 Aryl polyphosphonates, ARPPN, have been shown to be effective flame retardants for various polymers such as thermoplastics, thermosets, polycarbonate, polyesters, and polyamides. These compounds are characterized by their high thermal stability and desirable flow characteristics when used in polymeric materials. Additionally, they can contain hetero-atoms which enhance their flammability properties. This article was offered by Li Chen and Yu Zhong Wang.