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White PTFE full-face flange gasket with eight bolt holes

Zoro Select

Zoro Select BULK-FG-1175 Full Face PTFE Flange Gasket

SKU CH-9Y75-NTZ0Z

PTFE full-face flange gasket for 4-inch ANSI Class 150 pipe, rated from -450 to 500 degrees F

  • PTFE material resists chemicals and extreme temperatures from -450 °F to 500 °F
  • Full-face design covers 4-inch ANSI Class 150 flanges with eight 3/4-inch bolt holes
  • 1/8-inch thickness provides reliable sealing for pipe connections
  • White PTFE construction contains no insert or binder materials
  • Metal-detectable gasket is not included with this product

Full-Face PTFE Gasket for 4" ANSI 150 Flanges

This full-face flange gasket is made from PTFE with no insert or binder material. It fits 4-inch pipe on ANSI Class 150 flanges and has an outside diameter of 9 inches with eight bolt holes of 3/4-inch diameter. The white gasket is 1/8 inch thick and is supplied new for industrial piping assemblies.

Temperature Range -450 °F to 500 °F

The single specification that determines suitability is the continuous operating window from -450 degrees Fahrenheit to 500 degrees Fahrenheit. PTFE construction provides chemical resistance across this span without a hardness rating or metal-detectable additive. Verify that your process media and pressure stay within these limits before installation.

Sustained Load Behaviour

Under sustained load the PTFE material will exhibit cold flow, gradually conforming to flange surfaces to maintain a seal over time. The lack of an insert or binder means creep relaxation is governed solely by the polymer. Bolt torque should be rechecked after initial thermal cycles to compensate for this relaxation.

Highlights

  • PTFE material resists chemicals and extreme temperatures from -450 °F to 500 °F
  • Full-face design covers 4-inch ANSI Class 150 flanges with eight 3/4-inch bolt holes
  • 1/8-inch thickness provides reliable sealing for pipe connections
  • White PTFE construction contains no insert or binder materials
  • Metal-detectable gasket is not included with this product

Specifications

BrandZORO SELECT

Questions about this item

How does the 500 °F maximum operating temperature hold up once the gasket is bolted in a real piping system?

The PTFE material is rated to 500 °F, so it will maintain its seal at that temperature provided the flange bolts and piping materials are also rated for the same heat.

What does the ANSI Class 150 rating actually cap for this 4-inch full-face gasket?

ANSI Class 150 defines the bolt-hole pattern and flange dimensions for this gasket; the pressure limit is set by the mating flanges, not the gasket itself.

What physical details must match for this gasket to fit and seal correctly?

The gasket needs a 4 1/2-inch inside diameter, 9-inch outside diameter, 1/8-inch thickness and eight 3/4-inch bolt holes on the Class 150 bolt circle.

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