Mô tả
PAPI* 27 polymeric MDI is a polymethylene polyphenylisocyanate that contains MDI. This product has a narrow molecular weight distribution and a high reactivity. Applicable to many foam processes, this product is compatible with rigid polyether and polyester polyols, making it suitable for a full range of low- to high-density semi-rigid foams, rigid foams and structural RIM processing.
NOTE: To maintain product quality and easy handling, this product must be stored between 75° to 105°F (24° to 41°C). Shipping and storage temperatures vary with conditions; see Storage section.
Typical Properties1
| Properties | Typical Value1 |
| Average molecular weight | 340 |
| “Functionality” | 2.7 |
| 2 | |
| Isocyanate equivalent weight3 | 134.0 |
| NCO content by weight, %3 | 31.4 |
| Viscosity, cps @ 25°C3 (77°F) | 150-220 |
| Typical viscosity growth, cps/mo. @ 25°C4 (77°F) | 5-10 |
| Vapor pressure, mm Hg @ 25°C (77°F) | <10-5 |
| Decomposition point °C (°F) | 230 (446) |
| Extrapolated boiling point, °C (°F) | 330 (626) |
| Flash point, °C, ASTM D 93 Closed Cup (°F) | >204 (>400) |
| Acidity, % as HCl3 | 0.017 |
| Density, g/ml @ 25°C (lb/gal. @ 77°F) | 1.23 (10.3) |
| Coefficient of thermal expansion, kg/l/1°C | 0.0008 |
| Specific heat, gm•cal/gm•°C | 0.43 |
| Thermal conductivity, gm•cal/cm•sec•°C | 0.0003 |
Applications
- Appliance foams
- Portable coolers
- Automotive interior foams
- Furniture
- Building panels
- Spray insulation
- Structural foams
- Refrigerated truck insulation
- Insulated doors
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