Overview
PTFE gaskets are premium sealing components designed for flanged connections in chemical processing, pharmaceutical, and industrial piping systems. Manufactured from high-quality polytetrafluoroethylene (PTFE), these gaskets offer unparalleled chemical inertness, making them the ideal sealing solution for handling aggressive and corrosive fluids. OrroMFG produces precision-cut PTFE gaskets in a full range of standard and custom sizes, meeting ASME B16.20, EN 1514, and JIS flange standards for reliable performance in demanding industrial environments.
Our PTFE gasket product line includes solid PTFE gaskets, expanded PTFE (ePTFE) gaskets, and filled PTFE gaskets, each engineered for specific application requirements. Solid PTFE gaskets provide rigid, dimensionally stable sealing for high-pressure chemical service, while expanded PTFE gaskets offer superior conformability for uneven or damaged flange surfaces. Filled PTFE gaskets with glass, carbon, or barium sulfate fillers provide enhanced mechanical strength and creep resistance for elevated temperature and pressure applications. All our PTFE gaskets are manufactured from virgin PTFE resin, ensuring the highest level of chemical purity and performance consistency.
Key Features
- Unmatched Chemical Resistance: Resistant to virtually all industrial chemicals, acids, bases, solvents, and corrosive media across the entire pH range.
- Wide Temperature Range: Continuous operating temperature from -200°C to +260°C (-328°F to +500°F), suitable for both cryogenic and high-temperature process systems.
- Excellent Purity: Virgin PTFE meets FDA 21 CFR 177.1550 and USP Class VI requirements for food, beverage, and pharmaceutical applications.
- Low Creep and Cold Flow: Filled PTFE grades provide improved creep resistance compared to virgin PTFE for long-term sealing reliability.
- Weathering and Aging Resistance: Immune to UV radiation, ozone, and environmental aging for extended outdoor service life.
- Non-Stick Properties: Easy to remove during maintenance without residue buildup on flange surfaces.
Material Specifications
| Property | Virgin PTFE | Expanded PTFE | Glass-Filled PTFE (25%) | Carbon-Filled PTFE (25%) |
|---|---|---|---|---|
| Density (g/cm³) | 2.15 - 2.20 | 0.6 - 1.2 | 2.30 - 2.40 | 2.05 - 2.15 |
| Tensile Strength (MPa) | 20 - 30 | 5 - 15 | 22 - 28 | 20 - 26 |
| Elongation at Break (%) | 200 - 400 | 100 - 300 | 150 - 250 | 100 - 200 |
| Hardness (Shore D) | 50 - 60 | 20 - 40 | 60 - 70 | 55 - 65 |
| Continuous Service Temp (°C) | 260 | 260 | 260 | 280 |
| Compressive Strength (MPa) | 12 - 15 | 2 - 8 | 18 - 22 | 16 - 20 |
| Water Absorption (%) | < 0.01 | < 0.01 | < 0.02 | < 0.02 |
| Maximum Pressure (bar) | 100 | 40 | 150 | 150 |
| Thermal Conductivity (W/m·K) | 0.25 | 0.15 | 0.30 | 0.40 |
| Volume Resistivity (Ω·cm) | 10¹⁸ | 10¹⁸ | 10¹⁵ | 10¹² |
Applications
Chemical Processing Industry
PTFE gaskets are the gold standard for chemical processing plants, providing reliable sealing for pipelines, tanks, reactors, and process equipment handling corrosive chemicals. They are used with strong acids (sulfuric, hydrochloric, nitric), alkalis (caustic soda), solvents, chlorine, and reactive chemical intermediates. Typical flange applications include pump connections, valve connections, heat exchanger flanges, and reactor vessel nozzles.
Pharmaceutical and Biotechnology
FDA-compliant virgin PTFE gaskets are essential in pharmaceutical manufacturing and biotech processes where product purity and cleanability are critical. They are used in sterile piping systems, bioreactors, filtration equipment, and drug formulation systems. Expanded PTFE gaskets are particularly valued for sanitary flange connections due to their non-contaminating properties and ease of cleaning.
Oil and Gas
In refineries, petrochemical plants, and offshore platforms, PTFE gaskets provide reliable sealing for process piping, heat exchangers, and storage tank connections. Carbon-filled and glass-filled PTFE gaskets are preferred for high-pressure, high-temperature applications involving hydrocarbons, process chemicals, and sour service conditions.
Water and Wastewater Treatment
PTFE gaskets are used in water treatment facilities for chemical dosing systems, ultra-pure water distribution, and wastewater treatment processes. They are particularly suitable for flanged connections involving chlorine, ozone, and corrosive treatment chemicals.
