From their MSDS:
http://www.imperialrestoration.com/product_images/pormsds.pdf
IV. FIRE & EXPLOSION HAZARD DATA
FLASH POINT (Method used): TCC 104 Degrees F
EXTINGUISHING MEDIA: Dry chemical (e.g.monoammonium phosphate, potassium sulfate, and potassium chloride, carbon dioxide, high expansion (proteninic)
chemical foam, water spray for large fi res.
SPECIAL FIRE FIGHTING PROCEDURES/USUAL FIRE OR EXPLOSION HAZARDS: Full emergency equipment with self-contained breathing apparatus should be worn by
fi refi ghters. During a fi re, MDI vapors and other irritating, toxic gases may be generated by thermal decomposition (see section VIII). At temperatures greater than
400 degrees F (204 degrees C), polymeric MDI can polymerize and decompose. Use cold water to cool fi re-exposed containers.
HAZARD CLASS: B HEALTH: 3 FIRE: 2 REACTIVITY: 1 FLAMMABLE LIMITS LEL: 1% FLAMMABLE LIMITS UEL: 7.1%