Desmodur-HDI based curing agent

Covestro Desmodur N3900 HDI based curing agent water-based 2K available to increase film thickness

Features Low-viscosity aliphatic polyisocyanate resins containing hexamethylene diisocyanate (HDI) as curing agents for weather-resistant coating systems

form of supply 100%

Specification

characteristic	Numerical value	Units of measurement	method
NCO content	23.5 ± 0.5	% (by weight)	M105-ISO 11909
Viscosity, 23°C	730 ± 100	mPa·s	M014-ISO 3219/A.3
Color value (Hazen)	≤40		M017-EN1557
HDI monomer	＜0.25	%	M106-ISO 10283

Other data*

characteristic	Numerical value	Units of measurement	method
equivalent	about 179
Flash point	about 203	°C	DIN 22 719
density	about 1.15	g/ml	DIN EN ISO 2811

*This data is general information.

Features/Applications
Desmodur® N3900 is suitable for the preparation of high solids systems for automotive refinish, transportation coatings and plastic coatings.

compatibility
Desmodur® N3900 can be mixed with the following Desmodur® and Desmophen® series: Desmodur® N75, N100, N3200, N3300, N3390, N3400, N3600 and Z4470; most polyester Desmophen® series such as: Desmophen® 670, 680 , VPLS2089 and VPLS2107 and acrylates. Desmodur® N3900 is incompatible with Desmophen® 650 and 651.

Solubility/Dilution
Desmodur® N3900 is compatible with the following solvents: ethyl acetate, butyl acetate, propylene glycol monomethyl ether acetate, acetone, methyl isobutyl ketone, cyclohexanone, toluene, xylene, naphtha® 100 mineral spirits and mixtures thereof solvent. Aliphatic hydrocarbon solvents should not be used. Desmodur® N3900 must not be diluted below 40% solids. Solvents with low binder content should not be stored for long periods of time, as this can lead to cloudiness and precipitation.

store
- Store in original Covestro airtight containers.
- Recommended storage temperature: 0-30°C