| 摘要 |
A varnish includes an epoxy resin, a curing agent, an accelerator agent and fillers. The fillers include sericite powders. The sericite powders have composition of SiO2 in weight ratio of 55±3%. Furthermore, the Mohs' scale of hardness of the sericite powder is between 2 to 3. Glass fabric cloth is dipped into the varnish so as to form a prepreg with better machined-work capability.
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