The fire or flammability properties of plastics vary similarly to the way their other properties vary. There are those that burn very easily to those that do not burn. There are also plastics that cause no smoke and those that release large amount of smoke. Like other materials, hot enough fires can destroy all plastics. Some burn readily, others slowly, others only with difficulty; still others do not support combustion after the removal of the flame. As reviewed there are certain plastics used to withstand the re-entry temperature of 2,500°F (1,370°C) that occurs when a spacecraft returns into the earth's atmosphere; the time exposure is part of a millisecond. Different industry standards can be used to rate plastics at various degrees of combustibility.

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