![]() ![]() While FR4 is by far the most popular substrate material for single and multilayer PCBs, it has its drawbacks: These PCB laminates comply with the UL94V-0 standard on inflammability of plastic materials. What we call "FR4" is actually a National Electrical Manufacturers Association (NEMA) designation for a class of materials it is not one specific material or even one specific material composition. You Don’t Have to Settle For an FR4 Substrate What's more important is to understand the criteria for selecting an alternative to an FR4 substrate, and I'll provide the criteria that are important for various applications. I'll show some examples in this article, although I'll do my best to be vendor-agnostic. If you need to build a device that is specialized for extreme environments, repeated thermal cycling, or high speed/RF devices, there are alternative materials for multilayer PCB substrates that may be a better choice. Although there are multiple PCB laminate material manufacturers, the broad class of available substrates is somewhat limited. However, you might want to pursue alternative PCB substrate materials for a multilayer board. FR4 substrates are by far the most popular option you'll find from fabricators, and each fabricator has their preferred supplier. Sometimes, it pays to go against the grain.
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