Permies Toolbox at the Top of this Thread and clickedon> Search I was allowed to type in Waterglass into the Google search engine and do a search just within our own ''pCloud''
and retrieved 10 previous 'Waterglass' Threads !
Our ''pClould'' may not be as wonderful as apples 'iCloud' , but it works !
For other fellow members there is a good article on Waterglass at Wikipedia !that may be helpful, Potassium silicate has been described to me as a much less corrosive and
safer 'Waterglass' For th' craftBig AL !
Big Al, it may be that in 'Furnace Cement' they use it as an extra source of silicate to balance out the proportions of the resulting calcium alumino-silicate (what normal people call "cement"), but I wouldn't expect it to migrate to the surface of the material and make a slick glassy coating. For that, you would have to cast and dry your piece of clay/pottery/adobe/cob/mud/concrete/etc, and then paint it on and heat it to get it to glassify.
the cartridge, pouring in the measured amount of powder from the cartridge, wading up the paper and then using a wooden rod to ' Drive the charge home' ( not having enough
teeth to Bite the bullet and tear the cartridge was a disqualification from serving ! -or a note from a dentist that you had bad/soft teeth! )
The Point here is the original paper cartridge was glued together with waterglass ! A major use of waterglass today is in the manufacture of Cardboard boxes, So go out there
and scrounge some waterglass from a box maker ! And experiment, and tell us how you did !
Thomas Rubino : There is a type of Automobile muffler repair kit that goes under the name Muffler Bandage, it makes good if brittle repair that will last a fairly long time if not
hit or subject to twisting forces ! It would seem if the sodium silicate can become part of the mix that its durability should improve ! Big AL !
Matt Walker wrote:Tom, I don't know ratios when using straight solution, but water glass is the hardening agent in Furnace Cement, which is why I use it in my casting mix.
I am about to start experimenting with making my own firebricks and casting some RMH parts.
Can your share your recipe?
John McDoodle wrote:I think Matt shared it before as 14 parts clay, 14 parts perlite, and 1 part refractory cement. But correct me if I'm wrong, because I'm not positive, but I think that's what Matt shared as a recipie before
That sounds pretty clay heavy. I'm going to use perlite, fireclay(with grog) lime instead of cement and a little waterglass to harden the mix.
I just need to work out the percentages.
Firebrick splits (1 1/4" thick) facing over the castable for areas subject to abrasion may be a good compromise between strength and insulation.
Waterglass is not caustic. How could we eat eggs from a jar of the stuff if it were?
It is a high temp bonding agent of excellent strength, adhesion and durability.
It can be made cheaply using silica gel and sodium hydroxide. Sodium hydroxide IS VERY CAUSTIC. Silica gel is made from sodium silicate and can be converted back to a very pure form by reaction with sodium hydroxide. Silica gell is free in dessicant drier packs you find in all kinds of things. Or buy a cheap bag of silica gel kitty litter. Sodium hydroxide is drain cleaner or what you call lye, we just call it caustic. It must be the 99% pure with no additives type; usually a pearl consistency.
Once you have your waterglass you can mix it with playsand and mould it into your desired shape; case harden it with co2 then, slowly at first, heat fire it in stages up to full temp. Be patient, it's worth it.
You can experiment with pearlite and or vermiculite admixtures but the above is a domestic version of how commercial hot face firebricks are made.
Do a little research for the weights, measures and procedures. You will enjoy that more and get a broader range of opinions than if I just tell you. The utube videos convey more than words. People use this method to cast furnaces. It's industrial, cheap and easy to DIY.
Here is a link to start you off. It's straightforward and direct and he has a similar one for the waterglass.