Vitrite
Vitrite, also known as foam glass, 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.
Process
To make the electric lamp, molten vitrite is poured into the shell up to a height of approximately a quarter inch (6 millimeters). A plunger is brought down to force the plastic glass into shape and fix the contacts.
Composition
Vitrite is referred to as glass but in fact it is an enamel which contains a high proportion of lead (II) oxide to give fluidity, and considerable quantities of manganoc to produce a black colour.
gollark: And rocket launch is probably less safe than just burying it underground forever, there is not actually that much, especially with better reprocessing.
gollark: We have! The issues which happened previously would *not* happen in any recent good plant!
gollark: Yes, people are terrible and unable to comprehend risk sanely.
gollark: And organizations also develop the subgoal of perpetuating themselves over time.
gollark: In theory they do, but apparently public companies think ridiculously short-term in investments.
References
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.