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Ensinger PEI
Covestro Bayhydrol® A 242 Polyurethane Coating
Categories: Polymer; Thermoplastic; Adhesives, Sealants, and Coatings; Thermoset; Polyurethane, TS

Material Notes: Bayhydrol A 242 is a water-thinnable polyacrylic resin containing hydroxyl groups. As a co-reactant for Bayhydur® and Desmodur® N polyisocyanates in the formulation of aqueous two-component polyurethane systems for various applications by brush, roller or spray.

Properties / Applications: Bayhydrol A 242 is a water-thinnable hydroxyfunctional polyacrylic resin with emulsifying properties. It is neutralised with ammonia. Given the special composition of this product, both hydrophilic polyisocyanates, e.g. Bayhydur® 302, and hydrophobic grades, such as Desmodur® N 3400 and others, are suitable co-reactants. The resultant water-thinnable two-component system cures to yield a polyurethane film with good general properties. Only a small-scale polyurea reaction takes place.
Suitable auxiliaries include:

  • Thickener to adjust the formulation to the optimum application viscosity
  • De-aeration agent and antifoam
  • Conservation agent
The amounts required should be determined empirically on the basis of the polyisocyanate used and the intended application. As with any product, use of Bayhydrol A 242 in a given application must be tested (including but not limited to field testing) in advance by the user to determine suitability.

Information provided by Covestro

Available Properties
  • Specific Gravity
  • Volatiles, 1g/1h/125°C
  • pH, 10% in demineralized water
  • Viscosity, D=approx. 165s-1
Property Data

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Manufacturer Notes:
Covestro Deutschland AG, Bayer MaterialScience

Category Notes

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