Radians SV45-2 Self Extinguishing Economy Class 2 Limited FR breakaway vest with 3 Pockets. Polyester vest for limited incidental flammable hazards incidental exposure to FR hazards. Typical applications would be Ship Building, Steel Erection, Bridge Building, Fabrication, Asphalt Paving, and other applications involving FR hazards that result from errant sparks rather than open circuit electricity or a potentially explosive atmosphere. Non-durable FR protection is achieved by chemically treating a material that is not fire retardant by itself, but becomes self-extinguishing after the treatment.