2-hydroxypropyl acrylate

2-Hydroxypropyl acrylate (CAS 2918-23-2), abbreviated HPA, is a reactive hydroxyl-functional monomer used in UV-curable and free-radical polymerization systems.

Where is 2-hydroxypropyl acrylate used?

• UV-curable coatings and inks: reactive diluent that reduces viscosity while contributing to the crosslinked structure
• Adhesives and sealants: hydroxyl functionality in acrylic backbones for substrate adhesion and cohesive strength
• Two-component polyurethane systems: the hydroxyl group reacts with isocyanates
• Polymer production: pendant hydroxyl groups for post-cure modification or grafting
• The hydroxyl group provides a reactive site for crosslinking, enabling formulators to tune hardness, flexibility and adhesion in cured networks.

Commercial specifications

• Purity commonly 96% or higher
• Bulk supply in drums and IBC containers
• Inhibitor type and concentration often specified by buyers