Home / Standards / GB 11724-1989 GB 11724-1989 Abolished Health standard for dust containing 50%～80% free silica in the air of workplace 车间空气中含50%～80%游离二氧化硅粉尘卫生标准 Standard Type GB ICS 13.040.30 CCS C52 Status 废止 Issue Date 1989-07-05 Implementation 1990-07-01 Responsible Dept 国家卫生健康委 Drafting Unit N/A