Promoted by national project of Japan to advance technology in the field of investment casting, synthetic mullite spherical particles (primary stucco material) and synthetic mullite powder (filler material for primary slurry), were developed as a new artificial molding material to replace zircon sand.
As a result of trials, the following effects were observed upon production of investment casting using aluminum, cast steel, and stainless steel.
Trial results for practical application proved these materials can sufficiently supplant zircon sand and zircon flour.