Methylene Diphenyl Diisocyanate (MDI) 


Methylene Diphenyl Diisocyanate (MDI)

Methylene diphenyl diisocyanate, most often abbreviated as 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.

The 4,4' isomer is most widely used, and is also known as 4,4'-diphenylmethane diisocyanate.   This isomer is also known as Pure MDI. MDI reacts with polyols in the manufacture of polyurethane.

Applications of methyl diphenyldiisocyanate ( MDI (

"MDI" reacts with "Polyol" and produces polyurethane. The major application of 4,4'-MDI is the production of rigid polyurethane. These rigid polyurethane foams are good thermal insulators and used in nearly all freezers and refrigerators worldwide, as well as buildings. 4,4'-MDI is also used as an industrial strength adhesive, which is available to end consumers as various high-strength bottled glue preparations.

"MDI" can be used in the production of various thermal insulators in various industries, such as manufacturing of sandwich panels and isolating tubes, refrigeration and refrigerating industry, automotive industry, such as car seats, dashboards, and interior panels.

Loading and shipping conditions:

MDI is the least hazardous of the commonly available isocyanates but is not benign. Its very low vapour pressure reduces its hazards during handling compared to the other major isocyanates (TDI, HDI). However, it, like the other isocyanates, is an allergen and sensitizer. Persons developing sensitivity to isocyanates may have dangerous systemic reactions to extremely small exposures, including respiratory failure. Handling MDI requires strict engineering controls and personal protective equipment. Compared to other organic cyanates, MDI has a relatively low human toxicity. It is a potentially violently reactive material towards water and other nucleophiles.

MDI barrels should be kept in sealed containers and protected against moisture and external substances.

The MDI product should not be exposed to compounds containing hydrogen, such as water, amines, and alcohols. Exposer may lead to explosions.

Be extremely careful, MDI product are highly flammable.

Long-term storage of "MDI" at above or below the recommended temperature can result in product maltreatment.

Loading and warehousing operators should be trained and equipped with appropriate safety equipment. The trucks must be in accordance with the respective protection law and regulations. As a general rule of thumb, keep "MDI" only in safe places.

Packaging Details:

220 liter (about 250 kg) steel barrels are used for the packaging of the MDI product and every 4 barrels are placed on a pallet