Desmophen - Polyester

Covestro Desmophen 1652 Linear polyester polyol for flexible polyurethane coating formulations

type	Linear hydroxy polyester
form of supply	Solvent-free liquid polyols
use	Formulating Flexible Polyurethane Coatings

Specification

characteristic	Numerical value	Units of measurement	method
Color value (Hazen)	≤ 150		DIN EN 1557
Acid value	≤ 4	mgKOH/g	DIN EN ISO 2114
Viscosity@23°C	11,000 ± 2,000	mPa·s	DIN EN ISO 3219
Hydroxyl content	1.6 ± 0.2	%	ISO 6796
water content	≤ 0.1	%	DIN 51 777/1

Other data*

characteristic	Numerical value	Units of measurement	method
equivalent	about 1060
Density@20℃	about 1.17	g/ml	DIN EN ISO 2811-2
Flash point	about 218	°C	DIN EN ISO 2719
pour point	about 12	°C	DIN ISO 3016

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

Solubility / dilution
Desmophen® 1652 can be diluted with esters and ketones such as: ethyl acetate, butyl acetate, methyl ethyl ketone and methyl isobutyl ketone, 1-methoxypropyl acetate-2, cyclohexanone and acetone. However, the storage stability of the formulated solutions must be tested. Solutions with low binder content can cause cloudiness and precipitation after prolonged storage. Polyurethane grade solvents should be used (water content < 0.05%, no other reactive impurities).

compatibility
Desmophen® 1652 can be mixed with Desmophen® 800, 1100, 1200 and Desmodur® L, HL.
Before each mixing, it is recommended to test its compatibility.

Features/Applications
Desmophen® 1652 is combined with Desmodur® VL to formulate flexible solvent-free coatings and seal coats. When mixed with Desmodur® L or HL, a dry film is formed only with excessive crosslinking.

store
Desmophen® 1652 is slightly hygroscopic. The product is stable for at least 6 months when stored below 30°C in the original, sealed container.
This product tends to be cloudy at low temperatures. In long-term storage under heating or normal temperature, the product will become clear and can be used without any negative impact on product quality.