impreg

Early electrical workers used it as a coating to insulate coils, and molded it into stand-alone insulators by pressing together layers of shellac-impreg-nated paper.

早期的人将它用作涂料，隔离缠绕在一起的线圈，还将注满了紫胶的纸一地压紧制成单独的绝缘物。