Improve Resiliency of Building Materials with LUDOX®

LUDOX® Colloidal Silica: A Versatile Tool for Building and Construction

Shotcrete and Sprayable Concrete

Concrete Sealer and Paint

LUDOX® colloidal silica can be easily added to water-based formulations to improve resilience and antisoiling properties. In latex paints, the silica particles of LUDOX® bind resins and other formulation components to create a cross-linked film that has better abrasion resistance and durability. Paints and sealers that incorporate LUDOX® also provide outstanding adhesion to masonry and cementitious surfaces, as silica forms strong bonds with inorganic materials. Additionally, LUDOX® can be used as an additive to silica-based coatings to improve the cure rate and water resistance.

Lithium polysilicate from Grace can also be used in cement coating and densifier applications with or without a potassium silicate cobinder to improve surface density, protect from corrosion, and increase cure speed. Grace's lithium polysilicate is a high-ratio silicate with a higher molar ratio of silica to metal oxide. A higher molar ratio of silica is essential to prevent deleterious aging effects in building applications.

Anticorrosion Coatings

Chromium-based coatings are commonly used to protect materials like metals, concrete, and wood from corrosion in building and construction applications. Recently, however, hexavalent chromium formulations are being phased out due to regulatory concerns. As an alternative, trivalent chromium can be used for corrosion protection. LUDOX® can help to improve the adsorption of trivalent chromium, promote film formation, and improve rheology.

Zinc-rich primers are typically used in saltwater environments to protect steel against corrosion. Grace's lithium polysilicate exhibits outstanding compatibility with zinc powder and can be used as a binder and vehicle for zinc-rich primers. The high-ratio silicate property of lithium polysilicate mentioned in the previous section contributes to faster drying times, longer pot life, and better film-forming characteristics.

Caulks and Adhesives

Caulks and adhesives play a vital role in the long term  durability of a building.  Moisture damage can be costly and result in safety issues.  LUDOX®  particles will bind to other silica and inorganics in caulks and adhesives to provide reinforcement, added strength, and improved water and chemical resistance. LUDOX® also improves the adhesion of caulks and sealants to various materials commonly used in building components.

Formulation Guidance

LUDOX® colloidal silica varies in particle size, silica content, stabilizing counterion, pH, and surface charge. The smaller particle size grades are suited for binding applications, and the larger particle size grades are better for surface modification. Most grades are stabilized with sodium, but ammonium-stabilized grades are available for applications where sodium poses an issue. Positively charged, chloride-stabilized grades are also available for formulations with significant cation levels. Care should be taken to choose a LUDOX® grade that matches the pH of the formulation. Some commonly used grades and their specifications are listed below.