Applications
Desmophen® 631 MPA polyester is a coreactant for Desmodur® N 3200 polyisocyanate in two-component polyurethane coatings where higher solids (lower VOC) are needed.These coatings possess outstanding gloss retention, light stability, and good chemical and abrasion resistance. As with any product, use of Desmophen® 631 MPA in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability.
Specification
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Solids | 75 ± 2 | % by wt. | ||
| Water content | ≤ 0,1 | % by wt. | DIN 51777/1 | |
| Viscosity | at 23 °C | 11,000 - 27,800 | mPa*s | DIN EN ISO 3219/A.3 |
| Acid number | max. 3,0 | DIN EN ISO 2114 | ||
| Color value | (Hazen) | ≤ 200 | DIN EN 1557 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Appearance | Yellowish liquid | |||
| Specific gravity | at 25 °C | 1,1 | ||
| Viscosity | at 25 °C | 10,000 - 25,000 | mPa*s | DIN EN ISO 3219/A.3 |
| Equivalent weight | avg. (as supplied) | 267 | DIN EN ISO 2811-2 | |
| Hydroxyl number | 200 - 220 | DIN EN ISO 4629-2 | ||
| OH content | 6,4 | % | DIN EN ISO 4629-2 | |
| Flash point | (Setaflash) | 50 | °C | DIN EN ISO 1523 |
Solubility / thinnability
Desmophen® 631 MPA polyester is soluble in urethane-grade solvents such as ethyl and butyl acetate and in methyl ethyl ketone and methyl isobutyl ketone. It is insoluble in aromatic and aliphatic hydrocarbons. However, aromatic products such as toluene and xylene may be used as diluents in suitable solvent systems.
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.
