Zr-104 Enhanced Zirconia Silica Fume | Zirconium Microsilica Fume ZSF104

Zr104 zirconium Silica Fume is a highly reactive, ultrafine powder obtained by collecting and condensing volatile gaseous silica during the production of electrically fused zirconia (extracted from zircon sand). Compared to ordinary ferrosilicon-based Microsilica, Zr104 has three distinct characteristics: Whiter color: With extremely low carbon content, it typically appears grayish-white or pure white and does not affect the color of the end product. Higher refractoriness: It typically contains trace amounts of zirconia (ZrO₂), which confers superior high-temperature resistance and resistance to alkali erosion. Purity and morphology: It possesses an extremely high content of amorphous (non-crystalline) silica and an exceptionally regular spherical microstructure, resulting in better flowability.

With its high pozzolanic activity and excellent physical properties, Zr104 is primarily used in high-end manufacturing and specialty building materials: High-performance refractory materials: Such as low-cement castables and precast components, where it significantly improves density and high-temperature strength. Specialty concrete and building materials: Ultra-high-performance concrete (UHPC), white or light-colored decorative mortars, and non-shrink grouts. Advanced ceramics and coatings: As a sintering aid for specialty ceramics or as a high-performance filler in wear-resistant coatings.

Traditional Microsilica is dark gray or black, which significantly limits its use in light-colored products. Zr104’s grayish-white appearance perfectly addresses this challenge. It allows formulation engineers to develop light-colored or color-customized products—such as high-end decorative exposed concrete and colored grout—without sacrificing mechanical properties or durability, while also reducing the amount of expensive titanium dioxide required.

Recommended dosage: Typically 3% to 10% of the total weight of the cementitious materials (such as cement or aluminate cement). The specific proportion must be verified through formulation testing based on the target strength and workability. Mixing Recommendations: Due to Silica Fume’s high specific surface area and strong water absorption, direct dry mixing can easily lead to agglomeration. It is recommended to mix thoroughly during the dry powder mixing stage and to use a high-performance water-reducing admixture (such as a polycarboxylate-based admixture) when adding water to ensure uniform dispersion of the powder in the slurry and to achieve optimal flowability.

Zr104 plays a dual role in the system as “micro-ball bearings” and through “pozzolanic reaction.” Early stage: Its ultrafine spherical particles fill the microscopic pores between cement particles, displacing free water and increasing density. Later stage: Its highly reactive amorphous SiO₂ undergoes a secondary reaction with calcium hydroxide (Ca(OH)₂) produced by cement hydration, forming a hard calcium silicate hydrate (C-S-H) gel. This not only significantly enhances the compressive and flexural strengths in the later stages but also substantially reduces the material’s porosity, improving its impermeability and corrosion resistance.

Moisture-Proof Storage: Must be stored in a dry, well-ventilated indoor environment, away from rain and high humidity. Once exposed to moisture, Silica Fume will undergo irreversible agglomeration and caking, losing its original dispersibility and reactivity. Dust Protection: Since particle sizes are mostly in the submicron range (0.1–0.2 μm), the material is highly prone to becoming airborne. When opening packages or dispensing the material, operators must wear dust masks (N95 or higher) and safety goggles to prevent respiratory issues caused by prolonged inhalation of dust.