Staring out into a rare bit of sunshine here in Western Michigan thinking about the planned start of a rocket stove build per the available funds. A brief internet search on ceramic fiber board surfaced some machinable ceramic insulation (https://www.grainger.com/product/IIG-1-in-x-24-in-x-48-in-Calcium-19NE52) offered by Grainger.
The temp rating is a bit lower than the 2300F most often referred to in the forum, so I was wondering if this is a suitable substitute. Any guidance is welcome. Thank you.
Interesting. I did a LOT of shopping around and spreadsheeting of specifications and costs when I was looking for CFB recently and never saw this Calcium Silicate product. 1700 degrees F is not a high enough rating though. And $189 for one board is way too much for something sub-par when you can get 2300 or even 2600 F degree rated material cheaper. I am intrigued by the "no dust" claim and I'd love to get my hands on a sample to see how strong it is. It might even be great for some parts of a rocket stove, but that temp rating is too low for a heat riser and sketchy for a firebox.
I might trust this to surround and insulate refractory material, like a way to contain and support fire bricks in a batch box core. But as your fire contact material, I'd be weary.
Hi Justin; Welcome to Permies! And A Big Welcome to Rocket Science!
Sadly, the board at grangers is not good enough for use in a batchbox at all or in the riser of a J tube.
It would however work just fine in the burn tunnel of a J tube.
I tried to use 1750F insulated firebricks in a batchbox. They completely failed in a few days!
Matt: My father in law told me about the possibility of Grainger carrying what I wanted. He only mentioned it after I told him that items on Amazon could get damaged in the shipping process. Having the item shipped to a local Grainger store would allow me to review the item and turn down any damaged material. It seemed reasonable, so I reached out to those who are more knowledgeable to see if it was up to spec.
Any chance you would be willing to share some your spreadsheeting data?
Tom: I could definitely get on board with 3000F rated bricks but a 9 hour drive is a stretch. I will have to continue my search locally.