Epoxy resin has good mechanical, electrical, adhesion, chemical stability and other properties, to the adhesives, electrical insulating materials and composite materials has important applications. However, the epoxy curing the biggest weakness is the brittleness, the traditional strength of the material toughness of the methods for improved several times, but inevitably other properties of the material decreased. The high purity spherical silica powder added to the epoxy resin, the experimental results show that: the right amount of high purity spherical silica powder can make the impact strength of composites, the elongation rate has greatly improved, while improving the heat resistance of the material .
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