Re: Lead and Wood
Marco,
I believe that in the major industrial city of Milano, you can surely
fine sodium silicate. Forget about asking the farmer how he preserved
eggs. Instead, find a company that sells chemicals to schools for use
in the science laboratory, or go to a supplier of materials for
foundries where metal castings are made. Below is some information from
a Web search that might help you.
Vince Chew
Synonyms: Water glass; Soluble glass; Silicate of soda; Sodium
Orthosilicate; Silicic Acid Sodium Salt; Sodium silicate glass
the chemical formula is: Na4 O4 Si
Description:
Sodium Silicate is a liquid material that can be mixed with sand to form
a core binder. The cores will harden when gassed with CO2 (Carbon
Dioxide). This material is also commonly called Water Glass.
What It Does:
Cores are used to create hollow cavities in the interior of castings.
In the sand cast process, sand is mixed with a binder to form a core
that is strong
enough to withstand the pressure of the molten metal. The core must be
porous to allow gas to escape from the casting. It should also be
easily removed
from the finished casting. Sodium Silicate is used as the binder that
holds the sand together in cores.
I believe that in the major industrial city of Milano, you can surely
fine sodium silicate. Forget about asking the farmer how he preserved
eggs. Instead, find a company that sells chemicals to schools for use
in the science laboratory, or go to a supplier of materials for
foundries where metal castings are made. Below is some information from
a Web search that might help you.
Vince Chew
Synonyms: Water glass; Soluble glass; Silicate of soda; Sodium
Orthosilicate; Silicic Acid Sodium Salt; Sodium silicate glass
the chemical formula is: Na4 O4 Si
Description:
Sodium Silicate is a liquid material that can be mixed with sand to form
a core binder. The cores will harden when gassed with CO2 (Carbon
Dioxide). This material is also commonly called Water Glass.
What It Does:
Cores are used to create hollow cavities in the interior of castings.
In the sand cast process, sand is mixed with a binder to form a core
that is strong
enough to withstand the pressure of the molten metal. The core must be
porous to allow gas to escape from the casting. It should also be
easily removed
from the finished casting. Sodium Silicate is used as the binder that
holds the sand together in cores.