Q1: Why does zinc fluorosilicate harden concrete?

Zinc fluorosilicate primarily hardens concrete by reacting chemically with excess and loose calcium hydroxide (free lime) in the concrete to form high-hardness, high-density hydrated calcium silicate (C-S-H gel) and calcium fluoride. These new substances effectively fill the capillaries and microcracks on the concrete surface, significantly improving surface hardness, wear resistance, and density. More uniquely, zinc fluorosilicate can also react with carbonized calcium carbonate to form fluorosilicone gel, making it particularly suitable for repairing old, sandy, or poor-quality concrete surfaces, providing both strengthening and repair.

Q2: What is the solubility of zinc fluorosilicate? How should the solution be prepared?

It is readily soluble in water. Its solubility in water increases significantly with increasing temperature. A 1% aqueous solution has a pH of approximately 3.2 and is toxic.

Prepare an aqueous solution of zinc fluorosilicate and water in a ratio of 1:4 before spraying or brushing it onto the concrete surface.

Q3: What is the shelf life of zinc fluorosilicate? How should it be stored?

Store in a sealed container in a dry, cool, and well-ventilated warehouse, avoiding moisture and high temperatures. The shelf life is typically 12 months.

Storage precautions: Store in a dry warehouse below 25℃ (relative humidity ≤65%), away from acids, alkalis, and food. During transportation, protect against moisture, collisions, and damage to the packaging.