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
Specification
| Polymeric MDI (Polymethane Polyphenyl Isocyanate) | |||
|---|---|---|---|
| ITEST ITEM | UNIT | SPEC | RESULT |
| Appearance | brown liquid | brown liquid | |
| Viscosity | mPa.s@25°C | 175-250 | 226 |
| NCO content | %(CO) | 30-32 | 30.8 |
| EHC | Mg/kg | MAX.250 | 89 |
| Density | (25°C,g/cm3) | 1.22-1.25 | – |
| Acid Content | (HCL) % | ≤0.05 | – |
| Hydrolyzable Chlorine | % | ≤0.2 | – |
Application
Isocyanates MDI is extensively application in most of field, such as thermal insulation rigid foam , PU coating , PU adhesive , Seepage – proofing , Structure foam , Automobile bumper , high resilience etc.
Packaging
In iron drum