PMDI CAS 9016-87-9 Polymethylene Polyphenyl Polyisocyanate

PMDI is very volatile and less toxic in respiratory inhalation and skin absorption, but it contains isocyanate groups (NCO) groups that are easy to react with moisture, when the material temperature is heated to more than 40℃ (such as melting) or the working environment is poorly ventilated, it will increase the vapor toxicity, in addition to the use of spraying process construction work place, it can lead to an increase in the concentration of suspended particles in the air and cause toxicity. Work in a similar environment should wear a gas mask and respirator, otherwise, repeated inhalation of excessive concentrations of steam will cause respiratory allergies. As soon as you get it on the skin or inside the eye, rinse with water and wash the skin with soap and water. Galvanized iron drum packaging, the product is non-volatile, can be transported according to the relevant provisions of the general chemicals. Due to the active chemical nature of PMDI, it is easy to react with water to generate insoluble urea compounds and release carbon dioxide, causing the drum barrel and increasing the viscosity. Therefore, during the storage process, the container must be strictly dry sealed and filled with dry nitrogen protection. PMDI should be at room temperature (20~25 deg C) in a well-ventilated room strictly sealed preservation; If the storage temperature is too low (below 5 deg C) can lead to the formation of crystallization phenomenon, so must pay attention to antifreeze. Once crystallization occurs, it should be heated and melted at 70-80℃ before use, and stirred well. Should avoid long-term storage above 50℃, In order to avoid the formation of insoluble solids and increase the viscosity. The shelf life of PMDI is 1 year under suitable storage conditions.