| Popis: |
The utility of ethyl cellulose films and plastics for electrical insulation depends upon a combination of properties which is unusual among cellulose derivatives. Ethyl cellulose films and plastics are mechanically strong and tough, have good dimensional stability, low moisture absorption, and good resistance to heat, light, and the action of water at ordinary temperatures. The dielectric properties of ethyl cellulose films vary more with the severity of their exposure to water than to any other condition tested, but are retained to a greater extent than those of other commercially available sheetings. Ethyl cellulose injection‐molded plastics have practically the same dielectric constant as the unplasticized film but have a higher power factor due to the presence of plasticizer. The dielectric properties of ethyl cellulose plastics are retained with very little change on exposure to temperatures up to 40° C. and on immersion in water at ordinary temperatures. |
