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PSI GasketSeal® Sealing Gaskets
Grooves and half "O" rings in the retainer
eliminate
the need for grooves in the mating surfaces.
 GasketSeal® Sealing Gaskets
are considered to be one of the most effective methods for sealing
mating surfaces of all types. The gasket consists of two molded half
“O” rings (with precise crown-to-void ratio) mounted in grooves on
opposite sides of a retainer. While maintaining all the advantages
of a full “O” ring seal, the half “O” rings eliminate the need for
sealing grooves in the mating surfaces, which also eliminates
positioning and alignment concerns. GasketSeal gaskets are available
in a wide variety of retainer and sealing element combinations for
matching gaskets to service and environmental conditions.
Near zero "M" and "Y" factors make it
possible to effect a positive seal without the tremendous bolt loads
required with flat gaskets. Low compressive loads on the gasket
allows the use of lighter weight and lower pressure rated flanges
where permitted.
Unique features of
the GasketSeal® 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 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 GasketSeal®
Works
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Before Tightening
The flange faces come
into contact with the crown of the sealing elements. As the
flange is tightened the crowns are compressed into the
molded-in voids in the sealing elements, resulting in a seal
that will maintain positive, dynamic contact against the
flange faces under all conditions.
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After Tightening
The flange faces have
come into firm contact with the retainer, thus encapsulating
the sealing elements within grooves and guarding them from
exposure to external environments or internal media. At the
same time, the elastic memory characteristics of the
confined sealing elements results in zero “m” and “y”
factors, making it possible to effect and maintain a
positive seal at the lowest possible compressive load.
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Wide Choice of
Gasket Materials
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Metal Retainer
Materials |
Insulating Retainer
Materials |
Sealing
Elements |
Aluminum
Brass
Carpenter 20
Carbon Steel
Cast Iron
Clad Steel Materials
Copper
Ductile Iron
Hastelloy B, C, X
Inconel X
Monel
Nickel 200
Soft Iron
Stainless Steel
Tantalum
Tin
Titanium
Vanadium |
Ceramic
Epoxy Glass
Glass
Lucite
Melamine
Phenolic
Polyester Glass
Polyethylene
Silicone Glass
Vinyl |
Buna-N (Nitrile)
Buna-S
Butyl
EPDM
Hypolon
Kel-F
Natural Rubbers
Neoprene
Nylon
Polyurethane
Silicone Rubber
Viton® ® DuPont |
Suggested
Sealing Gasket Material Compatibility
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Medium |
Retainer |
Seal |
Temperature
Range °F |
Temperature Range °C
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Acetone |
Phenolic |
Nitrile |
+32 to +80 |
0 to +27 |
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Air |
G-10 |
Nitrile |
-65 to +225 |
-54 to +107 |
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Carbon Dioxide |
G-10 |
Nitrile |
+32 to +150 |
0 to +66 |
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Ethanol |
G-10 |
Nitrile |
+32 to +100 |
0 to +38 |
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Fuel Oil |
G-10 |
Viton |
-20 to +280 |
-29 to +138 |
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Gas, Natural |
Phenolic |
Nitrile |
-65 to +220 |
-54 to +104 |
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Gas, Sour |
Phenolic |
Viton |
-20 to +220 |
-29 to +104 |
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Gasoline |
G-10 |
Teflon |
-65 to +225 |
54 to +107 |
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Hydrogen |
G-10 |
Nitrile |
-65 to +250 |
-54 to +121 |
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Jet Fuel |
G-10 |
Viton |
-20 to +225 |
-29 to +107 |
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Nitrogen |
Phenolic |
Nitrile |
-65 to +220 |
-54 to +104 |
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Oil, Crude |
G-10 |
Viton |
-20 to +280 |
-29 to +138 |
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Propane |
G-10 |
Nitrile or Teflon |
+32 to +80 |
0 to +27 |
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Propylene |
G-10 |
Viton |
+32 to +80 |
0 to +27 |
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Sewage |
G-10 |
Viton |
-20 to +280 |
-29 to +138 |
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Toluene |
G-10 |
Viton or Teflon |
+32 to +150 |
0 to +66 |
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Water (Hot) |
G-10 |
Nitrile |
+175 to +250 |
+79 to +121 |
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Water (Potable) |
G-10 |
Nitrile |
+32 to +250 |
0 to +121 |
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Water (Sea) |
G-10 |
Nitrile |
+32 to +250 |
0 to +121 |
General Notes:
The foregoing performance data are intended as guidelines only.
Performance suitability for any specific applications should be
determined by the user. Variation in temperature, pressure,
concentration or mixtures acting synergistically may preclude
suggested service use. Material selection is at the sole risk of
the user. Consult with a specialist for specific applications.
PSI's responsibilities will be limited to those listed in the
PSI standard warranties.
Metal Retainers:
GasketSeal gaskets are available with a wide range of metal
retainers to offer compatibility with flange metals, for
extremely hazardous fluids, or for extremes in temperatures and
pressures. Please contact Corrosion Control Products Company.
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Physical
Properties
GasketSear® and 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.
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ASTM |
Test
Parameter |
Plain
Phenolic |
Neo-Faced
Phenolic |
G3
Hi-Temp
Phenolic |
G-7*
Silicone
Glass |
G-10
Epoxy
Glass |
G-11
Epoxy
Glass |
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D149 |
Dielectric Strength
Volts/mil (short time) |
500 |
500 |
500 |
350-400 |
550 |
550 |
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D695 |
Compressive Strength (psi) |
25,000 |
25,000 |
50,000 |
40,000 |
50,000 |
50,000+ |
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D229 |
Water Absorption (%) |
1.6 |
1.6 |
0.7 |
0.07 |
0.10 |
0.10 |
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D257 |
Insulation
Resistance (MOhms) |
40,000 |
40,000 |
46,000 |
2,500 |
200,000 |
200,000 |
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D790 |
Flexural Strength (psi) |
22,500 |
22,500 |
60,000 |
27,000 |
60,000 |
75,000+ |
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D785 |
Hardness Rockwell "M" |
85 |
85 |
115 |
105 |
115 |
115 |
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D256 |
IZOD
Impact Strength
(ft-lbs/inch) |
1.2 |
1.2 |
12.0 |
8.0 |
14.0 |
12.0 |
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D638 |
Tensile Strength (psi) |
20,000 |
20,000 |
42,000 |
25,000 |
45,000 |
43,000 |
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D732 |
Shear Strength (psi) |
10,000 |
10,000 |
18,000 |
20,000 |
22,000 |
22,000 |
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Operating Temperature,
degrees F |
-65 to
+220°F |
-65 to
+175°F |
-65
to
+392°F |
Cryogenic
to
+450°F |
Cryogenic
to
+280°F |
Cryogenic
to
+349°F |
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Operating Temperature,
degrees C |
-54 to
+121°C |
-54 to
+79°C |
-54 to
+200°C |
Cryogenic
to
+138°C |
Cryogenic
to
+280°C |
Cryogenic
to
+176°C |
* G-7 material should not be used with hydrocarbons, not even
trace amounts.
Seal Element
Temperature Limits
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Nitrile |
Viton |
Teflon |
Neoprene |
EPDM |
| -65 to
+250°F |
-20 to
+350°F |
Cryogenic
to +450°F |
-40 to
+175°F |
-65 to
+300°F |
| -54 to
+121°C |
-29 to
+177°C |
Cryogenic
to +232°C |
-40 to
+79°C |
-54 to
+149°C |
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