This standard specifies the terms, definitions, classification, technical requirements, test methods, inspection rules and marking, packaging, transportation, storage and shelf life requirements for calcium sulfate whiskers. This standard is applicable to the plastics industry, rubber industry, friction materials, composite materials, resin, asphalt, thermal insulation, heat insulation, flame retardant, infrared reflective materials, high insulation materials covering wires, sound insulation, paints, coatings, environmental protection and other industries. Calcium sulfate whiskers are used for toughness reinforcement.