The Ultimate Engineering Guide: MasterCast 355 - The Definitive Solution for Waterproof Mortar & Concrete
In major construction projects, ground moisture, rainwater, and salt efflorescence are the primary threats to the structural integrity of facades, fences, and foundations. MasterCast 355 emerges as a high performance chemical solution engineered by Master Builders Solutions and supplied by The Specialist Company (STC) to modify the properties of mortar and concrete, making them completely resistant to water penetration.
Technical Deep-Dive: How Does MasterCast 355 Work?
Unlike surface-level coatings that can peel or degrade over time, MasterCast 355 works from within the concrete matrix. It is a "Hydrophobic" powder admixture based on advanced pore-blocking technology.
Mechanical Action: Upon addition to the mix, its active ingredients react to form an insoluble lining within the concrete’s microscopic capillaries and pores.
The "Breathing" Property: While it blocks liquid water from entering, it remains permeable to water vapor (Vapor Permeability). This prevents internal "sweating" and the growth of mold or mildew inside the building.
Strategic Advantages (Why Consultants Specify It)
A. Maximum Efflorescence Control
Concrete blocks and external facades often suffer from white, salty stains that ruin the aesthetic. MasterCast 355 traps these salts within the concrete and prevents them from migrating to the surface, maintaining color stability and architectural beauty.
B. Up to 90% Reduction in Capillary Absorption
It effectively cuts off rising damp in walls (Damp-proofing), protecting interior paints, wallpapers, and delicate decorations from moisture damage.
C. Enhanced Workability & Cohesion
Thanks to its sophisticated formulation, it acts as a mild plasticizer. This reduces the need for excess mixing water, resulting in a denser, mechanically stronger mortar once cured.
D. Lifetime Durability
The material is chemically stable and does not degrade. Once the concrete cures, the protection becomes an integral part of the structure, unaffected by UV rays or extreme weather conditions.
Primary Applications (Where to use MasterCast 355?)
External Plastering (Render): Protecting facades from "soaking" up rainwater.
Cement Product Manufacturing: (Interlock, Curbs, Concrete Bricks) to increase resistance to salts and environmental wear.
Bonding Mortars: In the waterproofing systems of kitchens, bathrooms, and swimming pools as an extra layer of security.
Foundations & Neck Columns: Protecting buried concrete from sulfate attacks and ground moisture.
Technical Data & Application (Professional Method Statement)
To achieve the best results as recommended by STC, follow these steps:
Dosage: The standard dosage ranges from 250g to 500g per 50kg bag of cement.
Mixing Method: It is highly recommended to mix the powder with the cement and sand while dry to ensure uniform distribution, then gradually add water.
Priming: For plastering, a rich cement "spatter dash" (Tanit) containing the admixture is recommended to ensure perfect adhesion.
Take Your Next Step Toward Sustainable Construction
Don't let moisture threaten your structural investment. At The Specialist Company (STC), we provide globally certified engineering solutions backed by on-site technical support.
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