Graphite, ignition temperature

Fire Hazards - Flash Point Not flammable but may cause fires upon contact with combustible materials Flammable Limits in Air (%) Not pertinent Fire Extinguishing Agents Flood with water, dry powder (e.g., graphite or powdered limestone) Fire Extinguishing Agents Not To Be Used Not pertinent Special Hazards of Combustion Products Not pertinent Behavior in Fire Can increase the intensity of fires Ignition Temperature Not pertinent Electrical Hazard Not pertinent Burning Rate Not pertinent. 

The effects of catalysts on the oxidation temperature can be significant. For example, lead (Pb), copper (Cu), silver (Ag), iron (Fe), platinum (Pt), and nickel (Ni) were found to lower the ignition temperature of graphite powder from 740°C to 382°C, 570°C, 585°C, 593°C, 602°C, and 613°C, respectively [21]. In all of these cases, the concentration of the metal in the sample was <0.2 wt.%. While catalysts are widely used for large-scale production of chemicals and play an important role in biological processes, they are considered as impurities in the case of carbon nanomaterials as they alter their properties and limit the number of potential applications. 

A hazardous potential was thought to exist in the AVR HTGR, Julich, with a hydrogen-carbon monoxide-helium-air mixture, which could evolve in a water ingress accident scenario with an estimated 8 % H2 + CO concentration resulting from the corrosive reaction between steam and hot fuel element graphite. Ignition experiments in a combustion chamber were conducted in 1971 to examine the lower combustibility limit in respective gas mixtures. The tests have shown that a mixture with 22 % H2 + CO was not flammable at temperatures up to 120 °C [54],... 

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