It (NEMA CEM-1) is a sheet composite material composed of an epoxy resin system, combined with woven glass fabric surfaces and paper core. Initially designed as a low-cost alternative to NEMA Grade FR-4 products, NP424 offers easy punching, excellent mechanical and electrical properties, and higher flexural strength than paper-based grades. NP424 is mainly used in the printed circuit board industry, but can be used for any application that requires higher performance than a phenolic paper-based product. It offers higher strength, better moisture absorption, and better electrical properties than all of the paper and canvas phenolic systems. NP424 complies with the requirements of MIL-I-24768/29, Type CEM-1.