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Chalk EHS

From Material Safety Data Sheet
Chalk Chemical name: Calcium Carbonate
Inhalation: Avoid long term exposure by inhalation of dust
Ingestion: Ingestion should not cause any significant health problem.
Skin Contact: Avoid long term exposure to skin
Eye Contact: May cause irritation of eyes.
Chronic Exposure: No data
Acute Effects: No data
Aggravation of Pre-existing Conditions: Persons with pre-existing eye, skin, or respiratory problems may be at increased risk.

What does this mean?
Avoid inhaling chalk dust when using it. Chalk dust can irritate your eyes. If eye contact occurs, flush eyes with large quantities of water.

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