| http://www.w3.org/ns/prov#value | - Preferably the residence time in the reaction zone for a species generated in or near the flame should be at least about one millisecond, and is preferably 5 to 10 milliseconds or longer. [0056] The porous refractory can be made of any refractory material that does not melt under its radiative heat load, including carbon and ceramics such as zirconia, alumina, and cordierite.
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