Applications
Desmophen® 651 MPA is mainly used as a co-reactant with Desmodur® N 75. This combination yields coatings with excellent lightfastness, gloss retention and weather stability. They also have very good resistance to chemicals and abrasion.
Form supplied
approx. 65 % in 1-methoxypropylacetate-2 (MPA)
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Hazen color value | ≤ 100 | DIN EN 1557 | ||
| Acid value | ≤ 3 | mg KOH/g | DIN EN ISO 2114 | |
| Viscosity at 23 °C | 14,500 ± 3,500 | mPa*s | DIN EN ISO 3219/A.3 | |
| Non-volatile content | (1 g resin/1 ml TCP*/1 h at 125 °C,convection oven) *Disflamoll® TCP (tricresyl phosphate) | 65 ± 1 | % | DIN EN ISO 3251 |
| Hydroxyl content | 5,5 ± 0,4 | % | DIN EN ISO 4629-2 | |
| Water content | ≤ 0,1 | % | DIN 51 777/1 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Equivalent weight | approx. 310 | |||
| Density at 20 °C | approx. 1,11 | g/ml | DIN EN ISO 2811-2 | |
| Flash point | approx. 40 | °C | DIN EN ISO 1523 |
Solubility / thinnability
Desmophen® 651 MPA is soluble in ethyl acetate, methyl ethyl ketone, methyl isobutyl ketone, methoxyhexanone, diacetone alcohol, 1-methoxypropylacetate-2 and methoxybutylacetate. However, the solutions formed must be tested for their storage stability.Butyl acetate is not suitable as the sole solvent.Desmophen® 651 MPA is insoluble in aromatic and aliphatic hydrocarbons although it possible to incorporate a certain proportion of aromatics, e. g. toluene or xylene, as thinners. Only PU grade solvents should be used (< 0.05 % water, free from other reactive impurities).Desmophen® 651 MPA should not be thinned to below a non-volatile content of 30 %. A lower binder content in some solvents may result in turbidity or flocculation.
Compatibility
Generally speaking, Desmophen® 651 MPA is miscible with the Desmodur® and Desmophen® grades listed. However, the combinations must be tested for their compatibility. Desmophen® 651 MPA can be mixed with Desmodur® N 75, N 100, N 3200, IL/ultra IL, L/ultra L and BL 1265 and with Desmophen® 650, 800, 1100 and 1200. It has only limited compatibility with Desmophen® 881 X, 1300, 670 and is incompatible with Desmophen® 1700, 1800. Compatibility with acrylic resins has to be checked.
Storage
- Storage in original sealed Covestro container. - Recommended storage temperature: max. 30 °C. - Protect from moisture, heat and foreign material. General information: The product tends to separate after extended storage. After homogenization, the product can be used with no loss of quality.
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.
