--- title: Epec's Blog | Flex & Rigid-Flex PCB's (5) description: Flex & Rigid-Flex PCB's | A manufacturing blog focusing on posts about customized product solutions that are beneficial to engineers or anyone in the electronics industry. 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[Register](https://secure.epecpcb.com/epec/index2.jsp) [![](https://www.epectec.com/images/InstantPCBQuote-logo.png)](https://www.epectec.com/instantpcbquote/) [Login](https://secure.epecpcb.com/epec/) [Register](https://secure.epecpcb.com/epec/index2.jsp) Register to Quote and Order Your PCBs Fast, Easy & Online, 24/7 - [Home](https://www.epectec.com/) - [Blog](https://blog.epectec.com/) Share This Page: [LinkedIn](https://blog.epectec.com/#linkedin) [X](https://blog.epectec.com/#x) [Facebook](https://blog.epectec.com/#facebook) [Email](https://blog.epectec.com/#email) # Epec's Blog | Electronics Manufacturing Solutions --- ## [Electrical vs Mechanical Requirements in Flexible PCB Designs - Q&A](https://blog.epectec.com/electrical-vs-mechanical-requirements-in-flexible-pcb-designs-q-and-a) [![Electrical vs Mechanical Requirements in Flex & Rigid-Flex PCB Designs](https://blog.epectec.com/hubfs/Imported%20sitepage%20images/electrical-vs-mechanical-design-requirements-in-flex-and-rigid-flex-circuit-designs.jpg "Electrical vs Mechanical Requirements in Flex & Rigid-Flex PCB Designs")](https://blog.epectec.com/electrical-vs-mechanical-requirements-in-flexible-pcb-designs-q-and-a) Written by [Epec Engineered Technologies](https://blog.epectec.com/author/epec-engineered-technologies) Posted on November 21, 2022 at 4:02 PM - [Tweet](https://twitter.com/share) At the conclusion of our webinar, [Electrical vs Mechanical Requirements in Flex & Rigid-Flex PCB Designs](https://www.epectec.com/webinar/11-18-2022/electrical-vs-mechanical-requirements-in-flex-and-rigid-flex-pcb-designs.html), we had several questions submitted to our presenter, Paul Tome, Product Manager Flex and Rigid-Flex, at Epec. We have compiled these questions into a readable format on our blog. [Read More](https://blog.epectec.com/electrical-vs-mechanical-requirements-in-flexible-pcb-designs-q-and-a) --- ## [Differences Between FR4 and Polyimide Materials In Flex Circuits](https://blog.epectec.com/differences-between-fr4-and-polyimide-materials-in-flex-circuits) [![Polyimide flex circuit material cross-section](https://blog.epectec.com/hubfs/blog/polyimide-flex-circuit-material-cross-section.jpg "Polyimide flex circuit material cross-section")](https://blog.epectec.com/differences-between-fr4-and-polyimide-materials-in-flex-circuits) Written by [Paul Tome](https://blog.epectec.com/author/paul-tome) Posted on November 8, 2022 at 9:08 AM - [Tweet](https://twitter.com/share) Design teams transitioning from [rigid PCB](https://www.epectec.com/pcb/) technology to [flexible circuits](https://www.epectec.com/flex/) often assume that the primary difference between FR4 and polyimide is flexibility. While flexibility is the most visible distinction, these materials also differ significantly in construction, thickness options, copper types, thermal performance, moisture behavior, and electrical properties. [Read More](https://blog.epectec.com/differences-between-fr4-and-polyimide-materials-in-flex-circuits) --- ## [Why HASL Surface Finish for Flexible Circuit Boards Is Not Recommended](https://blog.epectec.com/why-hasl-surface-finish-for-flexible-circuit-boards-is-not-recommended) [![Fine pitch SMT with HASL surface finish.](https://blog.epectec.com/hubfs/blog/fine-pitch-smt-with-hasl-surface-finish.jpg "Fine pitch SMT with HASL surface finish.")](https://blog.epectec.com/why-hasl-surface-finish-for-flexible-circuit-boards-is-not-recommended) Written by [Paul Tome](https://blog.epectec.com/author/paul-tome) Posted on October 26, 2022 at 8:48 AM - [Tweet](https://twitter.com/share) [Flexible circuit boards](https://www.epectec.com/flex/) often require surface finishes that support fine-pitch components, reliable interconnects, and demanding manufacturing requirements. While hot air solder leveling (HASL) was once widely used throughout the electronics industry, it is now rarely selected for flexible circuit designs. [Read More](https://blog.epectec.com/why-hasl-surface-finish-for-flexible-circuit-boards-is-not-recommended) --- ## [Flexible