I've read that waterglass (sodium silicate)can withstand temperatures up to 1100°C. That's lower than basic CFB can withstand
I hit a sample of sodium silicate treated cfb with a 3000 degree f (2012c) yard torch. Full blast, glowing red. Had a nice hard feel and "plink" sound when dropped. Not a very analytical test, but that's my experience. The cfb on it's own desinigrates with that much abuse.
tested few small pieces, this CFB is rated for max 1260C:
burned them with small torch for about a minute, I think it also reach max around 1250C. There was a bad burn smell comming (binders or whaterver chemicals) so that's not good.
Here are the samples, from left to right:
1. untreated cfb
2. cfb top layer painted with waterglass
3. cfb whole painted with waterglass
4. cfb top layer painted with clay+sand
5. cfb whole painted with clay+sand
1. untreated cfb - bit softer/weaker but not as bad as in foxtatic's video 2. cfb top layer painted with waterglass - hard top layer developed 3. cfb whole painted with waterglass - hard layer developed 4. cfb top layer painted with clay+sand - bit harder top layer developed but not hard as the waterglass 5. cfb whole painted with clay+sand - bit harder layer developed but not hard as the waterglass
so I think it's defenetely worth coating cfb, even with mud. I don't know how much insulation value is lowered but I think not much since material is still very light. I think I'll paint all sides with waterglass and btw the one I used is like 30 years old
I have had better results coating ceramic fibre board with water glass after it has been heated. I have found that coating the board before it has been heated cause the water glass to crack and peel off, water glass seems to work well on vermiculite, it does not stop it cracking but does harden the surface.
TexasGonzo: Sooooo glad I found this site! Its always rewarding to find such a super group of folks! To any and all, feel free to PM me anytime. Thanks for having me!
Mar 11, 2019 18:56:41 GMT -8
jlmtech: GADGET: CONSIDER USING A JET PUMP INSTEAD OF A BLOWER FAN TO INDUCE DRAFT; NO CLOGGING.
Mar 26, 2019 8:19:28 GMT -8
michaelegan: i am unable to open the sketchup files on my mac. I used sketchup a few years back but apparently the company now requires a subscription. does anyone have any advice/instructions on how to use the program or how to view pictures without spending money?
Aug 20, 2019 18:41:48 GMT -8
mannytheseacow: michaelegan: download AutoCAD student version for free... import .SKP
Aug 23, 2019 13:33:44 GMT -8
topbaza: hi everyone, been searching all over net and this is were i need to be i think!!
Sept 28, 2019 6:16:25 GMT -8
anounaki: Hi, why I cant upload photos when I make new tread to this forum?
Feb 28, 2020 2:09:40 GMT -8
ahansen: photos under 1 mb not possible?
Jun 4, 2020 0:09:21 GMT -8
belgiangulch: Photo's are possible. They must be downloaded elsewhere and the image url (adress) is copyied.
Sept 14, 2020 7:26:15 GMT -8
belgiangulch: While creating a thread click on the small picture in the banner above the reply. A box pops up, paste the image url in the box. Pay no attention to the huge list of numbers and such.When you finish and hit reply your post with pictures will come up.
Sept 14, 2020 7:29:27 GMT -8
deadstarsstillburn: Hi there. I was directed this way by folks on the Permies.com website and am hoping I can get some information on how a total newbie can get started designing, siting, building, and not-dying-in-a-horrible-house-fire with a new RMH in a 160-year old home
Oct 21, 2020 6:52:10 GMT -8
deadstarsstillburn: The people over there recommended either a 6" batchbox or an 8" J-tube. I don't know what those are but am going to try to figure that out. What I need is a blueprint that I can scale to fit the need for my house. I have something likne 5000 square feet
Oct 21, 2020 6:53:00 GMT -8
deadstarsstillburn: but I do not need to heat all of it by any means. probably only need to heat half of that, maybe less.
Oct 21, 2020 6:53:15 GMT -8
deadstarsstillburn: moreover, the house has 3 storeys (large attic) so I assume if I get very efficient heating on the ground floor, that will go a long way toward heating the upstairs as well, no?
Oct 21, 2020 6:53:59 GMT -8
BenAlexanderT: Happy new year everybody. I wish you the best
Dec 31, 2020 15:06:14 GMT -8
Solomon: Anybody in Southern Oregon, in Jackson or Josephine counties?
Jan 16, 2021 21:54:43 GMT -8
gnomedome: i realsie this is from 2009
Apr 14, 2021 8:30:44 GMT -8
gnomedome: i realize this is from 2009 id love to see the photos from this ..as im looking to build a sauna soon similar to this .... if anyody sees this post firstname.lastname@example.org..... the photos in this post did not show up
Apr 14, 2021 8:32:00 GMT -8
dcoyte: I am planning to use a cast iron heat exchanger out of a hydronic boiler set on top of my rocket stove, flue out the top. There will be a pump moving the water through the heat exchanger into an unpressurized 2000 gal tank. Any thoughts?
Dec 31, 2021 6:45:55 GMT -8
syekoms: Yes just found this forum am in Josephine county.
Jun 17, 2022 12:53:32 GMT -8