Based on the provided information, a specific form of silica, known as respirable crystalline silica, occurs when certain materials are mechanically processed.
Understanding Respirable Crystalline Silica
Respirable crystalline silica is characterized by its extremely small particle size – it is at least 100 times smaller than the ordinary sand found on beaches or playgrounds. This minute size allows it to become airborne and easily inhaled, which is why it's a focus in occupational safety.
How Respirable Crystalline Silica is Created
According to the reference, respirable crystalline silica is created through specific industrial or construction activities that involve manipulating silica-containing materials.
These activities include:
- Cutting
- Sawing
- Grinding
- Drilling
- Crushing
The materials processed in these ways that lead to the creation of respirable crystalline silica include:
- Stone
- Rock
- Concrete
- Brick
- Block
- Mortar
Therefore, in the context described by the reference, silica (specifically the respirable crystalline form) occurs or is generated when these materials are broken down using the mentioned mechanical processes.