Circuit Boards with Lap Joints: Design Considerations](https://blog.epectec.com/flexible-circuit-boards-with-lap-joints-design-considerations) [![2 layer lap joint flex circuit stackup](https://blog.epectec.com/hubfs/blog/2-layer-lap-joint-flex-circuit-stackup.jpg "2 layer lap joint flex circuit stackup")](https://blog.epectec.com/flexible-circuit-boards-with-lap-joints-design-considerations) Written by [Paul Tome](https://blog.epectec.com/author/paul-tome) Posted on October 18, 2022 at 8:51 AM - [Tweet](https://twitter.com/share) [Flex circuits](https://www.epectec.com/flex/) have many unique capabilities to solve design challenges. One of these is a lap joint capability that allows a flexible circuit board to be directly attached to another circuit or component eliminating the need for any type of connector. [Read More](https://blog.epectec.com/flexible-circuit-boards-with-lap-joints-design-considerations) --- ## [How to Avoid Fracturing Traces in a Flexible PCB Design](https://blog.epectec.com/how-to-avoid-fracturing-traces-in-a-flexible-pcb-design) [![4 layer rigid flex pcb with epoxy strain reliefs](https://blog.epectec.com/hubfs/blog/4-layer-rigid-flex-pcb-with-epoxy-strain-reliefs.jpg "4 layer rigid flex pcb with epoxy strain reliefs")](https://blog.epectec.com/how-to-avoid-fracturing-traces-in-a-flexible-pcb-design) Written by [Paul Tome](https://blog.epectec.com/author/paul-tome) Posted on October 6, 2022 at 8:19 AM - [Tweet](https://twitter.com/share) [Flexible circuits](https://www.epectec.com/flex/) can withstand significant bending when designed and handled within their intended limits, but they are not immune to mechanical failure. When a flex circuit is bent or handled beyond the capabilities of its materials, trace fractures and cracked circuits can occur. [Read More](https://blog.epectec.com/how-to-avoid-fracturing-traces-in-a-flexible-pcb-design) --- ## [Why Heat Dissipation is Important in Flexible Circuit Board Design](https://blog.epectec.com/why-heat-dissipation-is-important-in-flexible-circuit-board-design) [![Multilayer flex circuit with solid copper planes for heat dissipation.](https://blog.epectec.com/hubfs/blog/multilayer-flex-circuit-with-solid-copper-planes-for-heat-dissipation..jpg "Multilayer flex circuit with solid copper planes for heat dissipation.")](https://blog.epectec.com/why-heat-dissipation-is-important-in-flexible-circuit-board-design) Written by [Paul Tome](https://blog.epectec.com/author/paul-tome) Posted on September 6, 2022 at 8:23 AM - [Tweet](https://twitter.com/share) Heat dissipation is the ability of a part, whether a circuit or any other component, to take the heat that's being generated by a component or an element of the design and to distribute it, dissipate it, and make the heat go away, for lack of a better phrase. This prevents the temperature of the part from continuing to elevate as the device is operated. [Read More](https://blog.epectec.com/why-heat-dissipation-is-important-in-flexible-circuit-board-design) --- ## [Flex PCB Design Options: PCB Pattern Plating vs. Pad Plating](https://blog.epectec.com/flex-pcb-design-options-pcb-pattern-plating-vs-pad-plating) [![Pad Plating Cross Section](https://blog.epectec.com/hubfs/pad-plating-cross-section.jpg "Pad Plating Cross Section")](https://blog.epectec.com/flex-pcb-design-options-pcb-pattern-plating-vs-pad-plating) Written by [Paul Tome](https://blog.epectec.com/author/paul-tome) Posted on May 11, 2022 at 9:21 AM - [Tweet](https://twitter.com/share) Flexibility is a critical element in most [flexible circuit board designs](https://www.epectec.com/flex/). Whether it’s to meet a tight “one-time bend-to-fit” application or a “dynamic” infinite bend cycle application. To meet these requirements, a flex circuit design must be kept as thin as practically possible, use the correct copper type, and utilize the correct copper plating process. [Read More](https://blog.epectec.com/flex-pcb-design-options-pcb-pattern-plating-vs-pad-plating) --- ## [Flexible Epoxy Strain Reliefs in Rigid-Flex PCB Designs](https://blog.epectec.com/flexible-epoxy-strain-reliefs-in-rigid-flex-pcb-designs) [![Flexible Epoxy Strain Reliefs in Flex and Rigid Flex Designs](https://blog.epectec.com/hubfs/flexible-epoxy-strain-reliefs-in-flex-and-rigid-flex-designs.jpg "Flexible Epoxy Strain Reliefs