosing the correct flange facing type is essential for ensuring leak-free operation and optimal sealing performance in your piping system.<\/p>\n<p><strong>\u0a35\u0a1f\u0a38\u0a10\u0a2a:<\/strong>\u00a0+86-18658777855<br \/>\n<strong>\u0a08\u0a2e\u0a47\u0a32:<\/strong>\u00a01007788887@qq.com<br \/>\n<a href=\"https:\/\/www.720yun.com\/vr\/a6ajt7ynrw0\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-884\" src=\"http:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4.webp\" alt=\"\" width=\"1290\" height=\"2317\" srcset=\"https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4.webp 1290w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-167x300.webp 167w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-570x1024.webp 570w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-768x1379.webp 768w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-855x1536.webp 855w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-1140x2048.webp 1140w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-7x12.webp 7w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-416x747.webp 416w\" sizes=\"auto, (max-width: 1290px) 100vw, 1290px\" \/><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Flange Facing Types Explained The flange facing (sealing surface) is critical for creating a leak-tight joint. Different facing types are designed for specific pressure ranges, temperatures, and sealing requirements. Raised Face (RF) Most Common Type Raised sealing surface (1.6mm or 6.4mm height) Concentric or spiral serrations for gasket grip Suitable for Class 150-2500 Works with [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[71,66,88,92,91],"class_list":["post-1014","post","type-post","status-publish","format-standard","hentry","category-blog","tag-facing","tag-flange","tag-gasket","tag-raised","tag-rtj"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.songhaiflange.com\/pa\/wp-json\/wp\/v2\/posts\/1014","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflange.com\/pa\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflange.com\/pa\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/pa\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/pa\/wp-json\/wp\/v2\/comments?post=1014"}],"version-history":[{"count":2,"href":"https:\/\/www.songhaiflange.com\/pa\/wp-json\/wp\/v2\/posts\/1014\/revisions"}],"predecessor-version":[{"id":1019,"href":"https:\/\/www.songhaiflange.com\/pa\/wp-json\/wp\/v2\/posts\/1014\/revisions\/1019"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflange.com\/pa\/wp-json\/wp\/v2\/media?parent=1014"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/pa\/wp-json\/wp\/v2\/categories?post=1014"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/pa\/wp-json\/wp\/v2\/tags?post=1014"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}