Epoxiplaster

Epoxiplaster is a plaster-like construction material in which an epoxy resin binder is used to bind mineral aggregates, producing a hard, adhesive, and chemically resistant coating or repair layer. It is commonly used as an alternative to traditional cementitious plasters in environments that require enhanced bonding, durability, or chemical resistance.

Composition and formulations typically involve epoxy resin combined with a hardener, such as an amine or anhydride, and mineral fillers like sand, cement, or calcium carbonate. Additives may be included to adjust workability, thixotropy, or color. The mix is prepared in specified resin-to-hardener ratios and applied by trowel, spray, or other suitable methods. Curing occurs through epoxy polymerization and can vary from a few hours to a day or more, depending on formulation, ambient conditions, and thickness.

Properties commonly associated with epoxiplaster include high bond strength to concrete and masonry substrates, good abrasion and chemical resistance, relatively low permeability, and dimensional stability. It can be formulated as a crack-bridging or decorative finish and may be used for wall repairs, decorative plastering, floor toppings, or protective linings in industrial or marine environments. Typical thicknesses are in the range of a few millimeters to several millimeters per coat, with full cure requiring days.

Applications and installation emphasize surface preparation, including thorough cleaning and roughening of substrates, priming with epoxy primers, and careful mixing of resin and hardener. Limitations include higher cost compared with cementitious plaster, sensitivity to improper mixing or moisture during curing, and the need for appropriate personal protective equipment due to epoxy resin exposure.