waterglass$551505$ - traduzione in greco
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waterglass$551505$ - traduzione in greco

HYGROSCOPIC CHEMICAL COMPOUND OF VARIABLE NA2O/SIO2 RATIO PRECURSOR OF WATERGLASS
Water glass; Soluble glass; Glass water; E550; Waterglass; Liquid glass; Sodium Silicate; Na2SiO3; Na2O3Si; Silicate soda; Solubla glass
  • World War I poster suggesting the use of waterglass to preserve eggs (lower right).

waterglass      
υδρύαλος, ρευστή ύαλος

Definizione

Water glass
·add. ·- A water gauge for a steam boiler.
II. Water glass ·add. ·- A Clepsydra.
III. Water glass ·- ·see Soluble glass, under Glass.
IV. Water glass ·add. ·- An instrument consisting of an open box or tube with a glass bottom, used for examining objects in the water, as upon the sea bottom in shallow places.

Wikipedia

Sodium silicate

Sodium silicate is a generic name for chemical compounds with the formula Na
2x
Si
y
O
2y+x
or (Na
2
O)
x
·(SiO
2
)
y
, such as sodium metasilicate Na
2
SiO
3
, sodium orthosilicate Na
4
SiO
4
, and sodium pyrosilicate Na
6
Si
2
O
7
. The anions are often polymeric. These compounds are generally colorless transparent solids or white powders, and soluble in water in various amounts.

Sodium silicate is also the technical and common name for a mixture of such compounds, chiefly the metasilicate, also called waterglass, water glass, or liquid glass. The product has a wide variety of uses, including the formulation of cements, passive fire protection, textile and lumber processing, manufacture of refractory ceramics, as adhesives, and in the production of silica gel. The commercial product, available in water solution or in solid form, is often greenish or blue owing to the presence of iron-containing impurities.

In industry, the various grades of sodium silicate are characterized by their SiO2:Na2O weight ratio (which can be converted to molar ratio by multiplication with 1.032). The ratio can vary between 1:2 and 3.75:1. Grades with ratio below 2.85:1 are termed alkaline. Those with a higher SiO2:Na2O ratio are described as neutral.