The raw materials used in 8086A/B double-group liquid unfilled epoxy resin are imported Shell bisphenol A resin and methyl hexahydroacid anhydride curing agent, which are processed and reacted by a special process. The product has advanced technological performance and good mechanical, electrical and heat dissipation performance. Applicable to: casting of dry-type transformers, dry-type reactors, special transformers, etc.