PEI Fibertek B-stage surge rope is preferred by industry leaders not only because of it's superior performance qualities, but is the choice of those who work with it everyday because of it's application flexibility and equally important soft polyester finish that protects their hands from glass fibers and raw resins. PEI Fibertek B-stage surge rope provides greater protection for your work and workers. - PEI Fibertek surge rope is constructed using a core of glass yarns which have been impregnated with a thermosetting modified polyester resin system rated at Class H Plus/220 °C. The B-Stage core is overbraided with a spun polyester fiber encapsulating the core. It is designed for surge ring and other structural applications requiring a rigid insulating and high mechanical strength material.