Methylene diphenyl diisocyanate (MDI) is an aromatic diisocyanate. Three isomers are common, varying by the positions of the isocyanate groups around the rings: 2,2′-MDI, 2,4′-MDI, and 4,4′-MDI .

Jan 30, 2025 · Diisocyanates are well known dermal and inhalation sensitizers in the workplace and have been documented to cause asthma, lung damage, and in severe cases, fatal reactions. Worker exposures are already subject to protective controls in occupational settings.

Methylene Diphenyl Diisocyanate | C15H10N2O2 | CID 7570 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.

Methylene diphenyl diisocyanate, most often abbreviated as MDI, is an aromatic diisocyanate. It exists in three isomers, 2,2'-MDI, 2,4'-MDI, and 4,4'-MDI. The 4,4' isomer is most practically useful, and is also known as Pure MDI. MDI is reacted with a …

4,4'-Methylenediphenyl Diisocyanate (MDI) 101-68-8 Hazard Summary The commercial form of 4,4'-methylenediphenyl diisocyanate (MDI) is used to produce polyurethane foams. Acute (short-term) inhalation of high concentrations of MDI may cause sensitization and asthma in humans.

The most commonly used isocyanate in urethane adhesives is MDI. The pure material methylene diphenyl-isocyanate is a solid that melts around 37°C. Many variations of MDI are commercially available, and these variations fall into three major classes: monomeric MDI, ‘modified’ MDI's, and polymeric MDI's.

This Action Plan addresses the use of methylene diphenyl diisocyanate (MDI) and related compounds (See Appendix 1) in products that may result in consumer and general population exposures, particularly in or around buildings, including homes and schools.

Methylene diphenyl diisocyanate (MDI) in commercial form typically exists as a mixture of 4,4'-MDI (monomer) and certain oligomers of MDI (Encyclopedia of Chemical Technology, 1983). It has a CASRN of 9016-87-9. The content of monomeric MDI generally is between 45% and 65% on a w/w basis (Mobay, 1983). The mixture is designated as polymeric MDI

4,4′-Methylenediphenyl diisocyanate (MDI) is used to produce polyurethane foams. MDI is a light-yellow fused solid or it may occur in crystalline form. Inhalation and dermal exposure can occur during the manufacture and use of MDI.

Feb 7, 1998 · Chemical Structure for Methylene Diphenyl Diisocyanate (monomeric MDI) and polymeric MDI (PMDI)