If you buy sodium silicate and start boiling it in a SS pot, you can keep adding citric acid powder till you start seeing the small drops of silica precipitating out of the solution, you need to stop adding acid as soon as you see first sign of it. Now you've colloidal silica which is used as a binder in refractory industry. Also if you mix baking soda and vinegar in a jar it will produce CO2 which can be used to cure a core in a second jar connected with a vinil tube.
After Curing with CO2 you get basically Silica Gel and Sodium Carbonate. The Silica Gel is SiO2 with lots of Hydroxide (OH) and water on its surface. by heating it you drive the water & Hydroxide away hence convert all Si-OH-Si bonds to Si-O-Si bonds which are responsible for the much harder material you are left with
If you want to get cheap source of easily dissolvable silica, you can get it from rice husk ash, it contains 90% fine silica powder. Or you can use rice husk as your furnace fuel.
"Taken from wikipedia" Refractory use Water glass is a useful binder of solids, such as vermiculite and perlite. When blended with the aforementioned lightweight aggregates, water glass can be used to make hard, high-temperature insulation boards used for refractories, passive fire protection and high temperature insulations, such as moulded pipe insulation applications. When mixed with finely divided mineral powders, such as vermiculite dust (which is common scrap from the exfoliation process), one can produce high temperature adhesives. The intumescence disappears in the presence of finely divided mineral dust, whereby the waterglass becomes a mere matrix. Waterglass is inexpensive and abundantly available, which makes its use popular in many refractory applications. Also "Liquid glass" (sodium silicate) is added to the system through the radiator, and allowed to circulate. Sodium silicate is suspended in the coolant until it reaches the cylinder head. At 100-105 °C (212-221 °F), sodium silicate loses water molecules to form a glass seal with a remelt temperature above 810 °C (1,490 °F). So from what they say the waterglass will remelt at temps over 810 °C (aluminium lead and zinc should be ok for molds?).
Hello, i make my own water glass. Recipe is 500 ml distilled water, 200 grams ( by weight ) sodium hydroxide and 300 grams ( by weight ) cat crystals. It comes out very well. I use it when making melting furnaces to glue the kaowool to the lid of the furnace and sometimes on the sides of the furnace. However, i have found through many recipes that its used in NOT to use it for high temperature refractory, it will fail. When achieving temps for melting brass and copper, the water glass will melt when exceeding 1900’f. I had a lid to a furnace which i used sand, water glass and perlite mixture and it completely melted into the crucible. It is not good for high temp refractory diy mixes. The water glass recipe above i have made about 4 batches and store it in a 1500 ml jug. It never hardens in the jug. It the mix/recipe is not right it will harden within days of being in a jug. I have experienced that also when i converted grams to ounces like a ding bat instead of weighing grams by weight. The mix hardened within days. Hope this helps. And do not use tap water or any other water but distilled. It has to be able to absorb all contents used. Hope this helps some.
Also firing the water glass helps cure it fast. Not direct flame hitting it but high temp will cure it faster and rock hard. Putting it in oven to help harden it some is a start but then fire curing it harden/cures it completely.
@@backporchfoundryandforgeus900 for example I'm making a forge hoping to use water glass over ceramic fibre insulation, would you glue the blanket in eith the eater glass then light a fire inside the forge to cure it?
My understanding is in itself its not a refractory material. The sand wont help in this. I plan on experimenting with this stuff but will add a refractory material like silicone carbide or aluminum oxide. Both of which are reasonably cheap as blasting media or rock tumbler grit
Guys if you have any feedback regarding water glass , please drop us a line in the comments , alot of viewers read the comments looking for that cat that really knows the down low .
Did you cure it in a CO2 bath or blast it with CO2? That's what turns it into a high temperature cement. I saw someone, probably luckygen, use sand, molasses and probably water glass to make a core. (4 year old video) Mixing a bit of charcoal into the sand should also harden the mix up in a hour.
I have a couple of questions. What recipe for the water glass would you use to make your own firebrick (to be used inside a BBQ smoker fire box) and do you have a good recipe for making fire brick? Thank you!