in Flex and Rigid Flex Designs")](https://blog.epectec.com/flexible-epoxy-strain-reliefs-in-rigid-flex-pcb-designs) Written by [Paul Tome](https://blog.epectec.com/author/paul-tome) Posted on March 9, 2022 at 9:22 AM - [Tweet](https://twitter.com/share) Mechanical bend reliability is a critical element in a successful [flex or rigid-flex PCB](https://www.epectec.com/flex/) design. One area that can have a significant impact is the transition line(s) that occurs from a rigid area, in a rigid-flex circuit design, or from a stiffened area, in a flex circuit with stiffeners design, to the flex layer(s) only areas. [Read More](https://blog.epectec.com/flexible-epoxy-strain-reliefs-in-rigid-flex-pcb-designs) --- ## [Flex Circuit Board Design Considerations for Dome Switch Applications](https://blog.epectec.com/flex-circuit-board-design-considerations-for-dome-switch-applications) [![Flexible PCB designed for a user interface using domed switches](https://blog.epectec.com/hubfs/blog/user-interface-with-dome-switches-on-flexible-pcb.jpg "Flexible PCB designed for a user interface using domed switches")](https://blog.epectec.com/flex-circuit-board-design-considerations-for-dome-switch-applications) Written by [Paul Tome](https://blog.epectec.com/author/paul-tome) Posted on October 28, 2021 at 9:13 AM - [Tweet](https://twitter.com/share) Dome switches are a very popular solution for use as a momentary switch. They are a good solution that provides tactile feedback that the switch has been depressed and an event registered. Many applications require a dome switch mounted to a [flexible circuit board](https://www.epectec.com/flex/). [Read More](https://blog.epectec.com/flex-circuit-board-design-considerations-for-dome-switch-applications) --- ## [Converting a PCB and Wire Harness to Integrated Rigid-Flex PCB Design](https://blog.epectec.com/converting-a-pcb-and-wire-harness-to-integrated-rigid-flex-pcb-design) [![Example of a rigid-flex printed circuit board](https://blog.epectec.com/hubfs/blog/rigid-flex-printed-circuit-board-example.jpg "Example of a rigid-flex printed circuit board")](https://blog.epectec.com/converting-a-pcb-and-wire-harness-to-integrated-rigid-flex-pcb-design) Written by [Paul Tome](https://blog.epectec.com/author/paul-tome) Posted on September 28, 2021 at 9:58 AM - [Tweet](https://twitter.com/share) We get many inquiries from our customer base regarding updating or converting an existing design from its current configuration of [rigid printed circuit boards](https://www.epectec.com/pcb/) interconnected with a [wiring harness](https://www.epectec.com/cable-assemblies/wire-harnesses.html) to a [rigid-flex printed circuit board](https://www.epectec.com/flex/). With our experience, we can quickly determine if a conversion option is worth investigating further. We can also see how some are relatively obvious that they would need a complete redesign to convert. [Read More](https://blog.epectec.com/converting-a-pcb-and-wire-harness-to-integrated-rigid-flex-pcb-design) [Previous](https://blog.epectec.com/topic/flex-rigid-flex-pcbs/page/4) | [All posts](https://blog.epectec.com/all) | [Next](https://blog.epectec.com/topic/flex-rigid-flex-pcbs/page/6) --- ### Recent Posts --- ### Posts by Topic - [Printed Circuit Boards (161)](https://blog.epectec.com/topic/printed-circuit-boards) - [Product Design (138)](https://blog.epectec.com/topic/product-design) - [Battery Packs (121)](https://blog.epectec.com/topic/battery-packs) - [Cable Assemblies (102)](https://blog.epectec.com/topic/cable-assemblies) - [Flex & Rigid-Flex PCB's (95)](https://blog.epectec.com/topic/flex-rigid-flex-pcbs) - [Electronics Industry (61)](https://blog.epectec.com/topic/electronics-industry) - [User Interfaces (55)](https://blog.epectec.com/topic/user-interfaces) - [Quality Solutions (33)](https://blog.epectec.com/topic/quality-solutions) - [Flexible Heaters (30)](https://blog.epectec.com/topic/flexible-heaters) - [Events, Training, and Support (9)](https://blog.epectec.com/topic/events-training-and-support) - [RF Products (7)](https://blog.epectec.com/topic/rf-products) - [CNC Machining (3)](https://blog.epectec.com/topic/cnc-machining) - [Fans & Motors (1)](https://blog.epectec.com/topic/fans-motors) See All --- --- ### Need Help with A Project? 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