Anyone familiar with Danser Vacuduct?

[aric]

I'm guessing no, but I don't suppose anyone here has experience with Danser Vacuduct? 

www.danserinc.com/what-we-do/vacuduct.shtml

Seems like a fantastic material for riser tubes, and as luck would have it a friend of my bother's has a 4 foot hunk of ~4"ID x 8"OD laying around from a failed R&D project at work.  Google has turned up nothing WRT rocket stoves, knife making, or glassblowing.  I got one or two hits on pottery, but only on an industrial scale.

The application is a maple syrup evaporator, and last year I ran 4 commercial steam trays off of a single 4.5"sq x 1/8" wall CRS rocket (with 1.5" of perlite on the burn tunnel and riser, 2" in the tub the trays sat in), and was able to get 2 of the pans to boil nicely.  Unfortunately the riser burned through towards the end, so I need to rebuild it. 

Given the inefficiency I ran into towards the end with having to boil plain water in the empty trays to keep things from warping I'm thinking splitting it into a pair of 2 tray boilers is a better idea, and more in tune with the smaller CSA of the donated material.

But if it's known to be unsuitable I'd much rather save him the trouble of shipping it to me.

Thanks!

-aric.

[matthewwalker]

Never heard of it, but it looks like it's just formed ceramic fiber insulation encapsulated in duct work. I use the same material sans the outer ducting all the time, and it works well. I think it would be a great riser.

[aric]

Exactly the reasons I figures I'd find reference to it.... Looks like exactly the sort of material we'd want, and there'd have to be leftovers somewhere. And yet, nothing.

Was going to pick up some local fire clay and do a DIY perlite castable, but friend offered it and digging a bit more it seems that this Vacuduct stuff has quite an impressive resistance to thermal transfer (1.52 BTU*in/hr*ft^2*degF). I want to say it was half of the DIY perlite, but can't seem to find the link I read the other day.

www.danserinc.com/pdf/VacuductPhysicalProperties.pdf


That said, the fact that it's currently under patent and seemingly only available in industrial quantities could have something to do with it not yet having filtered down to the DIY crowd.  Friend only has it because they were looking at buying literal tons of it, and when it didn't work out the leftovers have been sitting in the corner.