The Plastrol PB-HEAVY-D25/40-BK is a heavy-duty plastic smoothing and finishing media. It is designed for ultrasonic and high-speed cleaning operations and is used in high temperature applications. The media is composed of medium-sized black particles of 25-40 abrasive grade with a medium polished finish. It is highly-abrasive, non-abrasive, and resistant to dissolution and aggressive chemicals, making it especially suited for applications such as deburring, rounding, sanding, polishing, honing, and lapping. The media can also be used on metal, non-metallic, and fiberglass surfaces. Its high hardness and low friability make it ideal for achieving the desired results.