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]
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 manganese oxide to produce a black colour.
References
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companies
- Anchor Hocking
- Arc Holdings
- Ardagh Group
- Asahi
- Aurora Glass Foundry
- Baccarat
- Barovier & Toso
- Berengo Studio
- Blenko Glass
- Bodum
- Bormioli Rocco
- Borosil
- Caithness Glass
- Corning
- Crystalex
- Dartington Crystal
- Daum
- Duralex
- Fanavid
- Fenton Art Glass Company
- Firozabad glass industry
- Franz Mayer
- Fuyao
- Glava
- Glaverbel
- Guardian Industries
- Hadeland
- Hardman & Co.
- Holmegaard Glassworks
- Holophane
- Hoya
- Kingdom of Crystal
- Kokomo Opalescent Glass Works
- Kosta Boda
- Libbey
- Liuli Gongfang
- Iittala
- Luoyang
- Johns Manville
- Mannok
- Mats Jonasson Målerås
- Moser Glass
- Mosser Glass
- Nippon Sheet Glass
- Nižbor glassworks
- O-I Glass
- Ohara
- Orrefors
- Osram
- Owens Corning
- Pauly & C. - Compagnia Venezia Murano
- Phu Phong
- Pilkington
- PPG Industries
- Preciosa
- Riedel
- Rona
- Royal Brierley
- Saint-Gobain
- Saint-Louis
- Seguso
- Schott
- Sterlite Optical Technologies
- Steuben
- Swarovski
- Val Saint Lambert
- Vallérysthal
- Waterford
- Watts & Co.
- World Kitchen
- Xinyi Glass
- Zwiesel
companies
- John Adams
- Richard M. Atwater
- Frederick Carder
- Irving Wightman Colburn
- Henry Crimmel
- Friedrich
- A. H. Heisey
- Deming Jarves
- Edward D. Libbey
- Dante Marioni
- Antonio Neri
- Michael Joseph Owens
- Alastair Pilkington
- Flavio Poli
- Salviati
- Otto Schott
- Henry William Stiegel
- S. Donald Stookey
- Lino Tagliapietra
- W. E. S. Turner
- Tomasz Urbanowicz
- Paolo Venini
- John M. Whitall
- Caspar Wistar
and brands
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