Polyisocyanate based on diphenylmethane diisocyanate.In combination with polyols to formulate two-component coatings and sealing compounds and to manufacture prepolymers.
Product description
Form supplied
yellow, solvent-free liquid
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| NCO | 24,5 ± 0,5 | % | MDI-01-01 | |
| Viscosity | 25 °C | 280 ± 80 | mPa*s | MDI-01-02 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Flash point | approx. 195 | °C | DIN EN ISO 2719 | |
| Density | at 20 °C | approx. 1,21 | g/ml | DIN EN ISO 2811-2 |
| Equivalent weight | 173 |
Compatibility
Generally speaking, Desmodur® VH 20 N has good compatibility with most polyester, polyether and polyether ester polyols as well as with many flexibilisers and liquid extender resins. In cases of doubt, compatibility tests should be carried out.
Storage
- Storage in original sealed Covestro container. - Recommended storage temperature: 10 - 30 °C. - Protect from moisture, heat and foreign material. General information: The product is sensitive to moisture and should therefore be stored in its sealed original containers. Storage at higher temperatures may result in an increase in viscosity and at lower temperatures in the formation of crystalline deposits. The crystals can be remelted by heating the product gently. Warning If the recommended storage temperature is exceeded for a long period (especially if the temperature of the product rises to above 50 °C), or if the recommended shelf life is exceeded, or if the product comes in contact with water or bases such as amines, alkalis or metal compounds, 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 containers to swell or burst. Consequently, if the product is mixed with other components or processed into a prepolymer, it is advisable to check the shelf life of the mixture or prepolymer.
Storage time
Covestro represents that, for a period of six months following the day of shipment as stated in the respective transport documents, the product will meet the specifications or values set forth in section "specifications or characteristic data" above, what ever is applicable, provided that the product is stored in full compliance with the storage conditions set forth in and referenced under section "storage" above and is otherwise handled appropriately.The lapse of the six months 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 six months 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 six months period.
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 .
