Product Description
Polyphenyl polymethylene isocyanate (PAPI), also known as crude MDI, is a light yellow to brown viscous liquid with a characteristic irritating odor. It has a relative density of 1.2 (20°C/20°C), a flash point of 218°C, and a freezing point below 10°C. The viscosity at 25°C ranges from 200 to 1000 mPa·s.
PAPI is a mixture consisting of approximately 50% MDI and 50% polyisocyanates with a functionality greater than 2. When heated, it is capable of undergoing self-polymerization. The product is readily soluble in organic solvents such as chlorobenzene, o-dichlorobenzene, and toluene.
Properties
| Boiling point | 392 °C5 mm Hg |
| density | 1.2 g/mL at 25 °C(lit.) |
| vapor density | 8.6 (vs air) |
| refractive index | n20/D 1.634 |
| Fp | >230 °F |
| storage temp. | Refrigerator, Under inert atmosphere |
| solubility | DMSO (Sparingly), Ethyl Acetate (Slightly), Methanol (Soluble) |
| form | Oil |
| color | Yellow to Orange |
| Stability: | Stable. Incompatible with strong oxidizing agents, alcohols. May decompose in moist air, or on contact with water. |
| InChI | InChI=1S/C7H5NO.CH2O/c9-6-8-7-4-2-1-3-5-7;1-2/h1-5H;1H2 |
| InChIKey | JTEOXXUIKUHXLD-UHFFFAOYSA-N |
| SMILES | O=C=NC1C([H])=C([H])C([H])=C([H])C=1[H].O=C([H])[H] |
| IARC | 3 (Vol. 19, Sup 7) 1987 |
| EPA Substance Registry System | Polymeric diphenylmethane diisocyanate (9016-87-9) |
| Hazard Codes | Xn,T+,T,F |
| Risk Statements | 20-36/37/38-42-42/43-26-22-39/23/24/25-23/24/25-11-20/21/22 |
| Safety Statements | 26-28-38-45-36/37-23-16-7-36 |
| WGK Germany | 3 |
| RTECS | TR0350000 |
| Hazardous Substances Data | 9016-87-9(Hazardous Substances Data) |
Product Application
Polymethylene polyphenyl polyisocyanate is primarily used in the production of polyurethane materials. It is widely applied across various industries, including construction, automotive, and electrical manufacturing. Common applications include thermal insulation materials, cushioning products, mattresses, and other polyurethane-based products.
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