DuPont® PPDI is a specialty isocyanate which can provide cast and thermoplastic elastomers with properties unmatched by other commercial polyurethanes. Due to its small size and symmetry, the PPDI molecule provides a compact hard segment and excellent phase separation in polyurethane formulations PPDI-based elastomers show:
- Superior dynamic properties
- Exceptional abrasion resistance and flex fatigue
- Low compression set at elevated temperatures
- High temperature performance to 135C (275F) in continuous use
DuPont® PPDI is available as a free-flowing solid.
DuPont also offers thermoplastic elastomers based on Hylene® PPDI, and can refer customers to sources of PPDI-based prepolymers. Contact us for additional information on these products.
Sales Specifications
| Property | Limit |
| Purity, % | 98.5 min. |
| Residual solvent, ppm | 500 max. |
| Hydrolyzable chlorides, ppm
| 200 max. |
|
Uses
PPDI is used in seals and gaskets, pump diaphragms and oilfield service materials as well as power couplings, belts, jounce bumpers, shock absorbers, rollers and load-bearing wheels. PPDI-based elastomers serve markets in power tools, mining, automotive, sporting goods and office equipment.
Typical Physical Properties*
| Property | Value |
| CAS Number | 104-49-4 |
| Formula | C6H4(NCO)2 |
| Molecular weight | 160.1 |
| NCO Content, % | 52.5 |
| Isocyanate Equivalent Weight | 80.0 |
| Melting Point, C ( F) | 94 (201) |
| Boiling Point, 760 mmHg, C ( F) | 260 (500) |
Vapor Pressure at 20 C, mmHg
at 95 C, mmHg | 0.002
5.07 |
| Specific Gravity at 100 C | 1.17 |
| Flash Point, CCCM, C ( F) | 120 (248) |
| Viscosity at 100 C, cP | 1.13 |
Heat of Fusion, J/kg
cal/g | 184
44 |
| Specific Heat | 0.3 |
| Approximate Bulk Density of Flake | 40 lb/ft³ (641 kg/m³) |
|
Handling
Like most isocyanates, PPDI is reactive and toxic, and must be handled only by trained personnel. All exposure should be avoided. See the PPDI MSDS for additional handling information.
Packages
DuPont® PPDI is available in 90.7 kg (200 lb) and 10 kg (22 lb) net drums.
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