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Pete VanderLaan 08-02-2018 09:06 AM

Recent refrasil sources?
The title speaks for itself.

Eben Horton 08-02-2018 09:08 AM

Pete VanderLaan 08-02-2018 09:36 AM

thanks Eben, I would need smaller quantities for a client. Enough to do a small Stadelman furnace.

Eben Horton 08-02-2018 12:01 PM

Joe phiefer (sp?) had a bunch and was selling it in small quantities a few years ago.

Eric Trulson 08-02-2018 12:44 PM

He doesn't stock Refrasil, but John Han over at Rubix Composites has a roll of coated fiberglass cloth (it's normally used as welding blanket) in the warehouse that is good up to 1000F. Should be just fine for laying over a furnace top to keep down the silica dust. (Direct quote from John: "If the top of their furnace is getting that hot, they have waaaaay bigger problems than this blanket's temp rating"). Comes in a 60" roll and is sold by the yard.

phone: (781) 935 - 2221

Disclaimer: I work at Rubix as a sales/process engineer a few days a week. I don't get any sales commissions or kickbacks or anything, and have no financial motivation to push their stuff. Any recommendations I make are done in good faith as a glassblower.

Sky Campbell 08-02-2018 05:33 PM

Hazard Fraud has welding blankets that hold up well in the annealer so I would say safe to use to cover exterior fiber. That is the cheapest source I have found and can be picked up locally.

Eben Horton 08-03-2018 06:08 AM

Why not use pink fiberglass home insulation? I use that as the top layer under a sheet metal skin. It works great

Pete VanderLaan 08-03-2018 07:55 AM

If you have a sheet metal skin, it performs the same function as the refrasil and you no longer need it. Refrasil contains the fiber but it has no insulation value.

Rollin Karg 05-07-2019 12:42 PM


I've used this for awhile,with good results.

Victor Chiarizia 05-08-2019 07:54 AM

im a fan of vermiculite/perlite stucco. quite sculptural and pretty. :D vic

Travis Frink 05-08-2019 09:04 AM


Originally Posted by Victor Chiarizia (Post 144036)
im a fan of vermiculite/perlite stucco. quite sculptural and pretty. :D vic

Is that the 1:1:1 vermiculite:ball clay:Portland cement mix?

Shawn Everette 05-08-2019 09:29 AM

Wale has this

Pete VanderLaan 05-08-2019 09:59 AM


Originally Posted by Travis Frink (Post 144037)
Is that the 1:1:1 vermiculite:ball clay:Portland cement mix?

That was my mix of choice. It works really well. It was an old favorite of Illinois Southern Univ.

Travis Frink 05-08-2019 07:26 PM


Originally Posted by Pete VanderLaan (Post 144039)
That was my mix of choice. It works really well. It was an old favorite of Illinois Southern Univ.

Thank you. Would this be effective as an outer (3rd layer?) insulation layer over say hight temp castable and fiber or two layers of fire and high temp insulating brick for example?

How did you use it? What should be considered in using it? Limitations or possibilities, etc?

Pete VanderLaan 05-09-2019 07:59 AM

I used it on a good sized set of furnaces back in the color rod days. As I recall, I put it over a crown made of Mizzou at the time and the very hot face part melted a touch but it was six inches thick so it was fine. We mixed it on a tarp on the blowing floor with hoes. It came up the consistency of a typical castable while applied- two hands could hold a good sized hunk of it. Once in place, it could be pushed around pretty easily and we troweled it to a very smooth outer surface that could be vacuumed.

The only funny time I had with it was once when making gold sands, I had mixed about a quart of the fluid and one of my employees put it on top of the crown, a bad idea. The container cracked and dumped the mix on the castable which in turn drilled right into the furnace. I think I lost an ounce of gold, the crown and my dignity.

Wear a respirator. Vermiculite is not to be trusted. It does contain asbestos

Ed Pennebaker 05-09-2019 09:19 AM

I used the vermiculite mix for an annealer roof and door, 3-3.5" thick. It shows some cracks but has been working for 30 years.

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