Exposure is highly unlikely because of the solid nature of the product.
These products are certified by the institute to be labeled in accordance with the voluntary chronic labeling standard ASTM D-4236. Solid chalk in a pencil diameter. See label for color of contents. No fire or explosion hazard associated with this product. There are no known conditions to avoid, incompatible materials, hazardous decomposition products, or hazardous polymerization, associated with this product.