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发表于 2013-10-29 00:10:06
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FH
A term used when the specific reference conditions
of Tref=160°C and z=20°C are used to
calculate the equivalent lethality. For example,
when the z-value of the BI is 20°C a process
with an F(T=160°C, z=20°C), or FH, equal to 8 minutes
is equivalent (in terms of delivered lethality)
to a square wave process of 8 minutes at
160°C. A square wave process that provided
an exposure of 45.2 minutes at 145°C would
also yield an FH of 8 minutes.
F-Value for Depyrogenation
The term F-value may also be used in dryheat
depyrogenation processes to calculate
the time in minutes equivalent to a lethality or
endotoxin destruction effect delivered by dryheat
at 250°C. The F-value reference temperature
is set at 250°C and the z-value minimum
is set at 46.4°C (5). |
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