TERMS YOU NEED TO KNOW
TPP – Thermal Protection Performance
TPP is tested on the 3 layers only (Outer Shell, Thermal Liner and Moisture
Barrier) not the garment itself, but only the 3 layers used in construction.
TPP Value is presented as a range as the test results vary slightly. (TPP=
40-42)
Minimum is 35 TPP (17.5 seconds)
Rule: The TPP Value, divided by two, equals the amount of seconds it takes
skin to reach 2nd degree° burn through the 3 layers of the garment (44 TPP =
22 seconds, 42 TPP = 21 seconds).
NOTE!: TPP is often confused with Thermal Resistance.