Heat and Ignition Hazard
Improperly applying large quantities of foam products to fill voids can cause underground mine fires. Polyurethane-based foam products will produce heat from an exothermic chemical reaction.
Best Practices:
• Use the Proper Product. Do not fill large voids with foam products that generate a hazardous amount of heat.
• Follow the Manufacturer’s Directions.
• Train Miners. Train miners before handling and using foam, grout, and resin products, including potential heat hazards.
• Educate Miners on Chemical Exposure Hazards. Provide miners with Safety Data Sheets (SDS).
• Foam Placement. Form used to support foam should be fire resistant or fire retardant.


Miners and mine operators can find safety and health information on MSHA.gov.