FAQ: What are the main differences between epoxy and phenolic RTRC conduits?
The main difference is fire resistance. Epoxy RTRC conduit has an operating range of -60°F to 250°F whereas phenolic (Flame Shield®) RTRC can be exposed to temperatures up to 1,850°F for two (2) hours. Phenolic conduit also meets the elevated temperatures requirements for exposed conduits of both the National Fire Protection Association (NFPA 130) and the American Society for Testing and Materials (ASTM E136). This allows Flame Shield® to be in compliance when surface mounted. Epoxy fiberglass conduit is in compliance only when encased in concrete. In addition, Flame Shield® has met the increased temperature and duration demands of the National Fire Protection Association (NFPA 502).