DuPont® CHDI is a specialty isocyanate which offers outstanding dynamic properties and high temperature stability in cast and thermoplastic elastomers.. Due to its small size and molecular symmetry, this aliphatic diisocyanate provides a compact hard segment in polyurethane formulations.
CHDI-based elastomers show:
- Superior high temperature dynamic properties
- Light and color stability
- Excellent solvent and abrasion resistance
- Hydrolytic stability
In addition to CHDI, DuPont® products also include PPDI specialty isocyanate. Contact DuPont for information on these products.
Sales Specifications
| Property | Limit |
| Purity, % | 99.0 min. |
| cis-CHDI,% | 0.5 max. |
| Chloromonoisocyanate,ppm
| 1000 max. |
| Residual solvent, ppm | 300 max. |
| p-Phenylenediisocyanate
| 50 max. |
| Acidity, meq/g | 0.0001 max. |
| Toluene insolubles, %
| 0.5 max. |
| Hydrolyzable chlorides, ppm | 200 max. |
|
Uses
DuPont® CHDI is especially suitable for applications in these demanding environments:
- Hot moist environments
- Oily environments
- Tear- and abrasion-prone applications
CHDI is a specialty material, used primarily in demanding applications including medical elastomers, where dynamic performance and biological stability are required. Other uses may include seals, belts, flexible tubing, coatings and films, serving markets in automotive, mining, industrial and medical devices.
Typical Physical Properties
| Property | Value |
| CAS Number | 7517-76-2 |
| Formula | C6H10(NCO)2 |
| Molecular weight | 166.18 |
| NCO Content, % | 50.5 |
| Isocyanate Equivalent Weight | 83.1 |
| Melting Point, C ( F) | 60 (140) |
| Boiling Point, 760 mmHg, C ( F) | 260 (500) |
Vapor Pressure at 20 C, mmHg
at 60 C, mmHg | <0.006
0.3 |
| Specific Gravity at 70 C | 1.116 |
| Flash Point, CCCM, C ( F) | >99 (>210) |
| Appearance | white solid |
|
Handling
Like most isocyanates, CHDI is reactive and toxic, and must be handled only by trained personnel. It is corrosive to eyes, and a skin sensitizer. All personal exposure should be avoided. Refer to the MSDS before handling Hylene® CHDI.
Packages
DuPont® CHDI is available in cast solid form in 400 lb (881.8 kg) net drums.
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