4 Steps to Identify a Fake Gylon 3500 Insulation Gasket

Fig. 1. Genuine Gylon 3500 sheet: smooth, flat cutting surface.

• Brand logo and product model printed clearly on the sheet face.
• Place of origin and thickness marked alongside the model number.
• Uniform light tan color across the whole sheet.
• Dense surface texture, smooth cut face, no voids or delamination.

Performance Data: Temperature, Pressure and PxT

Gylon 3500 handles strong acids and solvents because of its silica-filled modified PTFE formulation. Genuine grades cover -268 to 260 °C and up to 1200 psi (about 83 bar). Always ask for a detailed data sheet and check the PxT value (pressure x temperature): a 1/16-inch sheet should show a maximum of 350,000 °F x PSIG, and 1/8-inch sheet 250,000 °F x PSIG (about 8,600 bar x °C). Vague data or measured values far below these limits suggest an inferior substitute; claims far above them are just as suspect, because the performance ceiling of modified PTFE is set by its materials science.

Table 1. Data points to verify against the supplier data sheet; values apply to standard grades.

Supplier Qualifications and Traceability Documents

The fastest way to separate genuine from fake is the source. Garlock runs a strict global network of authorized distributors, and legitimate channels ship with original manufacturer certificates, material test reports and compliance statements for standards such as ABS or FDA. Check the authorized distributor list on Garlock's official site, or ask the supplier for a distribution authorization letter. Be careful with prices far below market, unknown origins and sellers who cannot produce traceability documents — a verbal authenticity guarantee is not evidence.

• Original manufacturer certificate for the batch.
• Material test report matching the values on the data sheet.
• Compliance statements for standards such as ABS or FDA.
• Distribution authorization from the manufacturer where requested.

Field Performance: Torque Retention and Chemical Resistance

Genuine Gylon 3500 holds bolt torque well: after installation it resists creep relaxation and keeps sealing pressure on the pipe flanges. Early leaks, repeated bolt tightening or heavy cold-flow extrusion at disassembly all point to a counterfeit. Chemical resistance gives the second verdict — after contact with strong acids, hydrocarbons or chlorine, genuine material does not turn sticky on the surface, dissolve, or harden and crack. Significant attack by the process medium means the material is not what it claims to be.

Frequently Asked Questions

What temperature and pressure range does genuine Gylon 3500 cover?

Standard grades run from -268 to 260 °C and up to 1200 psi (about 83 bar). Values outside that envelope need written justification from the manufacturer.

What PxT limits should a data sheet show?

350,000 °F x PSIG for 1/16-inch sheet and 250,000 °F x PSIG (about 8,600 bar x °C) for 1/8-inch sheet. A missing or vague PxT line is a warning sign.

Why does gasket color matter when checking authenticity?

Genuine sheet is a uniform light tan. Darker or lighter shades, missing brand prints or blurry markings suggest the sheet did not come from Garlock's process.

Which documents should accompany a genuine shipment?

An original manufacturer certificate, a material test report that matches the data sheet, and compliance statements for standards such as ABS or FDA.

What field behaviour points to a counterfeit?

Leaks soon after installation, repeated bolt tightening, severe cold-flow extrusion on removal, or surface stickiness, dissolution or cracking after contact with acids, hydrocarbons or chlorine.