Covestro Bayhydur 305 water-based HDI polyisocyanate easy to mix high gloss

Type	Hydrophilic aliphatic polyisocyanate based on hexamethylene diisocyanate
Supply form	None Solvent type
Purpose	Curing agent for water-based two-component polyurethane coatings

Product Specifications

Features	Value	Measurement units	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	≤ 150		DIN EN 1557
Isocyanates Monomer content	< 0.15	% (by weight)	DIN 55 956

Other data*

Features	Value	Measurement units	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 (moisture content <0.05%) should be used

Features/Applications
This product is a cross-linking agent for water-based coatings. It is particularly suitable for use in civil fields where it can be mixed and used immediately after vibration or manual stirring.
Even under pre-diluted conditions, the coating is still transparent and bright. The mixing ratio of grinding base to curing agent is usually 10:1.

enter">g/cm3

DIN 53 217

Flashpoint

about230

℃

DIN EN 53 213