Prepreg

The prepreg comprises electronic-grade glass fiber cloth, two sides of the electronic-grade glass fiber cloth are respectively coated with an adhesive layer, and at least one kind of hollow glass beads with the same particle size are uniformly distributed in the adhesive layers. The composite board has the advantages of uniform density and light weight, the density of the composite board is obviously reduced, and the density of each part is uniform, so that the weight of the board is reduced, and the light weight requirement can be met. 一种半固化片，包括电子级玻璃纤维布，所述电子级玻璃纤维布的双面各覆有胶层，所述的胶层内均匀分布有至少一种相同粒径的空心玻璃微珠。本实用新型具有密度均匀、轻量化的优点，明显降低复合板材密度且各部位密度均匀，从而降低板材质量，可以满足轻量化的要求。