For large-scale applications like steelmaking, water filtration, or counterweights, you typically need to source from industrial suppliers or wholesalers.
: High-performance clay-based foundry sand produced in the USA. Available at eBay - vastovariety for approximately for bulk bags. PMC Supplies : Offers Sand Casting Sets where to buy iron sand
: A primary source for small quantities of "iron sand" or "iron filings" for weighted vests or science experiments. Prices are often under $15 for small bags. PMC Supplies : Offers Sand Casting Sets :
: An oil-free casting sand for high-detail jewelry, priced around on eBay . Fitness & Weighted Fill Fitness & Weighted Fill : Use the Thomasnet
: Use the Thomasnet Supplier Discovery Tool to find U.S.-based manufacturers and distributors of industrial sands and iron ore reps like Black Eagle Sourcing, LLC . Foundry & Metal Casting
: Specific types of black iron sand are sold as substrate for plants or fish. You can find these on Amazon or at local aquarium specialty shops.