Filler/Stiffener Concentrates generally contain high loadings of a mineral substance. Depending on the application, they can impart properties to films and molded articles that include increased stiffness or a paper-like appearance. Other advantages may include increased efficiencies through more rapid cooling of the film bubble and reduced energy consumption during processing. These masterbatches typically contain 30-80% mineral content in a polymer carrier, e.g. LDPE, PP, FIDPE.