Covestro (formerly Bayer) Desmodur 44V20L polymethylene polyisocyanate crude MDI black material polymeric MDI 9016-87-9

Safety Precautions
44V20 is less toxic in terms of respiratory inhalation and skin absorption; low volatility, making it short-term exposure under normal conditions (such as: a small amount of leakage, spilled) produce very little toxicity.
Nevertheless, because 44V20 is an isocyanate compound, it still has certain toxicity, which can cause moderate eye irritation and slight skin irritation, and can cause skin allergies. The maximum allowable concentration (TLV) of 44V20 in the air is 0.02ppm (0.2mg/m).
But it must be noted that when the temperature of the material is heated above 40°C (such as when melting) or in the workplace, it will cause suspended particles in the air Increased concentration can cause toxicity. When operating in a similar environment, gas masks and respirators should be worn, or repeated inhalation of vapors with excessive concentrations may cause respiratory allergies.
Even under normal conditions, due to the active chemical properties of 44V20, care should be taken during operation to prevent direct contact with the skin and splash into the eyes. Rinse immediately with water and skin with soap and water. 44V20 is very easy to react with water to release carbon dioxide, so the packaging container should be kept dry and sealed to prevent water from pouring in; once water leaks into the container, do not seal it too tightly, and leave a vent hole to prevent the V from bursting. .

Burning and Explosion Hazards
MDI series products are listed as Class III Class B flammable liquids in the Standard Manual of the National Fire Protection Association (NFPA); the so-called Class III Class B Flammable substances refer to those substances whose flash point is higher than 93.3°C; according to ASTM D93 (P.M.C.C) method, the flash point of MDI series products is 177~277°C.
Although the flash point is high, it is still flammable in the presence of oxygen and in the presence of high temperature and open flame; if the fire is strong, it may cause the airtight package to explode; heat The material can react strongly with water and release harmful gas.

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