The Defenderâ„¢ FS (Fire Safe) sealing/isolating gasket is designed to withstand the rigorous API standard 6FB (Third Edition) test and therefore provides a solution for those who want to electrically isolate their flange while also requiring protection against the potential introduction of fire in and around the flange.
The objective of the test is to monitor the total leakage for the duration of the burn/cool-down cycle and during re-pressurization. Leakage is determined by the total water level drop through a visual sight gauge during the burn/cool-down cycles, by manually catching the water in a calibrated container during re-pressurization.
The results concluded that the Defenderâ„¢ FS Gasket is able to maintain its fire safe characteristics throughout the entirety of the test. During the 30 minute burn and 30 minute cool down period, the measured leakage was 0 ml/min versus the allowable rate of 22.765 ml/min. The leakage rate during the re-pressurization cycle was 5 ml/min versus the allowable rate of 22.765 ml/min.
Based on years of technological experience with KammproÂ® core design, the Defenderâ„¢ FS sealing/isolating gasket not only meets but exceeds the pressure-containing capabilities in standard 6FB (Third Edition) as outlined by API.
Dielectric Strength Volts/Mil Short Time
Compressive Strength (psi)
Water Absorption (%)
Flexural Strength (psi)
IZOD Impact Strength (Ft-lbs/Inch
Tensile Strength (psi)
Bond Strength (lb)
Cryogenic to 302°F (150°C)
-100°F (-73°C) to 392°F ( 200°C)
NOTE: The operating temperature for gaskets and flange isolation kits is based off the gasket retainer temperature. Seal element temperature does not dictate the minimum and maximum gasket operating temperature. Performance suitability and material compatibility shall be determined by the user. The Defenderâ„¢ FS is an engineered fire safe gasket that has passed API 6FB fire test (Third Edition). No other claims regarding suitability/compatibility for a particular application or performance in a fire are made.
Biaxial Oriented PTFE
-450Â°F (-268Â°C) to 500Â°F (260Â°C)
Kammprofile PTFE Coating
-58Â°F (-50Â°C) to 350Â°F (176Â°C)
Type "F" Gasket
Double Washer Set
Suggested Sleeve/Washer Set
FD = G10 Sleeves, Steel HC Washers and Steel HC Washers - Double Washer Set
TF = Nomex Sleeves, Steel HC Washers and Steel HC Washers
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