Sodium Silicate
Na2SiO3 Deflocculant, De-flocculant
Chemistry
|
Links to Other Materials
- Darvan - Alternative
- Acumer Dispersant Polymer - Alternative
- Cache
Miscellaneous
- Family: Electrolyte
- Region: None
- Mined At: Unspecified
- Raw Mineral: No
- Generic: No
Notes
The most popular deflocculant used in casting slips for many years. It is nearly always used with soda ash as used alone it makes the slip 'stringy' and thixotropic. The material is effective, reliable and inexpensive. However, it attacks the plaster in molds much more than more modern deflocculants and it is much easier to overdeflocculate a slip with sodium silicate.
There are potassium based deflocculants which are similar to the corresponding sodium ones. They can be employed where the presence of sodium is undesirable. Soda ash is more suitable for deflocculating glazes.
In addition, a wide range of organic deflocculants are available as alkali salts of pyrogallic, humic or tannic acids. They have long working ranges and can increase the apparent plasticity of the clay. Their use prolongs mold life compared with sodium silicate and soda ash. They are less prone of over deflocculation also.
Tetramethylammoniumhydroxide is also an organic compound that is used where residues from inorganic salts cannot be tolerated. It is a strong base that can even attack glass and quartz.
Data
- Melting Point (MP): 1080C M
- Specific Gravity: 2.40
- Specific Gravity: 2.40
- Melting Point (MP): 1080C M
Linked Articles
Understanding the Deflocculation Process in Slip Casting
Understanding the magic of deflocculation and how to measure specific gravity and viscosity, and how to interpret the results of these tests to adjust the slip, these are the key to controlling a casting process.
Suppliers
- Generic
Authors
- Tony Hansen (Owner)
XML
<?xml version="1.0" encoding="UTF-8"?>
<material name="Sodium Silicate" descrip="Na2SiO3 Deflocculant, De-flocculant" generic="0" rawmineral="0" searchkey="" loi="0.00">
<families>
<family name="Electrolyte"/>
</families>
<oxides>
<oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="50.780" tolerance=""/>
<oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="49.220" tolerance=""/>
</oxides>
<references>
<reference name="seealso" reason=""/>
<reference name="seealso" reason=""/>
</references>
<suppliers>
<supplier name="Generic" country="" url="" label=""/>
</suppliers>
<notes>
<note>The most popular deflocculant used in casting slips for many years. It is nearly always used with soda ash as used alone it makes the slip \'stringy\' and thixotropic. The material is effective, reliable and inexpensive. However, it attacks the plaster in molds much more than more modern deflocculants and it is much easier to overdeflocculate a slip with sodium silicate.
There are potassium based deflocculants which are similar to the corresponding sodium ones. They can be employed where the presence of sodium is undesirable. Soda ash is more suitable for deflocculating glazes.
In addition, a wide range of organic deflocculants are available as alkali salts of pyrogallic, humic or tannic acids. They have long working ranges and can increase the apparent plasticity of the clay. Their use prolongs mold life compared with sodium silicate and soda ash. They are less prone of over deflocculation also.
Tetramethylammoniumhydroxide is also an organic compound that is used where residues from inorganic salts cannot be tolerated. It is a strong base that can even attack glass and quartz.</note>
</notes>
<testdata>
<testitem testname="2" value="1080C M"/>
<testitem testname="2" value="2.40"/>
<testitem testname="2" value="2.40"/>
<testitem testname="2" value="1080C M"/>
</testdata>
</material>
Much more information with complete interlinking to many related Copyright 2003 http://digitalfire.com, All Rights Reserved Please support http://ceramicmaterials.info to improve this library |  |
INSIGHT is ceramic chemistry |