Component A: 2-10 parts of a phosphorus-containing anhydride, Component B: 5-40 parts of a phosphorus-free anhydride, Component C: 5-45 parts of an epoxy resin, Component D: 40-70 parts of a filler, and Component E: 0-15 parts of a phosphorus-containing flame retardant;

the total part by weight of the Component A, Component B, Component C, Component D and Component E is 100 parts;

the phosphorus-containing anhydride has a structure represented by Formula I or Formula II as follows:

wherein R¹ and R₂ are each independently selected from any one of hydrogen, C1-C5 alkyl, substituted phenyl, unsubstituted phenyl, substituted naphthyl, and unsubstituted naphthyl;

R₃ is selected from any one of hydrogen, C1-C5 alkyl, siloxy and siloxyalkyl;

X₁ and X₂ are each independently selected from any one of

wherein * represents a linkage site of the group;

R₁₁ and R₁₂ are each independently selected from any one of C1-C5 alkyl, benzoxazinyl, substituted phenyl, unsubstituted phenyl, substituted naphthyl, and unsubstituted naphthyl;

when the above group contains a substituent, the substituent is a halogen atom or a C1-C5 linear or branched alkyl group;

wherein the epoxy resin is selected from a bisphenol A epoxy resin, a bisphenol F epoxy resin, a biphenyl epoxy resin, and combinations thereof;

wherein the epoxy resin of Component C is the only epoxy resin present in the composition; and

wherein the filler is titanium dioxide.