At Proppant.Today we blog about the proppant industry and the unconventional oil and gas basins. Proppant is the material that is used in hydraulic fracturing to “prop open” the cracks that allow oil and gas to flow into the well. Proppant is either natural or manufactured. Natural proppant is sourced from a high purity silica sand, known as frac sand. Manufactured proppant is made from ceramics and fly ash. Manufactured proppants include coated proppants like resin coating.