Understanding the UL Fire Resistance Directories
Finish
Rating VS
Fire
Rating
ò
Fire Ratings
á
pertain to a total ASSEMBLY
ò
ò
Finish Rating
á
is the time required to obtain an average
temperature rise of 250 degrees
(or a single point rise of 325
degrees) between the material being tested (gypsum board) and
the substrate being protected (i.e. plywood).
á
ò
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