Covestro represents that, for a period of 6 months (180 days) following the day of shipment as stated in the respective transport documents, the product will meet the specifications or values set forth in chapter "Specification" above, what ever is applicable, provided that the product is stored in full compliance with the storage conditions set forth in and referenced under chapter "storage" above and is otherwise handled appropriately. The lapse of the 6 months (180 days) period does not necessarily mean that the product no longer meets specifications or the set values. However, prior to using said product, Covestro recommends to test such a product if it still meets the specifications or the set values. Covestro does not make any representation regarding the product after the lapse of the 6 months (180 days) period and Covestro shall not be responsible or liable in any way for the product failing to meet specifications or the set values after the lapse of the 6 months (180 days) period.
Product description
Desmodur CD-C is a pale yellow-coloured, modified diphenylmethane 4,4' diisocyanate which is liquid at room temperature. It is used among other things, as the isocyanate component in the production of polyurethane.
Sampling
Moisture access must be prevented when taking product samples.
Specification
| Property | Value | Unit | Standard |
|---|---|---|---|
| NCO content | 28,50 - 29,50 | % by wt. | MDI-01-01 |
| Viscosity at 25° C | 20,0 - 50,0 | mPa.S | MDI-01-02 |
| Hydrolysable chlorine | ≤ 50 | mg/kg | MDI-01-04 |
Typical Values
| Property | Value | Unit | Standard |
|---|---|---|---|
| Density at 25° C | 1.22 ± 0.02 | g/cm³ | DIN 51757 |
| Phenyl isocyanate content | ≤ 10 | ppm | MDI-01-09 |
These values provide general information and are not part of the product specification
Storage
Recommended storage temperature: +15℃ to +30℃
Drums should be protected against strong sunlight and always kept sealed to protect the content from moisture or damp air.
Storage time
Processing
Desmodur CD-C is moisture-sensitive and should therefore always be stored in moisture-tight containers. Prolonged storage at temperatures in excess of 30℃ leads to a deterioration in quality as the product becomes increasingly cloudy due to the deposition of low solubility sediment (dimer formation). If the recommended storage temperature is exceeded for a long period (especially if the temperature of the product rises to above 50℃), or if the recommended shelf life is excessed, a chemical reaction may take place. In addition to a reduction in the NCO content and an increase in viscosity, carbon dioxide in particular may be generated. The resultant increase in pressure may cause the container to swell or burst. Storage at below 15℃ results in crystallization. Desmodur CD-C should under no circumstances be stored in crystallized form as this will promote the formation of insoluble dimers and it will no longer be possible to melt the product completely. Delivered product should be spot–check for crystallization, and cooling to below 15℃ must be avoided. If Desmodur CD-C has been transported or stored below 15℃ for a short time, the material must be re-melted immediately at 60 - 70℃. The melting point and the time required for this should not be exceeded as this also significantly promotes dimer formation. The entire container contents must be melted and homogenized before the container is immediately tightly resealed and its contents cooled down to the recommended storage temperature. There is no risk that quality will be affected should be product have crystallized briefly, but it can be expected that the shelf life will be reduced. The melted material should be used as soon as possible.
Health and Safety Information
Before working with this product, you must read and become familiar with the available information on its risks, proper use, and handling. Information is available in several forms, e.g., in particular in the currently valid safety data sheets and product labels. For further information contact your Covestro representative.
Disclaimer
Contact
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
