Application guide 10 / 12
Foundry Sand
A foundry mould is sand held together with a binder. The sand has to be dry, clean and consistently graded, or the casting is not.
Our product: Kiln-Dried Sand
MRP quartz sand for foundries
MRP supplies kiln-dried quartz sand to foundries, screened to their grading. Molten metal is poured into a mould formed in sand around a pattern. Sand cores form the hollows. Quartz sand is the standard moulding base: it is hard, takes high temperatures, is available in quantity and takes a binder well. Once the metal sets, the mould is broken away and the casting cleaned.
What we have to get right
Grain size and grading set the surface finish of the casting and how gas escapes from the mould as the metal is poured. Foundries specify a grading and hold to it. Moisture matters because most binder systems react to water in the sand, so it has to be dry. Cleanliness matters because silt, clay and organic matter interfere with the binder and gas off in the mould. And consistency matters most: a foundry tunes its process around the sand it has, and a change in the sand changes the castings.
The MRP product
Kiln-Dried Sand — quartz sand washed to remove silt and clay, dried in our kiln and screened to a close fraction between 0.3 mm and 6 mm — is produced to the foundry's grading and supplied dry. Because it is quarried, washed, dried and screened on one site from one deposit, the sand the foundry qualifies is the sand it keeps getting.
Supply
Bulk supply to foundries and pattern shops. Tell us the grading or sieve band, any moisture limit, the tonnage and the delivery point.