Silica fume is a fine mineral admixture consisting of silicon dioxide particles. It is produced during the manufacturing of silicon and ferrosilicon alloys. When used in concrete, silica fume acts as both a filler, enhancing the material’s density, and a pozzolan, chemically reacting with cement to improve strength and durability.

Silica fume is generally safe to handle when appropriate precautions are observed. While it is non-combustible and stable under normal conditions, the fine dust can cause eye and respiratory irritation.

To ensure safe handling:

• Avoid Generating Dust: Minimize activities that create airborne dust. Use methods such as high-efficiency vacuum cleaning to collect any spilled material.
• Ensure Adequate Ventilation: Work in well-ventilated areas to prevent dust accumulation. Mechanical ventilation may be necessary to maintain exposure below permissible limits.
• Use Personal Protective Equipment (PPE): Wear appropriate PPE, including NIOSH-approved respirators when dust levels are high, safety goggles to protect the eyes, and chemical-resistant gloves to prevent skin contact.

Following these guidelines, you can safely handle silica fume and minimize potential health risks.