Bayhydur-waterborne PU curing agent

Covestro Bayhydur XP 2547 Hydrophilic HDI polyisocyanate Low viscosity High chemical resistance

type	Hydrophilic aliphatic polyisocyanates based on hexamethylene diisocyanate (HDI)
form of supply	Solvent free
use	As a curing agent component of waterborne two-component coatings and sealers, for inorganic base layers and reactive resin (epoxy, polyurethane) surfaces; also as an additive to enhance the performance of waterborne coating systems.

Product Specifications

characteristic	Numerical value	Units of measurement	method
Hazen color value	≤ 150		DIN EN 1557
Viscosity, 23°C	570-730	mPa·s	DIN EN ISO 3219/A.3
NCO content	22.5±0.5	%	DIN EN ISO 11 909
Free HDI monomer content	＜0.5	% by weight	DIN 55 956

Other data*

characteristic	Numerical value	Units of measurement	method
Density, 20°C	about 1.15	g/ml	DIN EN ISO 2811
Flash point	about 185	°C	DIN EN 22 719

*The above values are general information.

Solubility / dilution
Generally, this product has good compatibility with organic solvents such as esters, ether esters, xylene and solvent naphtha 100. However, solubility and compatibility must be checked each time. Polyurethane grade solvents (less than 0.05% water content) should be used.

Features/Applications
Because Bayhydur® XP 2547 is hydrophilic, it is easy to emulsify in the water phase, and it is mainly used as a cross-linking agent for water-based hydroxy polyol binders (Bayhydrol®). Bayhydur® XP 2547 can also be added to conventional hydroxyl-free dispersions to improve all aspects of their properties.

store
This product is moisture sensitive. This product has a shelf life of at least 6 months when properly stored in an airtight container not exceeding 30°C. Viscosity may increase slightly over time.

Safety: Hazard Identification
Contains isocyanates, skin contact may cause allergic reactions. Product Safety Data Sheet (492659) should be strictly followed. It includes information on labelling, transportation and storage, as well as information on product use, product safety and ecology.