Overview
Desmodur N 75 MPA/X is an aliphatic polyisocyanate hardener used as the hardener component in two-component polyurethane coating systems. Formulators specify it where lightfastness, chemical resistance, weathering resistance, and gloss retention are required alongside strong mechanical performance. As an aliphatic (rather than aromatic) polyisocyanate, this hardener chemistry is generally selected specifically for its resistance to UV yellowing, which matters for coatings that need to hold their appearance in outdoor or high-light-exposure conditions. As one of the recommended international brand products in our auxiliary agent range, this hardener is supplied with supply chain resource support for coating formulators sourcing PU hardener systems for automotive, industrial, and wood finishing applications.
Key Properties
- Aliphatic polyisocyanate hardener for two-component polyurethane coatings
- High resistance to chemicals and weathering
- Very good gloss retention in finished coatings
- Outstanding mechanical properties when paired with compatible polyols
- Compatible with a defined range of PU-grade solvents
Solubility and Thinning Guidance for Desmodur N 75 MPA/X
Desmodur N 75 MPA/X can be thinned with esters, ketones, and aromatic hydrocarbons such as ethyl acetate, butyl acetate, methoxypropylacetate, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, toluene, xylene, solvent naphtha 100, and mixtures of these solvents. It generally shows good compatibility with the solvents listed, though any resulting solution should be tested for storage stability before use in production. Only PU-grade solvents should be used, meaning a maximum of 0.05% water content and the absence of reactive groups such as hydroxyl or amino groups. Aliphatic hydrocarbons are not suitable as solvents for this hardener. Formulators should not thin this product below a solids content of 40%, since prolonged storage of a solution with a lower binder content can lead to turbidity and sedimentation.
Applications
Desmodur N 75 MPA/X is used primarily as the hardener component for lightfast two-component polyurethane coatings. Preferred co-reactants are polyacrylate or polyester polyols, and formulators typically select this hardener when a system needs high resistance to chemicals and weathering combined with very good gloss retention. The main applications for systems based on this hardener are air- and force-drying coatings for:
- Automotive and industrial finishing
- Wood and furniture coatings
- Plastics coatings
- Corrosion protection systems
These applications align with our Paints & Coatings and Automotive & Transportation industry categories, where two-component PU coating systems are widely specified for durability and appearance retention.
Related Grades
For coating formulations that require higher solids content and application viscosity flexibility, buyers can also consider the Desmodur N 3390 BA HDI trimer, which offers a higher non-volatile content than Desmodur N 75 MPA/X for higher-solids 2K polyurethane coating systems. Comparing both grades against your target solids content and application viscosity can help narrow down the right hardener for a specific coating line. Since both grades are aliphatic polyisocyanates from the same product family, formulators switching between them typically retain similar weathering and gloss-retention characteristics while adjusting solids and viscosity to match the application method, whether spray, roller, or dip coating.
Where to Source This Product
Thousands Chemicals connects coating formulators and industrial finishers with Desmodur N 75 MPA/X and related auxiliary agent products through our digital B2B marketplace. Our team can help confirm packaging, lead times, and technical documentation for your target application and order volume.
FAQ
What is Desmodur N 75 MPA/X used for?
It is used as the hardener component in two-component polyurethane coating systems, primarily for automotive, industrial, wood, furniture, plastics, and corrosion-protection finishing where chemical resistance, weathering resistance, and gloss retention are required.
Which solvents are suitable for thinning this hardener?
Esters, ketones, and aromatic hydrocarbons such as ethyl acetate, butyl acetate, methoxypropylacetate, acetone, MEK, MIBK, cyclohexanone, toluene, xylene, and solvent naphtha 100 are generally compatible. Only PU-grade solvents should be used, and aliphatic hydrocarbons are not suitable.
Is there a minimum solids content when thinning?
Yes, the product should not be thinned below a solids content of 40%. Prolonged storage below this level can result in turbidity and sedimentation.
What co-reactants work with this hardener?
Polyacrylate or polyester polyols are the preferred co-reactants for building two-component polyurethane coating systems with this hardener.
Can you provide technical documentation and bulk pricing?
Yes, technical data sheets and SDS documentation are available on request, and our team can provide bulk pricing and lead times based on your target volume and delivery location.
How should this hardener be stored before use?
Isocyanate hardeners such as this one should be kept sealed in their original containers, protected from moisture, since exposure to humidity can trigger unwanted reaction and affect performance. Always follow the storage guidance on the current technical data sheet and SDS.
Get a Quote for Desmodur N 75 MPA/X
Contact our team for a quote, technical data sheet, or SDS for Desmodur N 75 MPA/X. We support bulk supply and global shipping for coating formulators and industrial finishers.
