[TheForge] Strengthening castable refractory
GHS
[email protected]
Wed Aug 27 12:36:01 2003
I am not sure that I could cut that many needles in the amount of time
that $9 would buy.
Mike Graf
Bruce Freeman wrote:
> What exactly ARE these SS needles? Short pieces of wire? How 'bout
> just cutting up some SS wire, instead of paying $9/lb forSS?
>
> Bruce
> NJ
>
> >>> [email protected] 08/26/03 09:14PM >>>
> I received some technical info from Mt. Savage on the Delta t Crete 25
> insulating castable I'm about to use. In case anyone's interested here
> are a couple of the specs:
> Density after drying: 54 lbs/ cu.ft.
> Max service temp: 2500 degF
> Therm conductivity: 1.4 BTU/Sq.Ft./Hr/degF/in. at 500 degF
> 1.9 at 1500 degF
> 2.3 at 2000 degF.
> Water for casting: Approx. 55% by weight
>
> Now a question. The best way to prevent checking is to use the minimal
> amount of water. They give an approximate amount, 55%, but how do I
> tell
> when it's enough? From what I've read on other mixes, it should be
> just
> enough to hold it together when clumping it in your hand. Does that
> sound right?
>
> My local refractory place has SS needles for $18 / 2 lb bag. Sounds a
> little expensive, but not too expensive.
>
> Hopefully I'll get to casting this weekend. The shell is just about
> done.
>
> --
> Marc Godbout
> http://www.ironringforge.com
>
> New England Blacksmiths Membership Director
> http://www.newenglandblacksmiths.org
>
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