Aluminosilicates can be obtained directly from the aluminosilicate rocks or manufactured as synthetic materials. Natural aluminosilicate powders used in investment casting are supplied with diverse Al2O3 content. Malachite, for instance, ranges in 42–47% compared to 60% in Remasill or Mulgrain 60%. The content of Al2O3 in the powder determines its resistance to heat—the higher, the better.
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