It (NEMA FR-4) consists of a woven glass fabric substrate combined with a halogenated epoxy resin system. It is produced to printed circuit board quality standards, is flame retardant and meets UL-94 flammability classification V-0. NP130 meets or exceeds the requirements of MIL-I-24768/27, Type GEE-F, and IPC 4101, sheet 21.