väikese savisisaldusega (alla 2 %) kristallilise kvartsi (SiO2) põhine materjal vormi- või kärnisegude valmistamiseks liivvormvalus (vt ränidioksiid, liivvormvalu, vormimaterjal)
sand with very high silica content (over 95%) used for forming casting molds (see: silicon dioxide, sand casting, molding material)
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