Characteristics and Usages of Desmodur N 3300

May 14 , 2025

Desmodur N 3300 is an aliphatic polyisocyanate (HDI trimer) commonly used as a curing component in light-resistant polyurethane coating systems. This article will provide a detailed introduction about the characteristics and uses of Desmodur N 3300.

Excellent Characteristics of Desmodur N 3300

Outstanding weather resistance, can be exposed to high-temperature environments.

Excellent gloss retention, non-yellowing.

Dissolution and Dilution of Desmodur N 3300

Desmodur N 3300 can be diluted with ester, ketone, aromatic solvents such as: ethyl acetate, butyl acetate, propylene glycol ether acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, xylene, etc. It has good compatibility with the above solvents, but the storage stability of the formulated solvent should be tested.

Polyurethane-grade solvents should be used (water content below 0.05%, no hydroxyl or amino active groups). Aliphatic hydrocarbons are not suitable as solvents for Desmodur N 3300.

Desmodur N 3300 should not be diluted to a solids content below 40%. Solutions with lower binder content may become cloudy and precipitate with long-term storage.

Usages of Desmodur N 3300

Desmodur N 3300 is mainly used as a curing agent for light-resistant two-component polyurethane coatings. The prepared coatings have strong chemical resistance, weather resistance, excellent gloss retention, and outstanding mechanical properties.

The self-drying and forced-drying coating systems formulated with Desmodur N 3300 are mainly used in automotive original paints (OEM), car refinishing, transport vehicles, industrial products, and plastic coatings.

Precautions for Desmodur N 3300

Desmodur N 3300 is sensitive to moisture, so it should be stored in sealed original containers. When stored under proper conditions at room temperature, its shelf life is at least 6 months.

Desmodur N 3300 may cause allergic reactions upon skin contact. Therefore, the transportation and storage of Desmodur N 3300 must strictly comply with safety regulations.

Excellent Performance and Precautions of BYK 024

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