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MSHA Safety Alert - Heat Ignition Hazard


May 17, 2023 - 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. 


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Miners and mine operators can find safety and health information on