Desmodur-HDI based curing agent

Covestro Desmodur N3580 BA (XP 2679) Ultra Fast Drying PU Hardener HDI Based

type	Aliphatic polyisocyanate (HDI allophanate trimer)
form of supply	Combining Desmophen® grades with lightfast, abrasion resistant polyurethane coating systems
use	About 80% in butyl acetate

Specification

characteristic	Numerical value	Units of measurement	method
NCO content	15.4±0.3	%	M105-ISO11909
Non-volatile components (2.2 g/120 min/100°C)	80±2	％	M020-ISO3251
Viscosity@23°C	500±200	mPa·s	M014-ISO3219/A.3
Hazen color value	≤100		M017-EN1557
Monomer HDI content	<0.20	%	M106-ISO10283

Other data*

characteristic	Numerical value	Units of measurement	method
equivalent	about 273
Flash point	31.5	°C	DINENISO13736
Density@20°C	about 1.1	g/ml	DIN51757

*This data is general information and is not part of the product specification.

Solubility / dilution
Desmodur® N3580 BA can be diluted with esters, ketones, aromatic hydrocarbons such as ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, methyl isobutyl ketone, cyclohexanone, toluene, xylene, stone Naphtha and mixtures thereof. Generally good miscibility with the listed solvents, but the storage stability of the prepared solutions must be tested. PU grade solvents (less than 0.05% water content) should be used. These solvents should not contain reactive groups like hydroxyl and amino groups. Aromatic hydrocarbons are not suitable as solvents. Polar and non-polar solutions with <65% non-volatile content are recommended as diluents. Desmodur® eco N7300 should not be diluted below 40% solids by weight. Prolonged storage of solvents with low binder content may result in cloudiness and precipitation.

compatibility
Desmodur® N3580BA can usually be mixed with the following products: aliphatic isocyanates such as Desmodur® N100, N75, N3200, N3390, N3400, N3600, N3800, XP 2410, Z4470 and some polyacrylates. However, the compatibility of the ingredients in the formulation should be tested frequently.

Features/Applications
Desmodur® N3580 BA is used in combination with suitable Desmophen® products for the preparation of light-, weather- and scratch-resistant two-component polyurethane coatings. The main areas of application are topcoats in automotive OEM and plastic coatings.

store
- Store in original Covestro airtight containers.
- Recommended storage temperature: 0-30 ℃.
- Avoid moisture, heat and foreign substances.

General Information: This product is moisture sensitive. Storage at high temperature will darken the color and increase the viscosity of the product.

storage time
Provided the product is stored in full compliance with the requirements in the "Storage" clause above and handled properly, the product meets the specifications stated in the "Specifications or Characteristic Values" clause above for a period of 9 months from the date of shipment stated on the shipping document or characteristic value (as applicable). Exceeding the above 9-month period does not mean that a product no longer meets the specifications or the values set in the characteristic values. However, it is recommended that products older than 9 months from the date of shipment be tested prior to use to confirm that they still meet the specifications or values set in the characteristic values. The manufacturer makes no commitments for products older than 9 months from the date of shipment, and does not assume any responsibility or liability for non-conformance to specifications or set values in characteristic values.