It is hard to tell what the concentration of Silica DiOxide, Sodium Oxide and H2O content is in your home made water glass. You may need to dehydrate the water glass after Co2 gassing. By heating it changes the solubility in the water contained in the bond and can soften the bond to a soft paste. Low drying temperature (70 °C), sodium silicate acts as a thin layer of glue covering sand grains and bind them to each other, while at high temperature (150 °C), dissolution-precipitation reaction occur in the mixture forming stronger granular system. The concentration of H2O in the water glass will change the bond and require different processing. N-Grade Sodium Silicate 3.22 parts of Silica DiOxide to 1 part of Sodium Oxide, 37.6% 8.90+28.7=37.6, 62.4% is water. RU-Grade Sodium Silicate 2.40 parts of Silica DiOxide to 1 part of Sodium Oxide, 47.05% 13.85+33.2=47.05% - a 25% increase in active ingredients over the N-Grade!! This is a thicker heavy syrup.
@@arielkozak using distilled water helps all contents used to be absorbed. Using tap or spring water may not achieve that cause they have other products that are already absorbed into the water itself.
If you buy sodium silicate and start boiling it in a SS pot, you can keep adding citric acid powder till you start seeing the small drops of silica precipitating out of the solution, you need to stop adding acid as soon as you see first sign of it. Now you've colloidal silica which is used as a binder in refractory industry.
Also if you mix baking soda and vinegar in a jar it will produce CO2 which can be used to cure a core in a second jar connected with a vinil tube.
Great input on the refractory information
After Curing with CO2 you get basically Silica Gel and Sodium Carbonate. The Silica Gel is SiO2 with lots of Hydroxide (OH) and water on its surface. by heating it you drive the water & Hydroxide away hence convert all Si-OH-Si bonds to Si-O-Si bonds which are responsible for the much harder material you are left with
What at 150c for 12 hours but you must keep it wrapped up to keep the water in
Or just keep it covered(airtight) for 24-48 hours at room temp
If you want to get cheap source of easily dissolvable silica, you can get it from rice husk ash, it contains 90% fine silica powder. Or you can use rice husk as your furnace fuel.
Dude that's crazy haha. That's so neat! Thanks for sharing this! 😊🌎💖
amerika g ada sawah
@@dogodogo5891 cb lihat di Sacramento
@@dogodogo5891America produces about 8 million tons of rice per year
"Taken from wikipedia" Refractory use
Water glass is a useful binder of solids, such as vermiculite and perlite. When blended with the aforementioned lightweight aggregates, water glass can be used to make hard, high-temperature insulation boards used for refractories, passive fire protection and high temperature insulations, such as moulded pipe insulation applications. When mixed with finely divided mineral powders, such as vermiculite dust (which is common scrap from the exfoliation process), one can produce high temperature adhesives. The intumescence disappears in the presence of finely divided mineral dust, whereby the waterglass becomes a mere matrix. Waterglass is inexpensive and abundantly available, which makes its use popular in many refractory applications.
Also "Liquid glass" (sodium silicate) is added to the system through the radiator, and allowed to circulate. Sodium silicate is suspended in the coolant until it reaches the cylinder head. At 100-105 °C (212-221 °F), sodium silicate loses water molecules to form a glass seal with a remelt temperature above 810 °C (1,490 °F).
So from what they say the waterglass will remelt at temps over 810 °C (aluminium lead and zinc should be ok for molds?).
should add a little portland cement and cooked lime to the mixture
Hello, i make my own water glass. Recipe is 500 ml distilled water, 200 grams ( by weight ) sodium hydroxide and 300 grams ( by weight ) cat crystals. It comes out very well. I use it when making melting furnaces to glue the kaowool to the lid of the furnace and sometimes on the sides of the furnace. However, i have found through many recipes that its used in NOT to use it for high temperature refractory, it will fail. When achieving temps for melting brass and copper, the water glass will melt when exceeding 1900’f. I had a lid to a furnace which i used sand, water glass and perlite mixture and it completely melted into the crucible. It is not good for high temp refractory diy mixes. The water glass recipe above i have made about 4 batches and store it in a 1500 ml jug. It never hardens in the jug. It the mix/recipe is not right it will harden within days of being in a jug. I have experienced that also when i converted grams to ounces like a ding bat instead of weighing grams by weight. The mix hardened within days. Hope this helps. And do not use tap water or any other water but distilled. It has to be able to absorb all contents used. Hope this helps some.
