Protective performance requirements of chemical oxygen self-rescue breathing apparatus: the protective time of breathing apparatus should not be less than the rated protective time; With2min 2 minutes after the start of the protection performance test, the oxygen volume fraction in the respirator gas storage bag should be no less than 17% for 2 minutes, and no less than 21%for the rest of the protection time; During the protection time, the volume fraction of carbon dioxide in the gas storage bag should be no more than 65438 0.5%, and the maximum is no more than 3.0%; During the protection time, the gas storage bag shall not be empty; During the protection time, the suction temperature should not be higher than 60℃; During the protection time, the sum of inspiratory resistance and expiratory resistance should be no more than 1600Pa, and the maximum single resistance of inhalation or exhalation should be no more than 1000Pa.