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Like any dirt, clays contain quartz. Quartz particles are all around us, the mineral makes up about 12 percent of the land surface and about 20 percent of the Earth's crust. It is impossible to get away from quartz particles (e.g. road and street dust are common sources). Farmers and construction workers are constantly exposed to it. Quartz inhalation is a hazard when:
1. Inhaled particles are just the right size to block the tiny air passages in the lungs.
2. Chronic exposure over a long period occurs (or shorter exposure to high concentrations).
Since you don't know the particle size of any dust, it is only sensible to take precautions against #2. We do know that respirable particles that can get stuck in the lungs are <5 microns. Clay powders used in ceramics are typically ground to 75 microns, far larger. However, that processing does produce lots of finer sizes also, so there is good reason to keep dust down. Specifics about the hazards of powders used in ceramics are available on SDSs (Safety Data Sheets).
Hazards |
Quartz Toxicity
Extended exposures to lower concentrations or less frequent exposures to higher concentrations can cause silicosis. |
Hazards |
Dealing With Dust in Ceramics
A checklist for changes and additions to your tools and equipment and suggestions for habit you need to develop to control dust in your workplace. |
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