... protective glass, the right and left eyepiece tube of optical instruments. Also, it is used as the transparent ... Also, it is used to make fine parts of communication equipment, such as CD-ROM, telephone, computer, video recorder ... , recorder, color video tape. Etc 3. Machinery and equipment-PC is suitable for gear, rack, worm, bearings, ... tableware, toys and models. Polycarbonate PC Optical Grade