{"id":152,"date":"2014-11-27T10:31:13","date_gmt":"2014-11-27T10:31:13","guid":{"rendered":"http:\/\/www.rigiflex.com\/blog\/?p=152"},"modified":"2025-06-16T13:40:33","modified_gmt":"2025-06-16T13:40:33","slug":"how-to-improve-reliability-flexibility-in-an-8-layer-stackup-flex","status":"publish","type":"post","link":"https:\/\/www.rigiflex.com\/blog\/how-to-improve-reliability-flexibility-in-an-8-layer-stackup-flex\/","title":{"rendered":"How to Improve Reliability &#038; Flexibility in an 8 Layer Stackup Flex?"},"content":{"rendered":"<p align=\"justify\">When designing a flex PCB stackup, the fabricator might face some restrictions in enhancing the reliability of the board. Today, we will discuss ways to improve the reliability of a board by increasing the flexibility and improving design considerations of a multilayer PCB stackup. These steps can be implemented for PCB stackup designs as seen in <a href=\"https:\/\/www.rigiflex.com\/products-services\/flexible-pcb\/8-layer-flex\">8 layer flex PCBs.<\/a><\/p>\n<p align=\"justify\"><a href=\"https:\/\/www.rigiflex.com\/blog\/wp-content\/uploads\/2014\/11\/152.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1427 size-full\" src=\"https:\/\/www.rigiflex.com\/blog\/wp-content\/uploads\/2014\/11\/152.png\" alt=\"8 layer stack up flex\" width=\"1200\" height=\"400\" srcset=\"https:\/\/www.rigiflex.com\/blog\/wp-content\/uploads\/2014\/11\/152.png 1200w, https:\/\/www.rigiflex.com\/blog\/wp-content\/uploads\/2014\/11\/152-300x100.png 300w, https:\/\/www.rigiflex.com\/blog\/wp-content\/uploads\/2014\/11\/152-768x256.png 768w, https:\/\/www.rigiflex.com\/blog\/wp-content\/uploads\/2014\/11\/152-1024x341.png 1024w, https:\/\/www.rigiflex.com\/blog\/wp-content\/uploads\/2014\/11\/152-1140x380.png 1140w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/a><\/p>\n<p align=\"justify\"><strong>Improve Flexibility by Reducing Overall Thickness<\/strong><\/p>\n<p align=\"justify\">You can execute all or some of the below mentioned steps to lower the overall thickness of the PCB. A thinner PCB stackup will allow it to be more flexible.<\/p>\n<div align=\"justify\">\n<ul>\n<li>Reduce the base copper weight.<\/li>\n<li>Reduce the adhesive thickness.<\/li>\n<li>Reduce the dielectric material thickness.<\/li>\n<li>Use adhesiveless base materials, which can reduce the thickness of the substrate by 1-2 mils, which is almost 25-50 \u03bcm.<\/li>\n<li>Make use of selective plating to avoid copper plating the conductors.<\/li>\n<\/ul>\n<\/div>\n<p align=\"justify\"><strong>Improve Reliability by Reinforcing the PCB<\/strong><\/p>\n<p align=\"justify\">Here, the boards, components, and the layout should be designed to deliver a robust structure that can withstand flexing.<\/p>\n<div align=\"justify\">\n<ul>\n<li>The weight on both sides of the PCB should be equal. This includes the weight of the conductors and the material.<\/li>\n<li>The conductors on different layers of a PCB should not be placed on top of each other. Instead they should be placed in a staggered pattern. (Please refer image below)<\/li>\n<li>Conductor thickness should always be constant in and near the bend areas.<\/li>\n<li>There should be no plated-through holes in the bend areas.<\/li>\n<li>For slits in the circuit, reliefs or tear stops need to be built into the PCB.<\/li>\n<li>There should be no discontinuities near the bend.<\/li>\n<li>Traditional copper can prove to reduce the flexibility of a PCB. Opt for screened-on coatings like silver epoxy.<\/li>\n<\/ul>\n<\/div>\n<p align=\"justify\">Tight tolerances will have to be put in place to ensure that your stacked up PCB can provide flexibility as well as reliability. Several of the above-mentioned steps can easily be incorporated in the designing process itself. Your PCB manufacturer should be able to help you with the most appropriate improvements for your application.Visit our website <a href=\"http:\/\/www.rigiflex.com\">www.rigiflex.com<\/a> to know in detail about 8 Layer Stackup Flex.<\/p>\n<p align=\"justify\"><a href=\" https:\/\/www.rigiflex.com\/pcb-quote\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-781 size-full\" src=\" https:\/\/www.rigiflex.com\/blog\/wp-content\/uploads\/2023\/04\/PCB-Online-Quote.png\" alt=\"PCB Online Quote\" width=\"247\" height=\"50\" \/> <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>When designing a flex PCB stackup, the fabricator might face some restrictions in enhancing the reliability of the board. Today, we will discuss ways to improve the reliability of a board by increasing the flexibility and improving design considerations of a multilayer PCB stackup. These steps can be implemented for PCB stackup designs as seen<\/p>\n<p class=\"more-link\"><a href=\"https:\/\/www.rigiflex.com\/blog\/how-to-improve-reliability-flexibility-in-an-8-layer-stackup-flex\/\" class=\"themebutton\">Read More<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[17,16],"class_list":["post-152","post","type-post","status-publish","format-standard","hentry","category-industrial","tag-8-layer-flex-pcb","tag-8-layer-stackup-flex"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Improve Reliability &amp; Flexibility in an 8 Layer Stackup Flex? - Rigiflex Technology Inc. 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