Editing Sand casting (section)

===Parting compounds===
To get the pattern out of the mold, prior to casting, a parting compound is applied to the pattern to ease removal. They can be a liquid or a fine powder (particle diameters between {{convert|75|and|150|um}}). Common powders include [[talc]], [[graphite]], and dry silica; common liquids include [[mineral oil]] and water-based silicon solutions. The latter are more commonly used with metal and large wooden patterns.<ref name="rao26">{{harvnb|Rao|2003|p=26}}.</ref>