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.
Product description
Aromatic polyisocyanate based on diphenylmethane diisocyanate.As a hardener primarily for Desmolith® systems.
Applications
Desmodur® XP 2551 is combined with, for example, Desmophen® 5028 GT, 1380 BT or castor oil based polyols. Depending on the Desmophen® product used, the coatings yielded can be varied from hard to flexible.It is necessary to add water scavengers such as molecular sieve paste® 3 Å to the polyol component to prevent the undesired reaction of Desmodur® XP 2551 with water.Systems formulated with Desmodur® XP 2551 are suitable for coating concrete, asphalt, fibrous cement and plastics.
Form supplied
Brown, solvent-free, low-viscosity liquid
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| NCO | 32 ± 0,4 | % | MDI-01-01 | |
| Viscosity | at 25 °C | 65 ± 10 | mPa*s | MDI-01-02 |
| Acidity | (HCI) | 415 ± 65 | mg/kg | MDI-01-03 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| NCO equivalentweight | approx. 131 | |||
| Flash point | approx. 220 | °C | DIN EN ISO 2719 | |
| Density at 20 °C | approx. 1,23 | g/ml | DIN 51 757 |
Compatibility
Desmodur® XP 2551 is – in some cases after a brief pre-reaction – compatible with numerous hydroxyl-bearing polyesters and polyethers. In case of doubt, compatibility should be tested by the user.
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 can result in increased viscosity whereas storage at lower temperatures can result in the formation of crystalline deposits.
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
Disclaimer
Contact
Please use our contact form or contact us directly by sending an e-mail to technical-datasheets@cx.covestro.com .
