The Benefits of Using Larsen Mortar Plasticiser

Whether you're laying bricks, rendering walls, or plastering, choosing the right admixture can make a noticeable difference to both application and final finish. At Larsen Building Products, our range of mortar plasticisers is specifically developed to improve workability, durability, and the overall quality of site-mixed mortars.

What is a Mortar Plasticiser?

A mortar plasticiser is a chemical admixture added during the mixing process. Its main role is to improve the workability and cohesion of mortar, making it easier to spread, handle, and apply.

Plasticisers work by introducing microscopic air bubbles into the mix. These bubbles reduce water surface tension and act as a lubricant between sand particles, resulting in smoother flow and easier trowelling.

Larsen Mortar Plasticisers are formulated using a carefully selected blend of synthetic surfactants, delivering consistent, high-quality performance on site.

Key Benefits of Larsen Mortar Plasticiser

Enhanced Workability – Without Lime

Larsen plasticisers provide the same level of workability as lime, without the associated handling difficulties. This simplifies the mixing process, reduces labour time, and improves on-site efficiency.

Improved Frost Resistance

By entraining fine air bubbles, plasticisers increase mortar resistance to freeze-thaw cycles. This makes them particularly valuable for external masonry and winter construction work.

Reduced Shrinkage and Crazing

The use of plasticiser helps minimise shrinkage cracking and surface crazing, resulting in a smoother, more durable finish for both brickwork and rendered surfaces.

Lower Water Demand

Plasticisers reduce the amount of water required in the mix while maintaining excellent workability. This leads to stronger, denser mortar and helps limit drying shrinkage.

Chloride-Free Formulation

All Larsen mortar plasticisers are chloride-free, making them safe for use with steel reinforcement and reducing the risk of
corrosion-related damage.

Larsen Mortar Plasticiser Range

Larsen Mortar Plasticiser

Ideal for general-purpose use in bricklaying and sand/cement rendering. Available in 5L, 25L, and 200L sizes; it provides dependable workability and frost resistance without the need for lime.

Recommended dosage: 0.5L per 100kg of cement

Larsen Extra Strength Mortar Plasticiser

Designed for projects requiring enhanced performance, this formulation offers increased plasticising power and reduced water demand. Particularly suited to plastering and large-scale masonry work where consistency is critical.

Recommended dosage: 0.3–0.5L per 100kg of cement

Larsen Concentrated Mortar Plasticiser

A highly efficient solution, up to 25 times more concentrated than standard plasticisers. Supplied in 1L dosing bottles, it’s ideal for precise batching and sites with limited storage.

Recommended dosage: 10–25ml per 25kg of cement

Larsen Powder Mortar Plasticiser

A practical option where storage convenience and stability are important. Supplied in 25kg tubs, this powder formulation delivers consistent performance for bricklaying and rendering applications. Fully compliant with BS EN 934 and chloride-free.

Choose Performance You Can Rely On

Selecting the right mortar plasticiser isn’t just about improving workability—it’s about ensuring long-term durability, protecting against environmental conditions, and achieving a high-quality finish every
time.

Whether you're tackling a domestic project or a large-scale development, Larsen offers a solution you can depend on.