This International Standard is applicable to protective clothing for workers exposed to heat. The clothing consists of outer garments made from flexible material to protect specific parts of the body. Hoods and gaiters are included but all other types of protection for the head, hands and feet are excluded. This International Standard specifies the performance requirements and test methods for protective clothing materials and gives design recommendations for the clothing where necessary. Protective clothing complying with this International Standard is intended to protect workers against brief contact with flame and against at least one type of heat. The heat may be in the form of convective heat, radiant heat, large molten metal splashes, or a combination of these heat hazards. Protective clothing complying with this International Standard may not be entirely suitable for certain types of activity carried out by firefighters and welders.