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.
Applications
Desmodur® N 3200A is used primarily as the hardener component for lightfast two-component polyurethane coatings with high resistance to chemicals and weathering, very good gloss retention and outstanding mechanical properties. Preferred co-reactants are polyacrylate or polyester polyols.
The main applications for systems based on Desmodur® N 3200A are as air- and force-drying coatings for automotive and industrial finishing, for wood, furniture and plastics and for corrosion protection.
On account of its low viscosity, Desmodur® N 3200A is particularly suitable for the formulation of high-solids and coating systems, e.g. for floors.
As with any product, use of Desmodur® N 3200A crosslinker 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 |
|---|---|---|---|---|
| NCO content | 22.5 - 23.5 | % | M105 - ISO 11909 | |
| Monomer content | ≤ 0.70 | % | M106 - ISO 10283 | |
| Dynamic viscosity | 25 °C | 1,300 - 3,000 | mPa·s | M014 - ISO 3219/A.3 |
| Color | Hazen | ≤ 80 | M017 - EN 1557 |
Typical Values
| Property | Test Condition | Value | Unit | Standard |
|---|---|---|---|---|
| Color | colourless to yellowish | |||
| Flash point | 1,013 hPa | 169 | °C | DIN EN 22719 |
Solubility / thinnability
Desmodur® N 3200A can be thinned with esters, ketones and aromatic hydrocarbons such as ethyl acetate, butyl acetate, methoxypropylacetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, xylene, solvent naphtha 100 and mixtures thereof.
Generally speaking, it has good compatibility with the solvents listed. However, the solutions formed must be tested for their storage stability. Only PU grade solvents should be used (maximum 0.05% water, absence of reactive groups such as hydroxyl or amino groups). Aliphatic hydrocarbons are unsuitable as solvents.
Desmodur® N 3200A should not be thinned to below a solids content of 40%. Prolonged storage of a solution with a lower binder content may result in turbidity and sedimentation.
Compatibility
Generally speaking, Desmodur® N 3200A can be mixed with the following products: aliphatic polyisocyanates such as Desmodur N 100A, N 75A, N 3300A, N 3400, N 3600 and Desmodur Z 4470; aromatic polyisocyanates such as Desmodur L, HL and IL; polyester polyols; polyacrylates; and polyether polyols. However, the compatibility of the combinations used should always be tested.
Storage
Desmodur® N 3200A should be stored in tightly sealed original containers and protected from moisture, heat, and foreign materials. The product is sensitive to moisture. Storage at higher temperatures will result in increase of color and viscosity. Storage at significant lower temperatures will result in solidification. This solidification is reversible by briefly heating the product without adversely affecting the quality of the product. Recommended storage temperature is 5º-25ºC.
Storage time
Important
Desmodur® is a registered trademark of the Covestro Group.
