Whether laying bricks, rendering walls or plastering, the right admixture can make a significant difference to both application and finish. At Larsen Building Products, our range of Mortar Plasticisers is designed to enhance the workability, durability and overall quality of site-mixed mortars. Discover the benefits of using Larsen Mortar Plasticiser below.  

But First, What is Mortar Plasticiser? 

Mortar plasticiser is a chemical admixture added to mortar during mixing. Its primary function is to improve the workability and cohesion of the mortar, making it easier to spread and apply. By entraining fine air bubbles into the mix, plasticisers reduce the surface tension of water and act as a lubricant between sand particles, improving flow and ease of trowelling. 

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

The Benefits of Using Larsen Mortar Plasticiser 

✅ Enhanced Workability Without Lime
Larsen Mortar Plasticisers are an ideal substitute for lime, offering similar pliability in mortar but without the handling challenges lime presents. This reduces labour time and increases productivity. 

✅ Improved Frost Resistance
Entraining fine air bubbles into the mortar mix increases its resistance to frost, a crucial benefit for masonry exposed to fluctuating outdoor temperatures. This makes our plasticisers particularly beneficial for winter construction projects. 

✅ Reduced Shrinkage and Crazing
Larsen Mortar Plasticisers help reduce the occurrence of shrinkage cracks and crazing, ensuring a smoother, more durable finish in brickwork and rendering applications. 

✅ Water Reduction
Using plasticiser reduces the water requirement in mortar mixes without compromising workability. This not only helps in achieving stronger, denser mortar but also minimises drying shrinkage. 

✅ Chloride-Free Formulation
All Larsen mortar plasticisers are chloride-free, making them safe for use with steel reinforcement and preventing corrosion-related failures. 

At Larsen Building Products, we offer a range of plasticisers tailored to specific site needs: 

Larsen Mortar Plasticiser 

Ideal for standard site-mixed mortars for bricklaying and sand/cement rendering. Packaged in 5L, 25L, and 200L formats, it provides reliable frost resistance and workability without the need for lime. Recommended Dosage: 0.5L per 100kg cement. 

Larsen Extra Strength Mortar Plasticiser 

For projects that require enhanced performance, our Extra Strength formula delivers even greater plasticising power while reducing water demand. Perfect for plastering or extensive masonry work where mix consistency is critical. Recommended Dosage: 0.3 – 0.5L per 100kg cement.

Larsen Concentrated Mortar Plasticiser 

Designed for high efficiency and minimal storage requirements, this concentrated solution is up to 25 times stronger than conventional plasticisers. Supplied in 1L dosing bottles, it’s ideal for professionals needing precision in mortar batching. Recommended Dosage: 10–25ml per 25kg cement.

Larsen Powder Mortar Plasticiser 

When convenience and storage stability are essential, our powder variant offers consistent performance in bricklaying and rendering applications. Packaged in 25kg tubs, it’s easy to store and handle on busy sites. BS EN 934 compliant and chloride-free. 

Choosing the right plasticiser is about more than improving workability—it’s about ensuring durability, protecting against the elements and achieving a superior finish in every job. Whether you’re working on domestic renovations or large-scale developments, Larsen has a mortar plasticiser to meet your needs. 

Explore the full range of Building Chemicals now.