Bayhydur-waterborne PU curing agent

Covestro Bayhydur XP 2451/1 low viscosity waterborne PU hardener

type	Hydrophilic aliphatic polyisocyanates based on hexamethylene diisocyanate (HDI)
form of supply	Solvent free
use	As a curing agent component for 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	about 1000	mPa·s	DIN EN ISO 3219/A.3
23 °C, D about 4.7	s-1
NCO content	约18.5	%	DIN EN ISO 11909/A
Isocyanate Monomer	<0.5		DIN EN ISO 10 283

*The above values are provisional values. The product specifications that should be followed are subject to the final published information.

Other data**

characteristic	Numerical value	Units of measurement	Units of measurement
Flash point	about 184	°C	DIN EN 22 719
Density, 20°C	about 1.15	g/ml	DIN 53 217/3

*The above values are general information.

Solubility / dilution
In general, Bayhydur® XP 2451 is compatible with organic solvents such as esters, ether esters, xylenes and solvent naphtha 100#. However, solubility and compatibility must be checked each time. Polyurethane grade solvents (less than 0.05 % moisture) should be used.

Features/Applications

Due to its hydrophilic nature, Bayhydur® XP 2451 is easy to emulsify in the water phase, and is mainly used as a cross-linking agent for water-based polyhydroxyl binders (Bayhydrol®). Bayhydur® XP 2451 can also be added to traditional hydroxyl-free dispersions to improve all aspects of their properties.

Store
This product is sensitive to moisture. This product has a shelf life of at least 6 months when stored in airtight containers at temperatures not exceeding 30°C. However, the viscosity may increase slightly over time.

Safety: Hazard Identification
Skin contact may cause allergic reactions. This product is harmful to aquatic life and may cause long-term adverse effects in the aquatic environment. This product contains isocyanates. Product Safety Data Sheet (953869) should be strictly followed, which includes information on labelling, transportation and storage, as well as information on product use, product safety and ecology. This product is harmful to aquatic life and may cause long-term adverse effects in the aquatic environment.

Notice
This product is an experimental product and has not yet gained extensive experience. Therefore, the manufacturer makes no guarantees regarding the performance of the product in operation and use.