Patent ID: 11718729

Abstract:
An insulating filler composed of a mixed powder in which a hydrophobic fumed oxide powder having an average primary particle size D1, which is smaller than an average primary particle size D2, is adhered to the surface of a magnesium oxide powder and/or a nitride-based inorganic powder having the average primary particle size D2, wherein: the ratio D1/D2 of the average primary particle size D1 to the average primary particle size D2 is 6×10−5 to 3×10−3; the volume resistivity of the mixed powder is 1×1011 Ω·m or more; and the content ratio of the hydrophobic fumed oxide powder in the mixed powder is 5-30 mass %. Also provided is an insulating material in which the above-mentioned insulating filler is contained in a resin molded body.