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Can I use these instead of stainless needles?

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  • Can I use these instead of stainless needles?

    I am having a very difficult time finding stainless steel needles but I have found Dramix 3D steel reinforcing fibres. They are not stainless. Can I use them to reinforce a home brew cast oven? Thanks.

  • #2
    No, I wouldn’t. There is a reason stainless are the recommended reinforcing and that is because they are in an environment where moisture and heat are big contributors to corrosion. Better to leave them out.
    Kindled with zeal and fired with passion.

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    • #3
      Thanks david, looks like I’m back to the drawing board. Do you know of any other product that would be ok to use? Nothing but dead ends trying to track down these needles here.

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      • #4
        Check with David S, i believe he says AR (alkali resistance) glass fibers may be substitute for melt extract fibers (aka SS needles)
        Russell
        Google Photo Album [https://photos.google.com/share/AF1Q...JneXVXc3hVNHd3/]

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        • #5
          Have you seen these?

          Refractory Reinforcing 1" 430 Stainless Steel Needles

          I had a link but found out I couldn't do that so here's what they are called
          You can also do a search under this discription.
          refractory reinforcing stainless steel fiber
          Last edited by BenKeith; 02-20-2021, 09:06 AM.

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          • #6
            Originally posted by UtahBeehiver View Post
            Check with David S, i believe he says AR (alkali resistance) glass fibers may be substitute for melt extract fibers (aka SS needles)
            I use both melt extract fibres (stainless steel needles) as well as AR (alkaline resistant fibreglass fibres and carbon nanotube fibres in conjunction with castable refractory. But if you are using a home-brew castable (3:1:1:1 sand hydrated lime, powdered clay), the most important fibre addition is the very fine polypropylene fibres, which burn out and give the castable a degree of protection from steam spalling. You can skip the reinforcing fibres, it will still work ok.
            Kindled with zeal and fired with passion.

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            • #7
              Any thoughts on Basalt Fiber to reinforce the dome instead of stainless steel needles...

              Basalt fiber is a relative newcomer to fiber reinforced polymers (FRPs) and structural composites. It has a similar chemical composition as glass fiber but has better strength characteristics, and unlike most glass fibers is highly resistant to alkaline, acidic and salt attack making it a good candidate for concrete, bridge and shoreline structures.

              2021 update: No longer a newcomer, basalt FRPs are competing with E-glass FRPs in the marketplace. Similar in mechanical properties, basalt FRPs have gained the equivalent mechanical properties of E-glass FRPs with the Florida Department of Transportation (FDOT) and other agencies.

              Compared to carbon and aramid fiber, it has the features of wider application temperature range -452 F to 1,200 F (-269 C to +650 C), higher oxidation resistance, higher radiation resistance, higher compression strength, and higher shear strength. (Note that application temperatures of FRPs are limited by the glass transition temperature of the matrix, which is lower than the application temperature of the fibers.)

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              • #8
                Sounds like they’ll be ok, but only just, as 650C is the top of their range, which is only a bit more than the temps it will see in an oven. Presumably they begin to melt at anything north of 650C. I’ve been experimenting with carbon nanotube reinforcement which is working well so far.
                Kindled with zeal and fired with passion.

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