Product introduction
       Aliphatic polyisocyanate (HDI uretdione);
Used as a curing agent component in weather-resistant polyurethane coating systems

 Specifications

 Other data*

*This data is general information and is not part of the product specification.

  Features/Applications
      Desmodur® N3400 is mainly used as a reactive diluent or curing agent for weather-resistant two-component polyurethane coatings, and as a resin for one-component moisture-curing polyurethane coatings. In two-component systems Desmodur® N3400 is usually mixed with other aliphatic polyisocyanates such as Desmodur® N3200, ultra N3300, N3600 and Z4470. The ideal co-reactant is hydroxy polyacrylate. In one-pack polyurethane systems, Desmodur® N3400 can be used as a single resin or mixed with other polyisocyanates, such as Desmodur® N3200 and ultra N3300. Due to its low viscosity, Desmodur® N3400 can also be used as a curing agent in waterborne two-component polyurethane coatings.

  compatibility  
In general, Desmodur® N3400 can be mixed with the following products: aliphatic polyisocyanates such as Desmodur® N100, N75, N3200, ultra N3300, N3600 and Z4470; aromatic polyisocyanates such as Desmodur® L/ ultra L, HL and IL/ ultra IL; Hydroxy polyesters such as Desmophen® 670; hydroxy acrylates such as Desmophen® A series products. However, it is best to perform a compatibility test before each mix. Desmodur® N3400 has poor compatibility with branched hydroxyl polyesters such as Desmophen® 651.

Solubility/Dilution
Desmodur® N3400 can be diluted with solvents such as esters, ketones and aromatic hydrocarbons such as ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, Toluene, No. 100 mineral spirits and mixtures thereof. In general, it has good compatibility with the various solvents listed, but it is still necessary to test the storage stability of its diluted solutions. Polyurethane grade solvents should be used (less than 0.05% water content and should not contain reactive groups such as hydroxyl or amino groups in the solvent). Aliphatic hydrocarbons are not suitable as solvents.
Desmodur® N3400 cannot be diluted below 40% solids. Long-term storage of low resin content solutions may cause turbidity and precipitation.

store
- Store in original Covestro airtight containers.
- Recommended storage temperature: 0-30℃.
- Avoid moisture, heat and foreign substances.
General Information: This product is sensitive to moisture, and storage at high temperature (greater than or equal to 30°C) will result in darker color and increased viscosity.

storage time
Covestro declares that the product complies with the above "specification or characteristic values" for a period of 6 months from the date of shipment stated on the shipping document, provided that the product is stored in full compliance with the requirements in the "Storage" clause above and handled properly Specifications or characteristic values ​​stated in the Terms (as applicable). The fact that a product exceeds the 6-month period above does not mean that it no longer meets the specifications or the values ​​set in the characteristic values. However, Covestro recommends that products older than 6 months from the date of shipment be tested before use to confirm that they still meet the specifications or set values ​​in the characteristic values. Covestro makes no commitments for products older than 6 months from the date of shipment, and accepts no responsibility or liability for non-conformance to specifications or set values ​​in characteristic values.