In order to assess the additional amount of HFC-125 required as a substitute for Halon 1301 in an existing Halon 1301 based system in which the agent discharge time is extended beyond the heretofore standard 10 second maximum discharge time
Given any specific fire extinguishment test that results in both the extended discharge and standard discharge extinguishment times being approximately equal, the following preferred formula has been found to predict the critical averaging
Based on tests conducted as described, it has been determined that the critical averaging time span is no more than about 100 seconds in the case of Class A polymers (PMMA) and usually does not exceed about 85 seconds.
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