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Mortars, renders & plasters

Mortars, renders and plasters Imerys minerals improve mechanical properties and surface of mortars, renders, plasters, ETICS and EIFS

Imerys minerals make ideal multifunctional fillers in mortars, plasters, renders, ETICS and EIFS where they improve mechanical properties and surface appearance.


Pinholes are generally the result of the capillary effect between the coarser plaster particles and renders, and cracks are due to shrinkage. Imerys talc, leucophyllite, carbonates, diatomaceous earth and perlite reduce pinholing and cracking in plasters and renders.

Coating and finishing mortars and plasters


Imerys perlites offer a number of key advantages in plasters and mortars used primarily for coating and finishing walls.
Expanded perlite is a vital ingredient in lightweight plasters and mortars where it brings:

  • Lightweighting
  • Substantial increase in insulation properties
  • Improved fire protection
  • Enhanced fluidity and strength of the paste during pumping
  • Higher workability
  • Smooth release of water during hardening hence no cracking
  • Greater elasticity combined with higher wall adhesion
  • Improved color
  • Reduction of raw material required


Imerys platy talcs are excellent solutions for improving mechanical properties and cracking in self-leveling floor mortars.

Talc platelets demonstrate an affinity for polar organic binders and excellent dispersibility in water. This means that they disperse easily in water-based systems such as cementitious self-leveling and self-smoothing floor mortars.

Imerys talc:

  • Provides self leveling properties
  • Lowers shrinkage
  • Improves crack resistance
  • Enhances surface aspect
  • Improves powder flow
  • Increases tensile strength, compressive strength, flexibility and stamping resistance
  • Increases abrasion resistance
  • Improves viscosity and adhesion
  • Minimizes settling


Imerys muscovite micas are good solutions for improving mixing and trowelling properties in mortars and to improve the flexibility of the finished product.


Imerys reactive metakaolin pozzolans are ideal for achieving hydraulic sets in traditional lime putty mortars and plasters and for improving the mechanical strength of floor mortars. Pozzolans are particularly helpful when applying lime putty mixes in damp, frost prone or exposed locations. The addition of metakaolin pozzolans to lime putty mixes will increase compressive strength which helps to offer additional protection during the carbonation period.

Ground carbonates

Ground carbonate provides particle packing to improve workability and improve water retention. Carbonate can be used as a partial replacement for white cement, which reduces costs in the formulation. 


We offer a full range of bespoke formulation and technical and process support services to help you match the right mineral grade to your application requirement.

Please contact us, we will be only too happy to help

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