material. That is to say, crack initiation life ratio of halogen free materials were 70～75%, and it of halogen materials were 80～90%. Difference of destruction unit area in fracture surface of resin Fig.6 (a) and (b) shows fracture surface photographs of halogen free material and halogen material by scanning electron microscope (SEM) at low magnification. In addition, fracture surface photographs at a high magnification are shown in order to compare the difference of fracture morphology of matrix resin of both materials. Examination of fracture surface by SEM revealed that a fracture surface of halogen free material differed from that of halogen material. It was proven that the fracture surface of matrix resin of halogen free materials have been formed in granular form, and a size of that grain was about 4 μm diameters, and the resin comparatively adheres to glass fibers from Fig.7 (a). In the meantime, it was proven that the fracture surface of matrix resin of halogen materials have been formed in the shell state form of about 100～200 μm diameters, and the resin does not adhere to glass fiber shown in Fig.7 (b). In 200μm 200μｍ (a) Halogen-free material（×100） (b) Halogen material（×100） Fig.6 Fracture surface of halogen-free material by using SEM 10μm 50μm (a)Halogen-free material（×2000） (b)Halogen material（×500） Fig.7 Difference of the pattern of fracture of resin in halogen-free and halogen mater (a)Halogen-free material (b)Halogen material Fig.8 Schematic of fatigue fracture mechanism of halogen-free and halogen material
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