Methylene Diphenyl Diisocyanate (MDI) is a highly versatile chemical compound used in the production of polyurethane foams, adhesives, coatings, and elastomers. It is a diisocyanate, meaning it contains two isocyanate (-NCO) functional groups that react with other compounds containing hydroxyl (-OH) groups to form polyurethane polymers.
MDI is a light yellow to brownish liquid with a characteristic odor. It is primarily used in the production of rigid polyurethane foams for insulation in construction and refrigeration applications, as well as in flexible foams for cushioning and comfort applications.
MDI is also used in the production of adhesives and sealants, coatings, elastomers, and other specialty polyurethane products. It is valued for its high strength and durability, as well as its resistance to heat, chemicals, and moisture.
However, MDI can be hazardous if not handled properly, and exposure to MDI can cause irritation to the eyes, skin, and respiratory system. Therefore, proper protective measures and handling procedures should be followed when using MDI.