Silica is silicon dioxide, in the form of tiny, airborne crystals, which occurs naturally in soil and is present as an ingredient in many man-made substances such as brick, concrete, and asphalt.
Silica is silicon dioxide, in the form of tiny, airborne crystals, which occurs naturally in soil and is present as an ingredient in many man-made substances such as brick, concrete, and asphalt.
In sufficient concentrations, it can cause silicosis and other diseases. Silica and silica-related dust is commonly the subject of an exclusion in general and umbrella liability policies.