Does lubricating grease burn?  Is it a risk for fire?

Most greases will burn, but they are generally not considered to be fire hazards.  Most lubricating greases contain petroleum-derived mineral oil or hydrocarbon-based synthetic fluid as the lubricating fluid.  Those materials are generally considered to be combustible (flash point at or above 38 °C (100 °F).  In very few cases, the lubricating fluid in a grease would be considered to be flammable (flash point below 38 °C (100 °F).  Consult the Safety Data Sheet (SDS) for firefighting information for any specific product.