What is Glass? Part 5 | Back Painted Glass

There are other special types of glass and back painted glass by adding different substances. For example:

Element Properties
Alumina It improves chemical resistance and increases viscosity in lower temperature ranges
Cerium To absorb infrared rays
Coloring agents Metals and metal oxides to change color (ex. manganese and selenium to decolorized gas, cobalt for blue, copper for red, nickel produces blue, violet or black glass, titanium produces yellowish-brown, etc.).
Barium oxide Glass containing barium is not quite as heavy as lead crystal, but achieves similar brilliance due to its high refractive index.
Fluorine Fluorine-containing materials, such as fluorspar (CaF2) or phosphates to form small crystalline particles in the glass which gives them a cloudy and opaque impression
Recently developed forms of glass include:Safety glass, constructed of two pieces of plate glass join by a plastic to prevent the glass from scattering when broken.

Fiberglass made from molten glass formed into continuous filaments that is used for fabrics or electrical insulation

Foam glass made by trapping gas bubbles in glass to produce a spongy material for insulating purposes.

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