Difference between revisions of "sodium silicate"
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; cement floor sealer: 1:4 by weight | ; cement floor sealer: 1:4 by weight | ||
| − | Dry sodium silicate does not readily dissolve in water. Heating the water | + | |
| + | == dissolving sodium silicate in water == | ||
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| + | Dry sodium silicate does not readily dissolve in water. Heating the water will allow the sodium silicate to dissolve much more quickly. | ||
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| + | Note that I read that at a certain temperature the sodium silicate may become reactive and convert to some other chemical. I'm not sure what this means. I may have misread the source, which I have lost. I need to research this more. | ||
== refractory cement == | == refractory cement == | ||
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A higher silicate:alkali ratio gives faster setting time, while lower ratios give greater strength in the finished product. | A higher silicate:alkali ratio gives faster setting time, while lower ratios give greater strength in the finished product. | ||
| − | An aqueous solution of sodium silicate and vermiculite or perlite can be combined to form a cement or casting material that will withstand the temperatures of a kiln. The sodium silicate forms a fireproof cement; however, it needs a curing or setting agent to harden the sodium silicate | + | An aqueous solution of sodium silicate and vermiculite or perlite can be combined to form a cement or casting material that will withstand the temperatures of a kiln. The sodium silicate forms a fireproof cement; however, it needs a curing or setting agent to harden the sodium silicate. |
;Gas:Carbon dioxide | ;Gas:Carbon dioxide | ||
;Liquid: Glycerol Diacetate plus either Glycerol Triacetate or Ethylene Glycol Diacetate | ;Liquid: Glycerol Diacetate plus either Glycerol Triacetate or Ethylene Glycol Diacetate | ||
| − | ;Solids: Calcium silicates (Portland cement), Calcium Sulphate (gypsum), Silicides such as Ferrosilicon or Calcium Silicide, Silicofluorides or fluorosilicates, heavy metal salts such as carbonates or phosphates. | + | ;Solids: Calcium silicates (Portland cement), Calcium Sulphate (gypsum), Silicides such as Ferrosilicon or Calcium Silicide, Silicofluorides or fluorosilicates, heavy metal salts such as carbonates or phosphates, other sources of multivalent metal cations such as Ca<sup>+2</sup>, Mg<sup>+2</sup>, Zn<sup>+2</sup>, Cu<sup>+2</sup>, Fe<sup>+3</sup>. |
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| + | Note that ordinary portland cement provides Calcium ions which will almost instantly set Sodium Silicate. Adding a small amount of cement or plaster to an aggregate mix of Sodium Silicate and vermiculite will cause the mixture to set in just a few minutes. | ||
== Sources == | == Sources == | ||
Common '''TSP substitute''' is often Sodium Metasilicate. This is available in any hardware store. | Common '''TSP substitute''' is often Sodium Metasilicate. This is available in any hardware store. | ||
Latest revision as of 03:22, 12 November 2014
sodium silicate, sodium metasilicate, water glass, liquid glass, Na2SiO35H2O, or, more correctly, Na2SiO2(OH)2·4H2O
Contents
glossary
- OPC
- Ordinary Portland cement
concentrations of sodium silicate to water for various applications
Na2SiO3
sodium silicate pentahydrate, Na2SiO3·5H2O, is the common commercial variant most often seen. Note that the dried prills without packing are nearly the same density as water, so it's a good rough approximation to measure by volume.
- chemical gardens
- 3:2 (by weight sodium silicate:water)
- refractory cement
- 1:1 by weight
- casting
- 1:1 by weight
- cement floor sealer
- 1:4 by weight
dissolving sodium silicate in water
Dry sodium silicate does not readily dissolve in water. Heating the water will allow the sodium silicate to dissolve much more quickly.
Note that I read that at a certain temperature the sodium silicate may become reactive and convert to some other chemical. I'm not sure what this means. I may have misread the source, which I have lost. I need to research this more.
refractory cement
Potassium silicate and Calcium silicate may also be used instead of sodium silicate. A higher silicate:alkali ratio gives faster setting time, while lower ratios give greater strength in the finished product.
An aqueous solution of sodium silicate and vermiculite or perlite can be combined to form a cement or casting material that will withstand the temperatures of a kiln. The sodium silicate forms a fireproof cement; however, it needs a curing or setting agent to harden the sodium silicate.
- Gas
- Carbon dioxide
- Liquid
- Glycerol Diacetate plus either Glycerol Triacetate or Ethylene Glycol Diacetate
- Solids
- Calcium silicates (Portland cement), Calcium Sulphate (gypsum), Silicides such as Ferrosilicon or Calcium Silicide, Silicofluorides or fluorosilicates, heavy metal salts such as carbonates or phosphates, other sources of multivalent metal cations such as Ca+2, Mg+2, Zn+2, Cu+2, Fe+3.
Note that ordinary portland cement provides Calcium ions which will almost instantly set Sodium Silicate. Adding a small amount of cement or plaster to an aggregate mix of Sodium Silicate and vermiculite will cause the mixture to set in just a few minutes.
Sources
Common TSP substitute is often Sodium Metasilicate. This is available in any hardware store.
