Covestro Bayhydur XP 2451/1 low viscosity water-based PU curing agent

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Type	Based on Hydrophilic aliphatic polyisocyanate of hexamethylene diisocyanate (HDI)
Form of Supply	None Solvent
Purpose	As Hardener component of waterborne two-component coatings and sealers for inorganic substrates and reactive resin (epoxy, polyurethane) surfaces; also as an additive to enhance the performance of waterborne coating systems

Product Specifications*

Features	Value	Measurement unit	Method
Hazencolor value	≤150		DIN EN 1557
Viscosity	about 1000	mPa·s	DIN EN ISO 3219/A.3
23 °CC span>,Dabout4.7	s-1
NCOcontent	about 18.5	%	DIN EN ISO 11909/A
isocyanate monomer	<0.5		DIN EN ISO 10 283

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

Other data**

Features	Value	Measurement unit	Method
Flashpoint	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
Generally, Bayhydur® XP 2451 is compatible with organic solvents such as esters, ether esters, xylene and solvent naphtha 100#. But solubility and compatibility must be tested each time. Solvents of polyurethane grade (less than 0.05 % water) should be used.

Features/Applications
 Because of its hydrophilicity, Bayhydur® XP 2451 is easy to emulsify in the water phase and is mainly used as a crosslinking agent for water-based polyhydric hydroxyl binders (Bayhydrol®). Bayhydur® XP 2451 can also be added to traditional hydroxyl-free dispersions to improve various properties.

Save
The product is sensitive to moisture. When stored in airtight containers at not exceeding 30°C, this product has a shelf life of at least 6 months. However, the viscosity may increase slightly with time.

Safety: Hazard Identification
May cause an allergic reaction by skin contact. This product is harmful to aquatic organisms and may cause long-term adverse effects in the aquatic environment. This product contains isocyanates. The product safety data sheet (953869) should be strictly followed, which includes relevant information such as labeling, transportation and storage, as well as relevant information on product use, product safety and ecology. This product is harmful to aquatic organisms and may cause long-term adverse effects in the aquatic environment.

NOTE
This product is experimental and has not yet been extensively tested. Accordingly, the manufacturer disclaims any warranty regarding the performance of the product in operation and use.

tyle="font-family:宋体">about1.15

g/ml

DIN 53 217/3

*The above values ​​are general information.

Solubility/Dilution
Generally, Bayhydur® XP 2451 is compatible with organic solvents such as esters, ether esters, xylene and solvent naphtha 100#. But solubility and compatibility must be tested each time. Solvents of polyurethane grade (less than 0.05 % water) should be used.

Features/Applications
 Because of its hydrophilicity, Bayhydur® XP 2451 is easy to emulsify in the water phase and is mainly used as a crosslinking agent for water-based polyhydric hydroxyl binders (Bayhydrol®). Bayhydur® XP 2451 can also be added to traditional hydroxyl-free dispersions to improve various properties.

Save
The product is sensitive to moisture. When stored in airtight containers at not exceeding 30°C, this product has a shelf life of at least 6 months. However, the viscosity may increase slightly with time.

Safety: Hazard Identification
May cause an allergic reaction by skin contact. This product is harmful to aquatic organisms and may cause long-term adverse effects in the aquatic environment. This product contains isocyanates. The product safety data sheet (953869) should be strictly followed, which includes relevant information such as labeling, transportation and storage, as well as relevant information on product use, product safety and ecology. This product is harmful to aquatic organisms and may cause long-term adverse effects in the aquatic environment.

NOTE
This product is experimental and has not yet been extensively tested. Accordingly, the manufacturer disclaims any warranty regarding the performance of the product in operation and use.