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.