Vitrite

Vitrite is a very low fusing point black glass mainly used for the insulation base of electric lamps. It used to be made by the Vitrite Company.[1] Vitrite can be called foam glass because the mineral from which it is obtained is a spongy mass varying in colour from white to black depending on impurities.[2]

  1. ^ "'Vitrite' holders for incandescence lamps", Electrical Review, vol. 16, no. 378, p. 165, 21 February 1885.
  2. ^ Official Journal of the European Communities: Information and notices, vol. 41, Issues 287-291, p. 173, Office for Official Publications of the European Communities, 1998