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: Because JS is easy and some people are used to it.
gollark: Well, there are many bad ones. Like PHP.
gollark: > [...] PHP> best 4 languagesThis is extremely heretical.
gollark: I've got a reasonably okay 1080p monitor I don't use at all for some mysterious reason.
gollark: I really should actually learn to solder one of these nanomillenia.
References
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.