Square Ring with PTFE Encapsulated
Square rings with PTFE encapsulation are high-performance sealing components designed for applications requiring both chemical resistance and elastic recovery. They consist of an elastomer core fully encapsulated by a seamless PTFE jacket, combined with a square or rectangular cross-section to ensure stable surface contact.
Compared with standard rubber square gaskets, PTFE encapsulated square rings offer superior resistance to aggressive chemicals, high temperatures, and permeation, while maintaining sealing force through the internal rubber core.
Structure & Sealing Principle
- PTFE Outer Jacket: Provides excellent chemical, corrosion, and temperature resistance
- Elastomer Core: Ensures elasticity, compression recovery, and sealing force
- Square Cross-Section: Maximizes contact area on flat or rectangular sealing surfaces
Sealing Advantage: The PTFE jacket isolates the elastomer from aggressive media, while the rubber core compensates for surface irregularities and thermal movement.
Encapsulation Types
Square PTFE encapsulated rings are typically available in the following constructions:
- FEP Encapsulated: Suitable for moderate temperatures and most chemicals
- PFA Encapsulated: Higher temperature resistance and improved durability
Selection Note: FEP encapsulation is cost-effective for general chemical service, while PFA is recommended for high-temperature or long-term demanding applications.
Core Material Options
Standard Elastomer Materials
| Material | Key Properties |
|---|---|
| NR | High elasticity, excellent tensile strength |
| SBR | Good abrasion resistance, cost-effective |
| NBR | Excellent oil and fuel resistance |
| CR | Weather, ozone, and flame resistant |
| EPDM | Outstanding weather, ozone, and water resistance |
| EPDM (Peroxide) | Improved heat resistance, low compression set |
| IIR | Very low gas permeability, excellent airtightness |
| XNBR | Enhanced abrasion and tear resistance |
| PU | Extremely high abrasion resistance, high load capacity |
| HNBR | Superior heat, oil, and chemical resistance |
| ACM | Excellent heat and oil resistance |
| VMQ | Wide temperature range, food & medical grade |
| FVMQ | Fuel and solvent resistant |
| FKM | Outstanding chemical and high-temperature resistance |
| TPR | Rubber-like elasticity, recyclable |
High-Performance Materials
- PTFE (Polytetrafluoroethylene, Teflon®)
- FFKM (Perfluoroelastomer)
Special Compound Options
- Internally lubricated rubber compounds
- (Paraffin / PTFE / Silicone / Graphite)
- Electrically conductive rubber compounds
- UL-approved rubber compounds
Key Performance Characteristics
- Outstanding chemical and solvent resistance
- Wide operating temperature range
- Low friction and non-stick surface
- Reduced risk of contamination
- Long service life under static sealing conditions
Typical Applications
- Chemical processing equipment
- Pharmaceutical and biotechnology systems
- Food and beverage processing
- Valves, pumps, and rectangular flanges
- Semiconductor and cleanroom equipment
Application Tip: PTFE encapsulated square rings are best suited for static sealing applications where chemical compatibility and cleanliness are critical.
About PTFE Encapsulated Square Rings
Best Seal manufactures and supplies PTFE encapsulated square rings in standard sizes and fully customized designs. Our products are engineered to meet demanding sealing requirements in chemical, sanitary, and industrial environments.
- Custom dimensions and cross-sections available
- FEP and PFA encapsulation options
- High-quality elastomer core selection
- Strict quality control and inspection
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Conclusion
Square rings with PTFE encapsulation combine the chemical resistance of PTFE with the resilience of elastomer cores. Their square profile ensures stable sealing on flat or rectangular interfaces, making them a reliable solution for high-purity and chemically aggressive applications.
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