Desmodur-TDI based curing agent

Covestro Desmodur L75 A/C TDI Hardener

type	Aromatic polyisocyanates of the TDI type
characteristic	Desmodur L 75(A) is Desmodur L 75(C) without added stabilizers
form of supply	75% in ethyl acetate
use	Polyurethane coating hardener, mixed with various Desmophen resins or other base-containing resins for formulating self-drying two-pack polyurethane coatings

Product Specifications

characteristic	Numerical value	Units of measurement	method
Isocyanate content	13.3 ± 0.4	％	DIN EN ISO 11 909A
Nonvolatile content	75 ± 2	％	DIN EN ISO 3215
Viscosity, 23℃	1600 ± 400	mPa·s	DIN EN ISO 3219
Iodine color value	≤ 0.5%		DIN EN 1557
Free TDI monomer content	< 0.5	% (by weight)	DIN 55 956

Other data*

characteristic	Numerical value	Units of measurement	method
equivalent	315
density	1.17	g/ml	DIN 51757
Flash point	5	℃	DIN 51 755/2

*The above values are general information.

Solubility / Dilution
Generally speaking, Desmodo L75 has good compatibility with the following solvents, but the storage stability of its diluted solutions must be tested. It is soluble in ester solvents such as ethyl acetate, butyl acetate, propylene glycol methyl ether acetate, toluene, xylene, Slovesso® 100 and Slovesso® A solvents, however it is not soluble in petroleum in solvent oil.
Alcoholic solvents will react with Desmodur L75 and therefore cannot be used as diluents. Long-term storage of low solids resin solutions may cause turbidity and precipitation. Polyurethane grade solvents (less than 0.05% water content) must be used, and the solvents must not contain active ingredients.

compatibility
Desmodur L75 is compatible with many polyesters, polyethers and polyacrylates, as well as with various Desmodur curing agents.

Application
Coatings formulated with Desmodo L75 for the coating of furniture, floors, metal, paper, plastic and mineral substrates.

storage
Desmodur L75 is sensitive to moisture. Therefore, it needs to be stored in the original packaging drum that is completely original and sealed. The recommended storage temperature is 0°C to 30°C. Storage at high temperature will cause the viscosity to rise. Desmodo L75 is stable for at least six months if stored under appropriate conditions.

Safety

Special care must be taken when handling this product as it contains solvents.
This product is flammable, so it must be kept away from fire. Measures to prevent electrostatic adsorption must be taken. At the same time, the current national laws and regulations and recommended measures for dealing with flammable and explosive materials should also be noted and followed.
It is recommended to wear safety goggles and protective gloves to avoid skin and eye contact with this product or inhalation of its vapor. When spraying, respiratory organs must be protected from spray damage, so wear a respirator.