PSI LineBacker® Sealing Gaskets utilize a patented rectangular sealing element, referred to as a “quad” ring, in combination with a unique groove design to effectively seal and isolate flanges of all types. This unique design provides elastic memory. Materials such as polyimide, TFE (Teflon) and vinyl may be used as sealing elements, which dramatically increases the options available for matching gasket materials to service and environmental conditions. A much broader range of retainer material/seal element combinations may therefore be used for excellent temperature and chemical range compatibility.

Features of the LineBacker® Sealing Gasket:

Eliminates flange leaks.

Guards against blowouts.

Protects against fire and hostile environments.

Usable with any type of flange.

Matches gasket materials to service conditions.

Lowest possible clamp and compressive load.

Increases gasket life.

Insulating version is both a positive seal and a superior insulator.

Available in all standard ANSI and API flange sizes from 1/2” and above.

Available in custom or odd sizes and shapes.

Available in pressure ratings for all ANSI and API rated flanges.\

For pressures from hard vacuum to 50,000 psi and higher.

How LineBacker Works
Before Tightening
The flange faces come into contact with the sealing elements, which extend slightly above the surface of the retainer. As the flange is tightened the sealing elements are compressed and move sideways into the inclined portion of the groove, developing a high unit pressure against the flange faces.,

After Tightening
The flange faces have come into firm contact with the retainer, thus encapsulating the sealing elements within grooves. At the same time, the unique LineBacker seal configuration provides elastic memory for elastomers not normally associated with this characteristic - resulting in a simple flat gasket with extremely high loading and self energizing characteristics without adverse cold flow problems.,

LineBacker® gaskets are available in a wide variety of retainer and sealing element combinations for matching gaskets to service and environmental conditions. This greater variety of materials also provides excellent temperature and chemical range compatibility.

 

Metal Retainer Materials	Insulating Retainer Materials	Sealing Elements
Aluminum Brass Carpenter 20 Carbon Steel Cast Iron Clad Steel Materials Copper Ductile Iron Hastelloy B Hastelloy C Hastelloy X Inconel X Monel Nickel 200 Soft Iron Stainless Steel Tantalum Tin Titanium Vanadium	Ceramic Epoxy Glass Glass Lucite Melamine Phenolic Polyester Glass Polyethylene Polyphenol Ether Pyrox Silicone Glass Vinyl	Buna-N (Nitrile) Buna-S Butyl EPDM Hypolon Kel-F Natural Rubbers Neoprene Nylon Polyimide Polyurethane Silicone Rubber Teflon* Vinyl Viton* *DuPont

Medium	Retainer	Seal	Temperature Range °F	Temperature Range °C
Acetone	Phenolic	Nitrile	+32 to +80	0 to +27
Air	G-10	Nitrile	-65 to +225	-54 to +107
Ammonia Dry	G-10	Teflon	-65 to +220	-54 to +104
Ammonia (Wet)***	G-10	Teflon	+32 to +100	0 to +38
Bleach	G-10	Teflon	+32 to +80	0 to +27
Butylene (Butidiene)	G-10	Teflon	+32 to +100	0 to +38
Carbon Dioxide	G-10	Nitrile	+32 to +150	0 to +66
Caustic Soda (NaOH)	G10	Teflon	-65 to +225	-54 to +107
Cryogenic	G-10	Teflon	-300 to +280	-184 to +138
Ethanol	G-10	Nitrile	+32 to +100	0 to +38
Ethylene (Ethene)	G-10	Teflon	+32 to +80	0 to +27
Fuel Oil	G-10	Viton	-20 to +280	-29 to +138
Gas, Natural	Phenolic	Nitrile	-65 to +220	-54 to +104
Gas, Sour	Phenolic	Viton	-20 to +220	-29 to +104
Gasoline	G-10	Teflon	-65 to +225	54 to +107
Hydrogen	G-10	Nitrile	-65 to +250	-54 to +121
Jet Fuel	G-10	Viton	-20 to +225	-29 to +107
LNG	G-11	Teflon	-300 to +100	-184 to +38
Mercaptan	G-10	Teflon	-20 to +80	-29 to +27
Methanol	G-10	Teflon	+32 to +100	0 to +38
MTBE	G-10	Special Nitrile	+32 to +80	0 to +27
Nitrogen	Phenolic	Nitrile	-65 to +220	-54 to +104
Oil, Crude	G-10	Viton	-20 to +280	-29 to +138
Oxygen**	G-10	Teflon	-65 to +250	-54 to +121
Pentane	G-10	Teflon	+32 to +80	0 to +27
Propane	G-10	Nitrile or Teflon	+32 to +80	0 to +27
Propylene	G-10	Viton	+32 to +80	0 to +27
Sewage	G-10	Viton	-20 to +280	-29 to +138
Spent Liquor	G-10	Teflon	+32 to +100	0 to +38
Steam*	G-7*	Teflon	to +450	To +232
Steam	G-3	Teflon	to +392	To +200
Steam*	Yellow Jacket	No Seal	to +450* or +392	to +268* or +200
Styrene	G-10	Teflon	+32 to +80	0 to +27
Sulphur (Molten)	G-10	Teflon	+32 to +280	0 to +138
Toluene	G-10	Viton or Teflon	+32 to +150	0 to +66
Water (Hot)	G-10	Nitrile	+175 to +250	+79 to +121
Water (Potable)	G-10	Nitrile	+32 to +250	0 to +121
Water (Sea)	G-10	Nitrile	+32 to +250	0 to +121
White Liquor	G-10	Teflon	+80 to +280	+27 to +13