FMBF Flexible Build-up Film
\nUltra-Thin Solution for SAP&mSAP Multilayer PCBs<\/b><\/span><\/span><\/h2><\/div>Next-Generation Flexible Build-up Material Engineered for mSAP \/ SAP Processes
\nHigh Flexibility \u00d7 High Thermal Resistance \u00d7 Low Dielectric \u00d7 High Reliability
\nEnabling full performance upgrades for 5G, bendable, and ultra-thin circuit designs<\/span><\/p>\n<\/div><\/div>![](\"https:\/\/microcosm.com.cn\/wp-content\/uploads\/2026\/03\/web013-13.png\" "\\"web013-13\\"")
<\/span><\/div>Contact Us<\/span><\/a><\/div><\/div><\/div><\/div><\/div><\/div>The Evolution from Rigid to Flexible: FMBF \u2013 Making Electronics Lighter, Thinner, and More Durable<\/b><\/span><\/span><\/h2><\/div>FMBF (Flexible Microcosm Build-up Film)<\/span><\/strong> is a high-performance, ultra-thin build-up material specifically developed for multilayer PCBs, mSAP, and SAP manufacturing processes.<\/p>\nIt combines flexibility, high thermal resistance, low dielectric properties, and excellent reliability, making it ideal for 5G high-frequency\/high-speed transmission modules, flexible substrates, and bendable packaging architectures.<\/p>\n
With high adhesion strength and outstanding long-term environmental stability, FMBF Flexible build-up film withstands demanding fabrication processes and harsh end-use conditions\u2014serving as a key enabling material for thinner, finer, and faster electronic products.<\/p>\n<\/div><\/div><\/div>
<\/div><\/div>![](\"https:\/\/microcosm.com.cn\/wp-content\/uploads\/2025\/12\/FMBF-\u6de1\u9ec3\u81a0\u9ad4\u652a\u62cc.png\")
<\/a><\/span><\/div><\/div><\/div><\/div><\/div>Common Challenges and Limitations<\/b><\/span><\/span><\/h2><\/div><\/div><\/div>As electronic products advance toward higher layer counts, multifunctionality, bendability, and lightweight designs, build-up materials are expected to meet increasingly stringent demands:<\/p>\n<\/div>
\n- Ultra-thin substrates prone to warpage or insufficient bending durability<\/li>\n
- 5G PCBs require extremely low-loss dielectric properties<\/li>\n
- High-temperature processes demand superior material stability<\/li>\n
- SAP processes require strong surface adhesion for electroplated copper<\/li>\n
- Insufficient electrical reliability may lead to CAF or HAST failures<\/li>\n<\/ul>\n<\/div>
Conventional stacked or build-up materials often fail to simultaneously deliver flexibility, heat resistance, and low dielectric performance. FMBF<\/strong> was developed to overcome these challenges.<\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div>Product Advantages<\/b><\/span><\/span><\/h2><\/div>\n\n\n\n\nFeature<\/strong><\/th>\nDescription<\/th>\n Product Values<\/th>\n<\/tr>\n<\/thead>\n \n\nFlexibility & Bendability<\/span><\/td>\n Flexible structure; retains flexibility after build-up<\/span><\/td>\n Greater design freedom; ideal for FPC and foldable devices<\/span><\/td>\n<\/tr>\n\nExcellent Adhesion<\/span><\/td>\n >0.5 kg\/cm\uff08Plated Cu \/ FMBF\uff09<\/span><\/td>\n Prevents delamination; improves yield and reliability<\/span><\/td>\n<\/tr>\n\nHigh Thermal Resistance<\/span><\/td>\n 288\u00b0C\uff0c5 cycles PASS<\/span><\/td>\n Withstands high-temperature lamination, curing, and thermal shock<\/span><\/td>\n<\/tr>\n\nLow Dielectric Properties<\/span><\/td>\n Dk = 2.44\u3001Df = 0.0023\uff0810 GHz\uff09<\/span><\/td>\n Optimal for 5G and high-speed transmission with minimal signal loss<\/span><\/td>\n<\/tr>\n\nHigh Environmental Reliability<\/span><\/td>\n CAF >1000 Hr\u3001HAST PASS<\/span><\/td>\n Significantly extends product service life<\/span><\/td>\n<\/tr>\n\nUltra-Thin Process Compatibility<\/span><\/td>\n Supports 25 \u00b5m films and multilayer stacking<\/span><\/td>\n Ideal for thin devices and High-Density-Interconnect HDI designs<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div><\/div>
