Zhangzhou Thermal Stability Dielectric Gasket

QS Gasket: Thermal Stability Dielectric Gasket

Name: Zhangzhou Thermal Stability Dielectric Gasket
Standard: ASME B16.5
Material: Gylon 3500
Temperature: -268℃ to 260℃
Size: 2-1/2 Inch
Pressure: 150LB
Complete Set: with G11 Sleeve and Washers and ZPS
Compound: with High-performance modified polytetrafluoroethylene

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Thermal Stability Dielectric Gasket 2-1/2"150LB is manufactured from aerospace-grade Gylon 3500 modified PTFE, exhibiting zero creep from cryogenic –268 °C up to 260 °C and certified to ASME B16.5. The 2-1/2-inch size, combined with a G11 insulation kit, delivers complete electrical isolation between flanges and withstands 150 LB pressure class. It is expressly designed for demanding services such as LNG lines, super-conducting equipment and high-voltage substations.

What are the principal advantages of Gylon 3500, and how does it differ from asbestos, rubber or other PTFE gaskets?
Gylon® 3500, developed by Garlock (U.S.), is a high-performance expanded PTFE (ePTFE) sheet material widely used in chemical, pharmaceutical, food and semiconductor industries where premium sealing and cleanliness are mandatory. Its key strengths are chemical inertness, the superior dielectric behaviour required by Thermal Stability Dielectric Gasket, wide temperature capability, low creep and reliable sealability.

First, Gylon 3500 offers near-universal media compatibility. It resists strong acids, alkalis and organic solvents across a broad pH range—far outperforming traditional asbestos or rubber gaskets. In concentrated sulphuric acid or sodium hydroxide, rubber ages and cracks, while asbestos, though fairly corrosion-resistant, poses health risks. Gylon 3500 remains stable below 260 °C, fully meeting the stringent demand of Thermal Stability Dielectric Gasket for consistent insulation and sealing at elevated temperature.

Second, its service window of –268 °C to +315 °C greatly exceeds most rubbers (typically –40 °C to +150 °C) and asbestos (high-temperature capable but brittle). In liquid-nitrogen duties rubber hardens and fails, whereas Gylon 3500 stays flexible, ensuring a leak-tight joint while maintaining steady dielectric properties—an essential index for high-end Thermal Stability Dielectric Gasket applications.

Third, unlike conventional PTFE gaskets, Gylon 3500 is produced by a proprietary process that creates a micro-porous ePTFE structure, markedly improving recovery and creep resistance. Standard PTFE under sustained bolt load suffers cold-flow (slow plastic deformation), leading to loss of bolt tension and increased leakage risk. The fibrillar network of Gylon 3500 effectively withstands cold-flow, making it suitable for frequent start-stop or thermal-cycling operation. In distillation-column flanges, for example, Gylon 3500 can seal for years without frequent replacement while continuously delivering dependable Thermal Stability Dielectric Gasket performance.

Moreover, Gylon 3500 contains no asbestos, heavy metals or extractables, and complies with FDA and USP Class VI, making it acceptable for food and pharmaceutical service. Asbestos is banned in many countries for its carcinogenicity, and rubber may leach additives into the medium.

In summary, Gylon 3500 surpasses asbestos, rubber and standard PTFE gaskets in safety, chemical stability, temperature range, dielectric behaviour and long-term sealing reliability, providing an ideal and fully compliant Thermal Stability Dielectric Gasket solution for high-end industry.

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