Bayhydur-waterborne PU curing agent

Covestro Bayhydur 305 Waterborne HDI Polyisocyanate Easy Mixing High Gloss More about this source textSource text required for additional translation

type	Hydrophilic aliphatic polyisocyanates based on hexamethylene diisocyanate
form of supply	Solvent-free
use	Curing agent for waterborne two-component polyurethane coatings

Product Specifications

characteristic	Numerical value	Units of measurement	method
NCO content	16.2±0.4	％	DIN EN ISO 11 909
Viscosity @ 23℃	6,500±1,500	mPa·s	DIN EN ISO 3219
Hazen color value	≤150		DIN EN 1557
Isocyanate monomer content	<0.15	% (by weight)	DIN 55 956

Other data*

characteristic	Numerical value	Units of measurement	method
density	about 1.16	g/cm3	DIN 53 217
Flash point	about 230	℃	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 previously prepared solution must be tested. Polyurethane grade solvents should be used (moisture content <0.05%)

Features/Applications
This product is a cross-linking agent for water-based coatings. It is particularly suitable for use in civil applications where it is ready to mix by shaking or hand stirring.
Even in pre-diluted conditions, the coating film is still transparent and bright. The mixing ratio of grinding base to curing agent is usually 10:1.