Also firing the water glass helps cure it fast. Not direct flame hitting it but high temp will cure it faster and rock hard. Putting it in oven to help harden it some is a start but then fire curing it harden/cures it completely.
@@backporchfoundryandforgeus900 for example I'm making a forge hoping to use water glass over ceramic fibre insulation, would you glue the blanket in eith the eater glass then light a fire inside the forge to cure it?
My understanding is in itself its not a refractory material. The sand wont help in this. I plan on experimenting with this stuff but will add a refractory material like silicone carbide or aluminum oxide. Both of which are reasonably cheap as blasting media or rock tumbler grit
Guys if you have any feedback regarding water glass , please drop us a line in the comments , alot of viewers read the comments looking for that cat that really knows the down low .
Here's a tip dry mix 2% garden lime into your sand before adding the water glass
make your mold COMPRESS the sand
just like you would with GREEN SAND
Cure with CO2
Pour METAL
let cool
remove part from mold
set up mold for next pour
CO2 is needed to harden the sand/waterglass according to my understanding
if you use pretty litter it has bromo blue in it ad will harden while sitting especially if cold
Did you cure it in a CO2 bath or blast it with CO2?
That's what turns it into a high temperature cement.
I saw someone, probably luckygen, use sand, molasses and probably water glass to make a core. (4 year old video)
Mixing a bit of charcoal into the sand should also harden the mix up in a hour.
great input
Yes but the gas had argon in it , not sure if that matters
@@NOBOX7 argon is supposed to be non reactive, so it's very unlikely, unless it's like 10% carbon dioxide to 88% argon
must be driving the CO2 off again i figure, not sure. cool research goin on here
I have a couple of questions. What recipe for the water glass would you use to make your own firebrick (to be used inside a BBQ smoker fire box) and do you have a good recipe for making fire brick? Thank you!
It is hard to tell what the concentration of Silica DiOxide, Sodium Oxide and H2O content is in your home made water glass. You may need to dehydrate the water glass after Co2 gassing. By heating it changes the solubility in the water contained in the bond and can soften the bond to a soft paste. Low drying temperature (70 °C), sodium silicate acts as a thin layer of glue covering sand grains and bind them to each other, while at high temperature (150 °C), dissolution-precipitation reaction occur in the mixture forming stronger granular system. The concentration of H2O in the water glass will change the bond and require different processing.
N-Grade Sodium Silicate 3.22 parts of Silica DiOxide to 1 part of Sodium Oxide, 37.6% 8.90+28.7=37.6, 62.4% is water.
RU-Grade Sodium Silicate 2.40 parts of Silica DiOxide to 1 part of Sodium Oxide, 47.05% 13.85+33.2=47.05% - a 25% increase in active ingredients over the N-Grade!! This is a thicker heavy syrup.
Thanks for the feedback chuck , great info here .
I made a bunch of water glass for a furnace insulation. Haven't gotten the chance to test it yet. So I'm very interested to see what you come up with
How'd you go mate I'm about to do thr same...
Great video thanks 😊
What sand did you use....should be using silica sand
Potassium silicate is better FYI
white ashes?
Very interesting stuff. Have you tried super heating with molten metal or a blow torch to see if they need curing?
yes im gonna post the finding tonight
@@NOBOX7 results?
Do you use distilled water?
no i didnt
@@NOBOX7I don't think it would make a big difference but Its best to use distilled water but its not critical the online forum says
@@arielkozak using distilled water helps all contents used to be absorbed. Using tap or spring water may not achieve that cause they have other products that are already absorbed into the water itself.