Polyuretanmortar

Polyuretanmortar, or polyurethane mortar, is a mortar in which polyurethane resin serves as the primary binder rather than cement. It is often formulated as a two-component system or a moisture-curing one-component system, combined with inert aggregates such as silica sand. The resulting material is a flexible, adhesive, and water-resistant composite.

Composition and variants

Polyurethane mortars may be pure polyurethane binders or blends that include small amounts of cement or other polymers to tailor performance. They typically incorporate fillers, plasticizers, and curing agents to achieve desired viscosity, strength, and elasticity. Some products are designed for tile installation, crack repair, joint filling, or resurfacing of concrete and masonry.

Key properties

Polyuretanmortar generally offers high adhesion to concrete, masonry, metals, and other substrates, including damp surfaces. It provides elasticity that helps bridge cracks, good chemical resistance, and notable water resistance, making it suitable for wet areas and industrial environments. Depending on formulation, cure speed can be fast, and some products exhibit good abrasion resistance and thermal stability.

Applications

Common uses include tile setting in bathrooms and kitchens, waterproof joints and seals around waterways or submerged structures, crack injection or repair in walls and floors, and repair or resurfacing of industrial floors where chemical exposure or moisture is a concern.

Considerations

Polyurethane mortars tend to be more expensive than traditional cementitious mortars and may require stricter surface preparation and ventilation due to isocyanate components. Some formulations are UV-sensitive and not suitable for prolonged outdoor exposure unless specifically designed for exterior use. Environmental and safety guidelines should be followed during handling and curing.