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Flange Isolation Gaskets and Isolation Kits as manufactured by
Central Plastics Company are used throughout the world and in numerous Cathodic Protection Industry applications.
Flange Isolation Kits have a proven track record for being one of the most effective and reliable products for
controlling and maintaining the integrity of piping and tank systems under demanding conditions.
Gaskets are available for delivery individually or in kits. The material a gasket consists
of includes Nitrile-Face, Plain Phenolic, G10 and Durlon.
Type E - Full Face Gasket completely covers the flange face from the flange bed to the
outside diameter. A Full Face Gasket is used on flat-faced flanges; however,
it can be used with a raised flat-face flange to prevent debris from building up in raised
areas, thus causing a short.
Type F - Ring Gasket is designed to set inside the bolt circle and is commonly used with raised face flanges.
Type D - Ring Type Joint (RTJ) is an oval phenolic gasket designed to work specifically with
RTJ grooved flanges. The RTJ gaskets are sized by R-number.
Type D - BX Gasket is an octagonal-shaped phenolic gasket designed to work specifically with
a BX grooved flange. BX gaskets are machined from phenolic tubing and withstand pressures up to 15,000 PSI.
“Jock” O - Ring Type Gasket is either a Full Face (Type E) or Ring Gasket (
Type F) configuration. The “Jock” has a high energy O-Ring elastomer seal that compresses and
expands to fill any voids as the flange is tightened; the completely encapsulated sealing element prevents
a gasket blow-out. The O-Ring provides a positive, constant seal with zero environmental leakage. Complete
contact of flange and retainer prevents fire failure and reduces exposure of the seal to service fluids and the
environment. The “Jock” O-Ring gasket is available in Nitrile or Viton seal material.
Isolation Sleeves are designed to be easily inserted in the bolt hole, leaving ample room
for the bolt, even when the bolt holes are misaligned. The wall thickness is
1⁄32” (0.79 mm)
and can be provided for bolt sizes from ½” (12.7 mm) to 3 ½” (88.9 mm).
The material a sleeve consists of Mylar, High Density Polyethylene, Minlon or/and Nomex.
Standard Isolation Washers are manufactured from CE Phenolic, whereas other Washer materials include Steel, G3, G7 or G10.
They are available as a single washer and sleeve kit, a one-piece washer kit, a double washer kit
or a one-piece double washer kit (Minlon).
The maximum operating temperature of a Phenolic Washer is approximately 225° F (107° C),
with a compression strength of 36,400 PSI and a dielectric strength of 300 VPM.
The G3 and G7 high temperature Isolation Washer has a maximum operating temperature of 450° F (232° C).
Molded One-Piece Sleeve & Washer contributes to reduced handling (many loose parts)
and make-up problems in the field. A one-piece sleeve and washer is generally used for one-side flange
insulation, however, it can be cut to size for two-side insulation.
A Minlon material is used because of its high compression strength and superior toughness.
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