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GREENLITE 45 L AL is a lightweight castable, ideal for cruces, troughs and insulated back-up linings
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You really need to talk to
Harbison Walker on this one. There are hundred of refractory products for special applications. Usually the "light" ones are for insulating, and you need something on the inside of your dome that will absorb and reflect the heat.
Disclaimer: I don't know anything about castable refractories.