Gylon 3500 Extreme Service Gasket

QS Gasket: Gylon 3500 Extreme Service Gasket

Name: Gylon 3500 Extreme Service Gasket
Standard: ASME B16.5
Material: Gylon 3500
Temperature: -268℃ to 260℃
Size: 4 Inch
Pressure: 150LB
Complete Set: with G10 Sleeve and Washers and ZPS
Compound: with High-performance modified polytetrafluoroethylene

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Gylon 3500 Extreme Service Gasket is purpose-built for extreme duties: from –268 °C cryogenic cold to 260 °C heat, on a 4″ 150 LB flange, one single tightening delivers “zero-leak” performance.

Moulded to ASME B16.5 tolerances from highly modified PTFE Gylon 3500, it resists chemicals and creep, and ships as a complete “ready-to-fit” cartridge: G10 insulating sleeve, stainless steel washer and ZPS pre-assembly all in one kit—faster, safer installation.

It is the first-choice insulating/sealing solution for power generation, LNG, chlor-alkali and aerospace hardware, giving up to five times the life of an ordinary PTFE gasket and cutting both downtime and maintenance spend.

How is Gylon 3500 priced, and where does its value lie against other high-performance gaskets?
Gylon 3500 Extreme Service Gasket sits in the mid-to-high band of the high-performance non-metallic gasket market. Its initial purchase price is slightly above that of a standard PTFE gasket, but its outstanding field performance and long-term value make its total cost of ownership (TCO) far lower than legacy products.

First, the material itself: Gylon 3500 Extreme Service Gasket is produced from highly modified polytetrafluoroethylene whose molecular structure is engineered to retain excellent sealability and creep resistance across the full –268 °C to +260 °C window and in highly corrosive media. This advantage is most visible in extreme services—high temperature/high pressure, strong acids or bases, or cryogenic liquefied gases such as LNG, liquid oxygen and liquid nitrogen—where it prevents the leaks, shutdowns and safety incidents that gasket failure can cause.

Second, sealing life: traditional PTFE gaskets suffer cold-flow and stress-relaxation under sustained load, bolt preload drops and sealing performance fades. Gylon 3500 Extreme Service Gasket contains high-performance mineral fillers (silicates, barium sulphate, etc.) that raise compressive strength and recovery; after repeated thermal cycles and pressure surges it still maintains a tight seal. Field records show that, under identical conditions, the service life of Gylon 3500 Extreme Service Gasket is three-to-five times that of a conventional PTFE gasket. Over the life of the plant this means far fewer change-outs, less labour, less lost production and lower spares inventory.

Third, the “Complete Set” design boosts value even further. The gasket is delivered with the G10 insulating sleeve, stainless steel washer and ZPS pre-assembly system already in place, eliminating on-site fitting steps and removing the risk of seal failure caused by mismatched parts or poor assembly practice. For industries where safety and reliability are paramount—power, petrochemicals, LNG, chlor-alkali, aerospace—this “fit-and-forget” solution cuts installation time, reduces human error and raises overall system uptime.

Finally, Gylon 3500 Extreme Service Gasket meets the world’s strictest environmental and hygiene rules: FDA, EU 1935/2004, TA-Luft and others. It can therefore be used in food, pharmaceutical and semiconductor processes that demand high purity. Many low-price gaskets contain re-grind material or fall short of current legislation, exposing users to compliance penalties.

Taken together, the value message is “pay once, stay secure”. Although the piece price may be 30–50 % above that of a commodity gasket, the combined savings from lower leak rates, longer maintenance intervals, shorter shutdowns and avoided compliance risks typically repay the extra outlay within the first turnaround. For users who demand high reliability, low total cost and long, uninterrupted run lengths, Gylon 3500 Extreme Service Gasket is not just a sealing material—it is a strategic investment in continuous production and reduced operational risk.

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