N3900 Aliphatic polyisocyanate HDI trimer

^{1. Characterization}

Aliphatic polyisocyanate (HDI trimer).

As the hardener component for lightfast polyurethane coating systems.

2. Properties / Applications

Desmodur^® N 3900 is used to formulate high-solids systems for automotive refinishing, transportation coating, and plastics coating.

^{3. Solubility / thinnability}

^{Desmodur® N 3900 is compatible with the following solvents: ethyl acetate, butyl acetate, PMA, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, xylene, solvent naphtha® 100 and mixtures thereof. Aliphatic hydrocarbons are not suitable as solvents.}

^{Desmodur® N 3900 should not be thinned below a solids content of 40 % by wt. Prolonged solution storage with a lower solids content may result in turbidity and sedimentation.}

^{4. Specification}

^{5. Compatibility}

^{Desmodur® N 3900 can be mixed with the following Desmodur® and Desmophen® products: Desmodur® N 75, N 100, N 3200, N 3300, N 3390, N 3400, N 3600, and Z 4470;}

^{most polyester-based Desmophen® products such as Desmophen® 670, 680, VP LS 2971, VP LS 2089, VP LS 2107, and with polyacrylates. It is incompatible with Desmophen® 650 and 651.}

6. Properties / Applications

Desmodur^® N 3900 is used to formulate high-solids systems for automotive refinishing, transportation coating, and plastics coating.

^{7. Storage and storage time}

^{- 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 tightly sealed containers. Storage at elevated temperatures will lead to an increase in viscosity and a reduction of the NCO content.}

^{Covestro represents that, for nine months following the day of shipment as stated in the respective transport documents, the product will meet the specifications or values outlined in section "specifications or characteristic data" above, whatever is applicable, provided that the product is stored in full compliance with the storage conditions outlined in and referenced under section "storage" above and is otherwise handled appropriately.}

^{The lapse of nine months does not necessarily mean that the product no longer meets specifications or the set values. Covestro does not make any representation regarding the product after the lapse of nine months. Co vestro shall not be responsible or liable in any way for the development failing to meet specifications or the set values after the reverse of the nine months}. However, before using said product, Covestro recommends totestinguch a product to see if it still meets the specifications or the set values.

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