Potassium silicate
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| Surname | Potassium silicate | |||||||||
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| Molecular formula | K 2 Si 2 O 5 | |||||||||
| Brief description |
colorless solid |
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| properties | ||||||||||
| Molar mass | 214.36 g mol −1 | |||||||||
| Physical state |
firmly |
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| density |
1.25-1.60 g · cm −3 |
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| Melting point |
905 ° C |
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| solubility |
soluble in water (360 g l −1 at 20 ° C) |
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | ||||||||||
Potassium silicate is a chemical compound from the group of potassium compounds and silicates . It is usually a not exactly stoichiometric substance with the formula K 2 O · n SiO 2 ( i.e. potassium oxide and silicon dioxide ), where n is 0.5 for tetrapotassium orthosilicate and the ratio between 1.5 and 5.0 for commercially available products lies.
Extraction and presentation
Potassium silicate is obtained by melting together quartz sand , potassium carbonate and coal (all finely pulverized). The solid mixture of potassium silicate and silica obtained in this way is often converted into a syrupy solution for further use under pressure with superheated water.
properties
Potassium silicate is a glass-like solid that is soluble in water.
use
Potassium silicate is used as a binding agent and adhesive (for mineral paints and plasters, refractory mortars, building materials) and in so-called plant strengtheners.
See also
Individual evidence
- ↑ a b c d e Entry on potassium silicate in the GESTIS substance database of the IFA , accessed on February 1, 2016 (JavaScript required)
- ↑ a b c OECD : Screening Information Dataset (SIDS) Initial Assessment Report (SIAR) for Potassium Silicate , accessed on November 27, 2019.
- ↑ Kremer Pigments: Potash water glass ( Memento from February 19, 2012 in the Internet Archive )
- ↑ vanbaerle: potassium silicate