Next-Generation Flexible Build-up Material Engineered for mSAP \/ SAP Processes FMBF (Flexible Microcosm Build-up Film)<\/span><\/strong> is a high-performance, ultra-thin build-up material specifically developed for multilayer PCBs, mSAP, and SAP manufacturing processes.<\/p>\n It combines flexibility, high thermal resistance, low dielectric properties, and excellent reliability, making it ideal for 5G high-frequency\/high-speed transmission modules, flexible substrates, and bendable packaging architectures.<\/p>\n With high adhesion strength and outstanding long-term environmental stability, FMBF Flexible build-up film withstands demanding fabrication processes and harsh end-use conditions\u2014serving as a key enabling material for thinner, finer, and faster electronic products.<\/p>\n<\/div><\/div><\/div> As electronic products advance toward higher layer counts, multifunctionality, bendability, and lightweight designs, build-up materials are expected to meet increasingly stringent demands:<\/p>\n<\/div> Conventional stacked or build-up materials often fail to simultaneously deliver flexibility, heat resistance, and low dielectric performance. FMBF<\/strong> was developed to overcome these challenges.<\/p>\n<\/div><\/div><\/div><\/div><\/div>
\nHigh Flexibility \u00d7 High Thermal Resistance \u00d7 Low Dielectric \u00d7 High Reliability
\nEnabling full performance upgrades for 5G, bendable, and ultra-thin circuit designs<\/span><\/p>\n<\/div><\/span><\/div>The Evolution from Rigid to Flexible: FMBF \u2013 Making Electronics Lighter, Thinner, and More Durable<\/b><\/span><\/span><\/h2><\/div>
<\/a><\/span><\/div><\/div><\/div><\/div><\/div>Common Challenges and Limitations<\/b><\/span><\/span><\/h2><\/div><\/div><\/div>
\n
Product Advantages<\/b><\/span><\/span><\/h2><\/div>\n
\n\n
\n Feature<\/strong><\/th>\n Description<\/th>\n Product Values<\/th>\n<\/tr>\n<\/thead>\n \n\n Flexibility & Bendability<\/span><\/td>\n Flexible structure; retains flexibility after build-up<\/span><\/td>\n Greater design freedom; ideal for FPC and foldable devices<\/span><\/td>\n<\/tr>\n \n Excellent Adhesion<\/span><\/td>\n >0.5 kg\/cm\uff08Plated Cu \/ FMBF\uff09<\/span><\/td>\n Prevents delamination; improves yield and reliability<\/span><\/td>\n<\/tr>\n \n High Thermal Resistance<\/span><\/td>\n 288\u00b0C\uff0c5 cycles PASS<\/span><\/td>\n Withstands high-temperature lamination, curing, and thermal shock<\/span><\/td>\n<\/tr>\n \n Low Dielectric Properties<\/span><\/td>\n Dk = 2.44\u3001Df = 0.0023\uff0810 GHz\uff09<\/span><\/td>\n Optimal for 5G and high-speed transmission with minimal signal loss<\/span><\/td>\n<\/tr>\n \n High Environmental Reliability<\/span><\/td>\n CAF >1000 Hr\u3001HAST PASS<\/span><\/td>\n Significantly extends product service life<\/span><\/td>\n<\/tr>\n \n Ultra-Thin Process Compatibility<\/span><\/td>\n Supports 25 \u00b5m films and multilayer stacking<\/span><\/td>\n Ideal for thin devices and High-Density-Interconnect HDI designs<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div><\/div>
![](\"https:\/\/microcosm.com.cn\/wp-content\/uploads\/2026\/02\/Gemini_Generated_Image_qvcrbqqvcrbqqvcr.png\")
<\/a><\/span><\/div><\/div><\/div>![](\"https:\/\/microcosm.com.cn\/wp-content\/uploads\/2026\/02\/Gemini_Generated_Image_plnenjplnenjplne.png\")
<\/a><\/span><\/div><\/div><\/div><\/div><\/div>![\"FMBF](\"https:\/\/microcosm.com.cn\/wp-content\/uploads\/2026\/02\/\u88fd\u7a0b\u6d41\u7a0b.png\" "\\"\u88fd\u7a0b\u6d41\u7a0b\\"")
<\/span><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":4873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[223],"tags":[],"class_list":["post-6605","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fpcbnpcb-en"],"acf":[],"_links":{"self":[{"href":"https:\/\/microcosm.com.cn\/zh_tw\/wp-json\/wp\/v2\/posts\/6605","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/microcosm.com.cn\/zh_tw\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/microcosm.com.cn\/zh_tw\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/microcosm.com.cn\/zh_tw\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/microcosm.com.cn\/zh_tw\/wp-json\/wp\/v2\/comments?post=6605"}],"version-history":[{"count":35,"href":"https:\/\/microcosm.com.cn\/zh_tw\/wp-json\/wp\/v2\/posts\/6605\/revisions"}],"predecessor-version":[{"id":8213,"href":"https:\/\/microcosm.com.cn\/zh_tw\/wp-json\/wp\/v2\/posts\/6605\/revisions\/8213"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/microcosm.com.cn\/zh_tw\/wp-json\/wp\/v2\/media\/4873"}],"wp:attachment":[{"href":"https:\/\/microcosm.com.cn\/zh_tw\/wp-json\/wp\/v2\/media?parent=6605"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/microcosm.com.cn\/zh_tw\/wp-json\/wp\/v2\/categories?post=6605"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/microcosm.com.cn\/zh_tw\/wp-json\/wp\/v2\/tags?post=6605"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}