Metal Corrugated Reinforced PTFE envelope Gasket (TEFLON + STAINLESS STEEL) Product Description
The metal corrugated reinforced PTFE envelope Gasket is a composite sealing component that combines the excellent chemical stability of polytetrafluoroethylene (TEFLON) and the high-strength support of stainless steel. With its unique "corrugated structure + double-layer material" design, it becomes an ideal sealing solution for harsh working conditions in chemical, petroleum, pharmaceutical and other industries.
I. Core Materials: Scientific Integration of Dual Advantages
1、Surface Layer: Polytetrafluoroethylene (TEFLON)
As the direct contact layer of the sealing surface, PTFE material has the characteristic of "the king of corrosion resistance" — it can withstand an extreme temperature range from -200℃ to 260℃, and has no chemical reaction with strong acids (such as hydrochloric acid, sulfuric acid), strong alkalis (such as sodium hydroxide), strong oxidants and various organic solvents, completely solving the leakage problem of traditional gaskets caused by corrosion. At the same time, its ultra-low friction coefficient (only 0.04) can reduce the wear of the sealing surface, and its non-stick surface can avoid medium residue, meeting the cleanliness requirements of the food and pharmaceutical industries.
2、Base Material: Stainless Steel
The corrugated tooth base made of 304 or 316L stainless steel provides strong structural support for the product. The high-strength property of stainless steel (tensile strength ≥ 520MPa) can resist compressive deformation under high-pressure working conditions, while the corrugated tooth design compensates for minor unevenness of the flange surface through the "elastic buffer layer" effect. Even in scenarios with vibration or temperature fluctuation, it can still maintain stable sealing specific pressure, avoiding sealing failure caused by excessive rigidity of the base material.
II. Structural Design: Sealing Innovation of Corrugated Tooth Technology
The product adopts a composite structure of "stainless steel corrugated tooth base + PTFE coating". The peak-valley spacing of the corrugated is precisely calculated (conventional tooth height: 0.2-0.5mm, tooth pitch: 1-3mm), forming multiple sealing cavities:
- When the flange bolts are tightened, the PTFE surface layer will produce "stepwise deformation" with the compression of the corrugated tooth structure. While filling the flange gap, the peak of the corrugated forms line contact sealing with the flange surface, greatly improving the sealing specific pressure;
- The corrugated tooth structure of the stainless steel base can effectively disperse pressure, avoiding cold flow phenomenon of PTFE caused by excessive local stress, and prolonging the sealing life;
- The overall structure has both flexibility and rigidity, which can adapt to slight misalignment of the flange during installation, reducing installation difficulty.
III. Performance Characteristics: Core Advantages for Harsh Working Conditions
1. Wide Temperature Range Sealing: Maintains stable sealing performance in the range of -200℃ (cryogenic working condition) to 260℃ (high-temperature working condition), suitable for scenarios such as refrigeration equipment and high-temperature reaction kettles;
2. High-Pressure Resistance: Relying on the support of the stainless steel base, it can withstand a maximum working pressure of 30MPa, meeting the sealing needs of oil pipelines and high-pressure valves;
3. Chemical Inertness: The PTFE surface layer has no corrosion or swelling to almost all chemical media (except molten alkali metals and chlorine trifluoride), suitable for chemical acid-base transportation pipelines;
4. Long-Term Stability: The corrugated tooth structure reduces the cold flow and creep of PTFE, and the attenuation rate of sealing performance is less than 5% during long-term use (conventional service life: 3-5 years);
5. Environmental Compliance: The material meets the standards of FDA (U.S. Food and Drug Administration) and RoHS (EU Restriction of Hazardous Substances), and can be used in fields such as food processing and drinking water treatment.
IV. Application Scenarios and Installation & Maintenance
(I) Typical Application Scenarios
- Chemical Industry: Flanges of acid-base storage tanks, feed inlets of reaction kettles, sealing end covers of chemical pumps;
- Petroleum Industry: Valves of oil transmission pipelines, manholes of crude oil storage tanks, sealing surfaces of oil-gas separators;
- Pharmaceutical Industry: Pharmaceutical liquid transmission pipelines, aseptic reaction tanks, sealing doors of freeze dryers;
- Energy Industry: Cooling systems of nuclear power plants, high-temperature steam pipelines of thermal power plants, production equipment for photovoltaic silicon materials.
(II) Installation and Maintenance Points
- Before installation, clean the flange surface, remove oil stains, impurities and residues of old gaskets to avoid affecting the sealing effect;
2. When tightening the bolts, adopt the "diagonal step-by-step tightening" method to ensure uniform force on the gasket, avoiding damage to the PTFE surface layer due to local over-tightening;
3. If slight leakage occurs after long-term use, properly retighten the bolts (retightening torque shall not exceed 10% of the initial torque) without replacing the new gasket;
4. When the medium temperature exceeds 200℃, it is recommended to check the sealing status every 6 months to ensure no deformation of the corrugated tooth structure.
Through "material complementarity + structural innovation", the metal corrugated reinforced PTFE envelope Gasket perfectly solves the pain point of traditional gaskets being "corrosion-resistant but not pressure-resistant, or pressure-resistant but not corrosion-resistant". It has become a high-end product with both reliability and adaptability in the modern industrial sealing field, providing safe and long-term sealing guarantees for various harsh working conditions.