The Defender™ sealing/isolating gasket system is designed for critical/extreme applications. Manufactured with a 316 stainless steel core retainer and laminated on both sides with high strength laminates, the Defender™ gasket is resistant to deforming under load and is used when electrical isolation and corrosion control are required on pipes containing gas, natural gas, oil and other hydrocarbon based medias up to 392ºF (200ºC). Available for flat face, raised face and ring type joint flanges from 1/2" to 36", ANSI 150-2500# and API 2-10K, the Defender™ gasket is an engineered solution for trouble-free operation that eliminates costly leaks and provides a solution for fugitive emissions. It is manufactured with an innovative industry first Press-n-Lock™ "Glue-Less Seal & Groove Technology" that combines a press-in, pressure activated and spring energized seal with a unique groove that retains the seal element without the use of glue on key contact surfaces! The Press-n-Lock feature provides a higher confidence in sealing.
Defender Gaskets are laser engraved with company name/logo, date of manufacture, and product description/part number.
The flange face makes initial contact with the sealing element which protrudes above the gasket retainer surface (isolation material) laminated on both sides of the stainless steel core.
The spring energized, pressure activated sealing system is initiated. The base of the Teflon® seal is contained within the stainless steel core to provide superior sealing strength for critical/extreme sealing applications. The spring prevents over-compression of the Teflon® seal thereby allowing the pressure of the media within the pipe to activate the seal. G10 or G11, laminated on both sides, provides the dielectric strength needed to isolate the flange application and has the compressive strength to easily withstand high bolt loads.
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)
Temperature - Operating
Cryogenic -238°F (-150°C) to +302°F (+150°C)
-100°F (-73°C) to +392°F (+200°C)
NOTE: Operating Temperature for Gaskets and Flange Isolation Kits is based off the Gasket Retainer Temperature. Seal element temperature does not dictate the min. and max. gasket operating temperature.
Temperature - Operating
Cryogenic to +525°F (+274°C)
-40°F (-40°C) to +250°F (+121°C)
-20°F (-29°C) to 392°F (+200°C)
Type "F" Gasket
"E" or "F" Type Gaskets
Single Washer Set
Double Washer Set
Suggested Sleeve/Washer Set
SD = Standard (G10 Sleeves, Steel Zp Washers and G10 Washers) - Double Washer Set
Defender gaskets were engineered for extreme, high reliability sealing and electrical isolation critical service applications.
Production Fields, Petroleum Marketing Facilities, LNG/SNG Systems, Pipeline and Distribution Piping, Refineries
"Proven design based on the industry leader."
"Enhanced with innovative engineered features."
"Tested to Shell Certification Standards."
"Industry First! The Press-n-Lock™ "glue-less seal & groove technology", an engineered Lamons design, has significant sealing advantages vs. other brands."
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