Covestro Desmodur® N75 BA light-resistant HDI biuret curing agent, good chemical resistance and flexibility

2023-11-20by admin0


Fat Family polyisocyanate(Hexamethylene diisocyanate biuret)

Form of Supply

about 75% butyl acetate solution


Light resistance Curing agent components for polyurethane coatings




Measurement unit






Non-volatile component content

Desmodur® N75 BA can be used with esters, ketones, and aromatic solvents such as: methoxypropyl acetate, acetone, methyl ethyl ketone , Methyl isobutyl ketone, cyclohexanone, toluene, xylene, No. 100 naphtha solvent and its mixture dilution. Generally have good miscibility with these solvents. However, the storage stability of the prepared solution must be tested. Polyurethane grade solvents should be used (less than 0.05% water, no reactive groups such as hydroxyl or amino groups). Butyl acetate and ethyl acetate are not recommended as the single and main diluent, because the solution with low solid content is unstable. Aliphatic hydrocarbons are not suitable as solvents. Desmodur® N75 BA should not be diluted below 40% solids. Solutions with low binder content may develop turbidity and precipitation after long-term storage.

Desmodur® N75 BA can generally be used with the following products. Namely: Desmodur® N3200, N3300, N3400, N3600 and Desmodur® Z4470 aliphatic polyisocyanates;

Desmodur® L, HL and IL type aromatic polyisocyanates; Desmophen® 651 and 670 type polyester polyols; Desmophen® A type polyacrylates; Desmophen® 1380BT type polyethers Polyol. However, the compatibility of the prepared solutions must be tested.

Desmodur® N75 BA is mainly used as a curing agent component of lightfast two-component polyurethane coatings with good chemical resistance Good quality, weather resistance, excellent gloss retention and excellent mechanical properties. Ideal co-reactants are polyacrylate or polyester polyols. Coating systems formulated with Desmodur® N75 are suitable for self-drying and oven-drying applications for automotive and industrial finishes such as wood, furniture, plastic finishing and corrosion protection.

Desmodur® N75 is sensitive to moisture and should be stored in the sealed original container. When stored under proper conditions at room temperature, this product has a shelf life of at least 6 months.

Safety: Hazard Identification
Flammable. Skin contact may cause a sensitization reaction. Repeated exposure to this product can cause dry, cracked skin. Product vapor may cause drowsiness, dizziness. Contains isocyanates. The product safety data sheet must be strictly followed, which includes relevant information such as labels, transportation and storage, as well as relevant information on product use, product safety and ecology.

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