Desmodur-HDI based curing agent

Covestro Desmodur N3300 HDI trimer curing agent Standard lightfast PU curing agent

type	Aliphatic polyisocyanate (HDI trimer)
form of supply	Solvent free
use	Used as a curing agent component in lightfast polyurethane coating systems

Product Specifications

characteristic	Numerical value	Units of measurement	method
NCO content	21.8 ± 0.3	%	DIN EN ISO 11909
Viscosity, 23°C	2500 ± 1000	mPa·s	DIN EN ISO 3219/A.3
Color value (Hazen)	≤ 40		DIN EN 1557
HDI monomer content	≤ 0.15	%	DIN EN ISO 10 283

Other data*

characteristic	Numerical value	Units of measurement	method
Viscosity, 25°C	about 2500	mPa·s	DIN EN ISO 3219/A.3
equivalent	about 193
Density, 20°C	about 1.16	g/ml	DIN EN ISO 2811
Flash point	about 158	°C	DIN 22 719

*The above values are general information and are not part of the product specification.

Solubility / dilution
Desmodur® N3300 can be used with esters, ketones, aromatic hydrocarbon solvents such as: ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, Dilute with xylene, 100# solvent naphtha and its mixture. Generally have good miscibility with the above solvents. However, the storage stability of the resulting solutions must be tested. Polyurethane grade solvents should be used (less than 0.05 % water, no reactive groups such as hydroxyl or amino groups). Aliphatic hydrocarbons are not suitable solvents. Desmodur® N3300 should not be diluted below 40% solids. Solutions with low binder content may experience turbidity and precipitation after prolonged storage.

compatibility
Desmodur® N3300 can generally be used with the following products. Namely: Desmodur® N100, N75, N3200, N3400, N3600 and Desmodur® Z4470 aliphatic polyisocyanates; Desmodur® L, HL and IL aromatic polyisocyanates; Desmophen® 670 polyester polyols; Desmophen® A polyisocyanates Acrylate. However, the compatibility of the prepared solution must be tested. Desmodur® N3300 is not compatible with branched polyester polyols such as Desmophen® 651 or polyether polyols such as Desmophen® 1380 BT.

Features/Applications
Desmodur® N3300 is mainly used as a curing agent for lightfast two-component polyurethane coatings. The coatings prepared have strong chemical and weather resistance, excellent gloss retention and excellent mechanical properties. The best co-reactants are polyacrylates or polyester polyols The main application areas for Desmodur® N3300-based self-drying and force-drying coating systems are OEM, automotive refinish, transportation, industrial and plastics of finishing.

store
Desmodur® N3300 is sensitive to moisture and should therefore be stored in its original sealed container. When properly stored at room temperature, this product has a shelf life of at least 6 months.

Safety: Hazard Identification
Skin contact may cause allergic reactions. Safety data sheets must be strictly adhered to containing isocyanates. It includes information on labelling, transportation and storage, as well as information on product use, product safety and ecology.