Semiconductor Manufacturing
Ultra-high-purity PTFE gaskets are critical for semiconductor wet processing equipment and chemical delivery systems where even trace levels of contamination can cause product defects. They are used in ultra-pure water systems, chemical distribution lines, and process tool connections.
Operating Conditions
- Temperature Range: -200°C to +260°C (-328°F to +500°F) for virgin and filled PTFE; up to 280°C for carbon-filled grades
- Pressure Range: Up to 150 bar (2175 psi) for filled PTFE gaskets; up to 100 bar for virgin PTFE; up to 40 bar for expanded PTFE
- pH Range: 0-14, compatible with virtually all chemicals across the entire pH spectrum
- Flange Standards: ASME B16.5 Class 150-1500, EN 1092-1 PN 6-100, JIS 5K-63K
- Media Compatibility: Acids, bases, solvents, hydrocarbons, chemicals, steam, water, gases, cryogenic fluids
- Not Recommended For: Molten alkali metals, elemental fluorine at high pressure/temperature, and certain halogenated compounds
Material Comparison
| Material | Chemical Resistance | Temp Range | Pressure Rating | Creep Resistance | Cost | Best For |
|---|---|---|---|---|---|---|
| PTFE (filled) | Excellent | -200 to +260°C | Medium-High | Medium | Medium-High | Aggressive chemicals, wide temp range |
| EPDM | Good | -50 to +150°C | Low-Medium | Good | Low | Water service, HVAC, moderate chemicals |
| NBR (Nitrile) | Fair-Good | -30 to +120°C | Medium | Fair | Low | Petroleum oils, general industrial |
| Viton (FKM) | Excellent | -20 to +200°C | Medium | Very Good | High | High-temp chemicals, petroleum service |
| Graphite | Excellent | -200 to +500°C | High | Excellent | Medium-High | High-temperature, high-pressure steam |
| PTFE Envelope | Excellent | -40 to +200°C | Medium | Good | Medium | Chemical service with rubber core resilience |
Choose PTFE gaskets when:
- Maximum chemical resistance is required across the full pH range
- Operating temperatures exceed 150°C or go below -40°C
- FDA compliance or ultra-high purity is needed
- Non-stick and non-contaminating properties are essential
- The application involves aggressive or reactive chemicals
Customization Options
- Material Types: Virgin PTFE, expanded PTFE (ePTFE), 15-40% glass-filled, 15-25% carbon-filled, barium sulfate-filled, conductive/ESD grades
- Gasket Styles: Full-face gaskets, ring-type gaskets, RTJ-style PTFE gaskets, envelope gaskets, jacketed gaskets, and cut gaskets
- Size Range: 10mm to 3000mm diameter; standard pipe sizes from DN 10 to DN 2000 (1/2" to 80")
- Flange Standards: ASME B16.5, ASME B16.47, EN 1092-1, DIN 2690, JIS B2220, BS 1560, and custom flange patterns
- Thickness Options: 1.0mm, 1.5mm, 2.0mm, 3.0mm, 5.0mm, and custom thicknesses up to 50mm
- Tolerance Grades: Precision cut to IT8-IT10 tolerances with controlled thickness variation
- Surface Options: Smooth as-molded, etched, skived, and textured surfaces for specific sealing requirements
- Reinforcement Options: Stainless steel inserts, glass fabric reinforcement, and PTFE envelope with rubber core
- Color Identification: Natural white, black (carbon-filled), brown (bronze-filled), and custom colors
Quality Assurance
OrroMFG is committed to delivering PTFE gaskets of the highest quality and reliability. Our manufacturing facilities operate under ISO 9001:2015 certified quality management systems, with dedicated cleanroom production areas for high-purity semiconductor and pharmaceutical grade products. We source only premium PTFE resin from globally recognized suppliers, ensuring consistent material properties and batch-to-batch uniformity.
Each production lot undergoes rigorous quality testing including dimensional verification using coordinate measuring machines and optical comparators, thickness uniformity measurement, density testing, and hardness testing. Material composition is verified through FTIR spectroscopy and melt flow analysis. For critical applications, we perform leak testing at specified pressure-temperature conditions, compression testing, and chemical compatibility validation. Food-grade and medical-grade products come with FDA compliance declarations and USP Class VI certification where applicable. All gaskets are supplied with material test certificates, inspection reports, and full traceability documentation from raw material to finished product. Our commitment to quality ensures that every PTFE gasket delivers reliable, leak-free performance in the most demanding sealing applications.
