INDUSTRIAL GASKETS & SEALING SOLUTIONS

INDUSTRIAL GASKETS & SEALING SOLUTIONS

Flexitallic

Flexitallic

Flexitallic

Flexitallic SIGMA 500

Flexitallic SIGMA 500

Flexitallic SIGMA 500

Flexitallic SIGMA 500 is a biaxially oriented PTFE industrial gasket sheet filled with hollow glass microspheres. Its compressible structure allows for effective flange sealing even with limited bolt load.

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Manufacturer Documentation

Our Quebec facility manufactures custom-cut flat gaskets to your exact specifications. VAMECA can also evaluate the supply of this part number or engineer a suitable replacement.

AT A GLANCE

Modified / Filled PTFE

Product Family

PTFE

Material Composition

Biaxially oriented PTFE filled with hollow glass microspheres

TECHNICAL SPECIFICATIONS

TECHNICAL SPECIFICATIONS

Material Specifications

Material Specifications

Maximum temperature and pressure limits cannot be applied simultaneously.

TEMPERATURE

Up to 260°C depending on the SIGMA brochure specifications and operating conditions

PRESSURE

Maximum catalog rating by thickness: 85 bar (≤ 1.5 mm), 80 bar (2 mm), 75 bar (3 mm)

THICKNESSES

0.75 to 3 mm (as per brochure)

Applications and Key Features

Industrial flanges with moderate bolt loads, compatible chemical applications, and slightly irregular sealing surfaces, subject to operating condition limits.

Published Testing and Approvals

Standards, Testing, and Certification References

Tests published in the SIGMA brochure, without cross-certification from other grades.

PART NUMBER ANALYSIS

To properly select or replace this material

To properly select or replace this material

To properly select or replace this material

PTFE Construction and Benefits for Flanges

SIGMA 500 is a biaxially oriented PTFE sheet material filled with hollow glass microspheres. Its typical density of 1.4 g/cm³ and ASTM F36 compressibility of 35% set it apart from denser silica- or barium sulphate-filled PTFE materials. Published recovery reaches 44% under the brochure's test conditions. For a 1.5 mm thickness, the brochure reports an ASME gasket factor m of 1.4, a minimum seating stress y of 13 MPa, and an EN 13555 Qmin/0.01 of 16 MPa. ASTM F38 creep relaxation is 31%. These parameters are derived from specific test methods and do not represent universal assembly criteria.

Applications and Selection Limits

This construction can be considered when bolt loading is moderate or when flange sealing faces exhibit minor imperfections. The SIGMA brochure indicates a temperature range up to 260°C and maximum pressures that vary depending on thickness. Maximum values must not be combined without verifying the pressure-temperature curve and the actual service fluid.

Key Considerations Prior to Replacement

The microsphere filler enhances compressibility, but does not guarantee the same chemical compatibility as silica- or baryte-filled PTFE grades. Verify concentration, continuous operating temperature, flange face condition, dimensions, and bolt torque. Do not assume approvals carry over from another SIGMA grade.

Similar construction references to review: Garlock GYLON 3504 and TEADIT TEALON TF 1570. These are structural comparisons, not certified equivalents.

PTFE Construction and Benefits for Flanges

SIGMA 500 is a biaxially oriented PTFE sheet material filled with hollow glass microspheres. Its typical density of 1.4 g/cm³ and ASTM F36 compressibility of 35% set it apart from denser silica- or barium sulphate-filled PTFE materials. Published recovery reaches 44% under the brochure's test conditions. For a 1.5 mm thickness, the brochure reports an ASME gasket factor m of 1.4, a minimum seating stress y of 13 MPa, and an EN 13555 Qmin/0.01 of 16 MPa. ASTM F38 creep relaxation is 31%. These parameters are derived from specific test methods and do not represent universal assembly criteria.

Applications and Selection Limits

This construction can be considered when bolt loading is moderate or when flange sealing faces exhibit minor imperfections. The SIGMA brochure indicates a temperature range up to 260°C and maximum pressures that vary depending on thickness. Maximum values must not be combined without verifying the pressure-temperature curve and the actual service fluid.

Key Considerations Prior to Replacement

The microsphere filler enhances compressibility, but does not guarantee the same chemical compatibility as silica- or baryte-filled PTFE grades. Verify concentration, continuous operating temperature, flange face condition, dimensions, and bolt torque. Do not assume approvals carry over from another SIGMA grade.

Similar construction references to review: Garlock GYLON 3504 and TEADIT TEALON TF 1570. These are structural comparisons, not certified equivalents.

REPLACEMENT TO BE EVALUATED

REPLACEMENT TO BE EVALUATED

Compare designs and alternatives

Compare designs and alternatives

KEY COMPARISON CRITERIA

Comparable to glass microsphere-filled PTFE materials, notably GYLON 3504 and TEALON TF 1570. Filler types, manufacturing processes, and torque specifications remain specific to each product reference.

Need this gasket, custom cutting, or a replacement?

Part Number: Flexitallic SIGMA 500

Please provide the part number, thickness, dimensions, quantity, and process fluid. We will review material availability for the specified grade, custom cutting at our Quebec facility, or an engineered alternative tailored to your assembly.

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View official documentation

View official documentation

The manufacturer's latest datasheets, certifications, and P/T curves must be reviewed prior to ordering or substitution.

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RELATED PART NUMBERS

RELATED PART NUMBERS

Compare Related Designs

Compare Related Designs

Compare microsphere fillers and bolt-load torque retention performance. Chemical formulations and compliance certifications vary. Engineering specifications for referenced equivalents: GYLON 3504 (filled / restructured PTFE), TEADIT TEALON TF 1570 (glass microsphere-filled PTFE), and top-chem 2003 (hollow glass microsphere-filled PTFE).

REFERENCE SHEET

KLINGER

KLINGER top-chem 2003

Hollow glass microsphere-filled PTFE

View Specifications →

REFERENCE SHEET

TEADIT

TEADIT TEALON TF 1570

Glass microsphere-filled PTFE

View Specifications →

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