Curiosities about glass | The history of glass   
   








In its purest form, glass is transparent, relatively strong, resilient, essentially inert and biologically inactive and can be formed with very flat surfaces and waterproof.

Even today, after centuries of research, scholars differ as to the true physical structure of the glass. Is it solid or liquid?

The ordinary person is still questioning as a material can be at the same time, as hard as fragile as firm as flexible and as simple as beautiful.

The glass is present in our day to day and often do not realize. He is unique in nature, allows you to see without being seen, it is magic, is a matter while invisible.

The glass is still saving the ancient mysteries, where the production has much of the old alchemical process.


COMPOSITION OF GLASS:

Silica - SiO2 - Basic - vitrificante.
Soda - Na2O - lowers the melting point of silica.
Calcium - CaO - stability of the glass.
Magnesium - MgO - enhances the mechanical strength of glass.
Alumina - Al2O3 - strengthens the resistance of the glass.
Sodium chloride, sodium nitrate, selenium oxide - fining.
Arsenic oxide (BLUE), Iron Oxide (GREEN), Selenium oxide (GREY) - colors.
Scrap glass - 20% to 40% for fusion.


MANUFACTURING PROCESS:

Glass is an inorganic substance, homogeneous and amorphous. By the time 800 ° C, the mixture that makes up the glass, reaches a thick paste and when it reaches 1000 ° C, enters the melting point.

Currently, there are four manufacturing processes, Fourcoult, Pittsburgh, Libbey Owens and Float Glass. The latter is the more usual, since it has no distortion or ripples.


CLASSIFICATION OF GLASS:

-TEMPERED
It is a common glass that goes through a tempering process, laying stress on high surface areas and corresponding high voltage in the center, (externally and internally in compression and growing). This process gives you a much higher resistance to shock. Once hardened, does not allow new processes of cuts, holes or cutouts.

Tempering process:
Before you start the tempering process, glass is properly prepared, with the cuts, holes and sizes required. Then the glass passes through quality control, in order to find possible defects. Already at the stage of tempering the glass is heated to a temperature of about 600 ° C and then immediately undergoes a sudden cooling. This process creates the stress on the glass.

Tempered glass Features:
This glass is considered a safety glass, since it is not estilhaçavel.
In case of breaking the glass is divided into granular fragments, showing no sharp angles.
The resistance of this glass is five times higher than ordinary glass of equal thickness. It is resistant to thermal shock, mechanical, bending and twisting. However, its handling must be done carefully, avoiding the impacts of solid glass, since you may withdraw part of their resistance.

- LAMINATED
In this process, through methods of bonding, are interspersed with one or more glasses butyral PVB. With this process the glass gets a high impact resistance. In case of breakage, the glass keeps in place.

- Aramis
Glass with a metal grid inside. Before the fusion process is a metal mesh placed on the glass.

VISUAL APPEARANCE OF GLASS:
Transparent
Translucent
Opaque

COLORS OF GLASS:
Colorless
Smoked
Bronze
Green

USE OF DIFFERENT TYPES OF GLASS:

Hollow glass bottles, jars, etc..
Flat glass, furniture, windows, storefronts, cars, etc..
Thin glass, lamps, electronics, test tubes, etc..
Curved glass: hotels, aquariums, cars, construction, etc..

NOISE LEVEL REDUCTION FOR EACH THICKNESS:

. 3 mm equal to 27 db
. 4 mm equal to 28 db
. 5 mm equal to 29 db
. 6 mm equal to 30 db
. 8 mm equal to 31 db
. 10 mm equal to 31 db
. 12 mm equal to 32 db
 
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