国产日本卡二卡三卡四卡,免费国产理论视频,三级亚洲中文字幕,日韩av片高清在线观看

96%powder Paraformaldehyde is mainly used in the manufacture of various synthetic resins and adhesives, and also used in the production of fumigants, fungicides and insecticides.

First, the harm of polyformaldehyde to health:

Invasion route: inhalation, ingestion, percutaneous absorption.Paraformaldehyde is strongly irritating to respiratory tract, causing rhinitis, pharyngitis, pneumonia and pulmonary edema.It can sensitize the respiratory tract.Direct eye contact can cause burns.Irritating to the skin, causing skin redness and swelling.Oral administration strongly irritates the skin and causes dryness, chapping and desquaking after long-term repeated contact.

Dangerous characteristics of paraformaldehyde: in case of open flame, high heat or contact with oxidant, there is a risk of combustion.Decomposition by heat gives off flammable gases which can form explosive mixtures with air.Powder and air can form an explosive mixture, when it reaches a certain concentration, it will explode when it meets Mars.