Covestro Bayhydur 305 waterborne HDI polyisocyanate easy to mix high gloss

Type	Hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate
Form of Supply	None Solvent-based
Purpose	Curing agent for waterborne two-component polyurethane coating

Product Specifications

Features	Value	Measurement unit	Method
NCOcontent	16.2 ±0.4	%	DIN EN ISO 11 909
Viscosity@ 23℃	6,500 ±1,500	mPa ·s	DIN EN ISO 3219
Hazencolor value span>	≤ 150		DIN EN 1557
isocyanate monomer content	< 0.15	% (by weight)	DIN 55 956

Other Data*

Features	Value	Measurement unit	Method
Density	about1.16	g/cm3	DIN 53 217
Flashpoint	about230	℃	DIN EN 53 213

Solubility/Dilution
Bayhydur 305 generally has good compatibility with organic solvents such as: esters, ether esters, xylene and solvent naphtha 100. However, in any case the solubility/miscibility of the prepared solution must be tested. Polyurethane grade solvents should be used (moisture content <0.05%)

Features/Applications
This product is a crosslinking agent for water-based paint. It is especially suitable for use in the civilian field where it can be mixed and used immediately after shaking or manual stirring.
Even in the pre-diluted condition, the coating film is still transparent and bright. The mixing ratio of mill base to curing agent is usually 10:1.

enter”>g/cm3

DIN 53 217

Flashpoint

about230

℃

DIN EN 53 213