The document describes the DefenderTM FS gasket, which is designed to electrically isolate flanges while providing fire protection. It passed the API 6FB fire test, maintaining a leakage rate below specifications during a 30-minute burn, 30-minute cool down, and 5-minute re-pressurization cycle. The gasket incorporates proven Kammpro® sealing technology and is suitable for applications requiring high reliability sealing and isolation at high pressures and temperatures.

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IsoTek™ Isolation
Defender™ FS Gasket
Fire Safe

2. The Defender™ FS sealing/isolating gasket is designed to withstand the rigorous API stan-
dard 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 intro-
duction 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 was 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 Defender™ FS Gasket was 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 Kammpro® core design, the Defender™ FS
sealing/isolating gasket not only meets but exceeds the pressure-containing capabilities in
standard 6FB (Third Edition) as outlined by API.
General Features
·· Tested and Certified to API 6FB (Third Edition).
·· Two integral robust sealing elements for sealing and isolating in an engineered
Fire Safe design.
·· Serves as a sealing/isolation for Fire Safe Applications.
·· Incorporates industry proven Kammpro® sealing technology.
Applications
Defender™ FS gaskets are engineered for Fire Safe, extreme, high
reliability sealing and electrical isolation critical service applications.
·· High Pressure Flanges: 2500 Class or API 10K
·· Critical/Extreme service
·· High pH service
·· H2
S/CO2
service
·· Locations where end users prefer an integral seal element
and in applications where high volatile fluids are present.
Sizes
·· 1/2” through 24” diameter
Specialty dimensions and sizing available upon request
·· Available as “F” Type Gasket
IsoTek™ Defender™ FS
Isolation Gaskets
API Standard 6FB
Third Edition Fire Test
IsoTek™ Isolation Kits
Sleeves & Washers
For complete isolation, sleeves and washers are needed with an IsoTek™ sealing and iso-
lation gasket. To isolate connecting flanges and protect the gasket and flange from cor-
rosion, Lamons provides sleeve and washer sets to complete the isolation system. The
sleeves and washers prevent current from reaching the bolts/studs and nuts.
Sleeve and washer sets are available in Single and Double washer sets.
Model F = Fire Safe
G10 Sleeves, Steel HC Washers
Type F
Gasket is installed inside bolts
Fire Test Report
In Accordance with
API Standard 6FB, Third Edition
Performed for
Lamons
6 inch Class 300 Defender FS Gasket
CS Flange/ B7 Studs/ 2H Nuts
Dielectric Sleeves/ Coated Steel Washers
Start Date: May 2, 2013
End Date: May 2, 2013
Performed by
United Valve
9916 Gulf Freeway
Houston, TX77034
Phone: 713-944-9852
Fax: 713-944-5964
www.unitedvalve.com
Isolation Kit
Installed in Flanges
For Applications with Different Flange Types,
use Lamons DefenderTM
FS Gasket
RTJ Flange
Isolation Barriers
Raised Face Flange
Defender™ FS Seal Detail
0.3125”
(7.93 mm)
0.156”
(3.96 mm)
G11 Retainer
Material
Encapsulated with
PTFE Coating
Kammpro® Seal Design
Dielectric Mica
Sealing Material
Matrix L110
PTFE Sealing
Element
316 SS
Metal Core

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Sleeve Material Washer Material
ASTM Test Method G10 Nomex® G10 G11 HC
D149
Dielectric Strength Volts/
Mil Short Time
750-800 600 750-800 550 500
D570 Water Absorption (%) 0.5 7.0 65,000 63,000 N/A
D790 Flexural Strength (psi) 65,000 18,000 0.05 0.1 N/A
Cut Through Resistance High Low N/A N/A N/A
Operating Temperature
Cryogenic to
302⁰F (150⁰C)
-65 to 450⁰F
(- 54 to 232⁰C)
Cryogenic to
302⁰F (150⁰C)
-100 to 392⁰F
(- 73 to 200⁰C)
-40 to 450⁰F
(- 40 to 232⁰C)
Sleeve and Washer Material Physical Property Specifications
API Standard 6FB Test Procedure
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 gas-
ket operating temperature. Performance suitability and material
compatibility shall be determined by the user. The Defender™ FS
is an engineered fire safe gasket that has passed API 6FB fire test
(Third Edition). No other claims regarding suitability/compatibil-
ity for a particular application or performance in a fire are made.
ASTM Test Method G10S G11S
D149
Dielectric Strength
(Volts/Mil Short Time)
750-800 550
D695 Compressive Strength (psi) 65,000 63,000
D570 Water Absorption (%) 0.05 0.1
D790 Flexural Strength (psi) 65,000 60,000
D256
IZOD Impact Strength
(Ft-Lbs/Inch)
14.00 12.00
D638 Tensile Strength (psi) 50,000 42,000
D732 Shear Strength (psi) 21,000 21,000
D952 * Bond Strength (lb) 2,600 2,200
Operating Temperature
Cryogenic to
302⁰F (150⁰C)
-100 to 392⁰F
(-73 to 200⁰C)
Sealing/Isolation Gasket Material
Physical Property Specifications
Variable Data Recorded
Average System Pressure 550.59 psi
Average Flame Temperature 1722.72°F (939.28⁰C)
Time to Reach Flame Temperature of 1400°F (760⁰C) 1 minute, 30 seconds
Average Calorimeter Temperature 1329.4°F (720.7⁰C)
Time to Reach Average Calorimeter Temp. of 1200°F (648⁰C) 10 minutes, 30 seconds
Total Burn Time 30 minutes
Total Cool Down Time 30 minutes
Total Repressurization Hold Time 5 minutes
Average System Pressure During Repressurization 556.71 psi