PTFE gaskets, because of its softness, large compression ratio, easy to shape in three-dimensional space, can be embedded into micro cracks and damages to repair and plug leaks, especially in the connection of acid, alkali, corrosion and non-metal equipment, large-diameter vessels The effect is outstanding, and it can effectively protect the device connection of brittle materials.
PTFE gaskets, because of its softness, large compression ratio, easy to shape in three-dimensional space, can be embedded into micro cracks and damages to repair and plug leaks, especially in the connection of acid, alkali, corrosion and non-metal equipment, large-diameter vessels The effect is outstanding, and it can effectively protect the device connection of brittle materials.
For non-metal devices such as glass, ceramics, graphite, plastics, etc., it has an extraordinary effect. It can compensate and balance errors caused by defects, mechanical processing, rigid deformation, installation misalignment, etc., balance the uneven preload force, and effectively solve the leakage problems of various facilities under complex conditions.
Types of PTFE gaskets
1. Pure PTFE gasket
Pure PTFE gaskets are flat gaskets, V-shaped gaskets, piston rings, ball valve gaskets, etc., which are mechanically turned or cut from PTFE rod, PTFE tube, and PTFE sheet, which is corrosion-resistant, anti-aging, and non-conductive. Good characteristics. It can have good mechanical strength between -100°C and 100°C.
Another feature of this product is that it is clean. For some substances that can come into contact with it, pure PTFE gaskets will not cause any pollution to them. This advantage makes it very widely used in food and medicine.
2. Modified PTFE gasket
This type of PTFE gasket includes two categories, graphite filled and glass fiber-filled.
Graphite-filled tetrafluoroethylene gasket is PTFE with graphite as filler for a full uniform mixing and then a high-temperature firing. This PTFE gasket has very good sealing and compressibility.
Glass fiber-filled PTFE gaskets use glass fiber as filler. This material has good recovery properties and is better than traditional materials in performance. It is both wear-resistant and chemical-resistant and is very suitable for paper and food industries.
3. Expanded PTFE Gasket
Expanded PTFE gaskets can resist cold flow and creep, and have the advantage of being easy to install, especially the ability to withstand ultra-low temperatures. The sealing performance of this material is very reliable, and it is also resistant to bursting. It is especially suitable for rough surfaces.
8 advantages of PTFE gasket
1. The PTFE gasket itself has high corrosion resistance, stable physical function, high and low-temperature resistance, and achieves its good sealing performance. By changing the tension force of the entangled steel belt, the density (hardness) of the entangled gasket can be changed to meet the needs of various applications. It is widely used in petrochemical, machinery, electric power, metallurgy, shipbuilding, medicine, atomic energy, and aerospace industries.
2. PTFE gaskets are weather-resistant, and PTFE has the best aging life among plastics. The PTFE gasket itself has high corrosion resistance, stable physical function, high and low-temperature resistance, and it has achieved good sealing performance. It is widely used in petroleum, chemical, pharmaceutical, electric power, and steel industries.
3. The PTFE gasket does not adhere. PTFE has the smallest surface tension among solid materials and does not adhere to any substances.
4. PTFE gaskets are resistant to low temperatures and have good mechanical toughness; even if the temperature drops to -196°C, they can maintain 5% elongation. It is suitable for sealing parts where temperature and pressure change drastically. It is a static sealing element for flange connections such as pipes, valves, pumps, heat exchangers, towers, manholes, and hand holes.
5. The functions and advantages of PTFE gaskets are as follows. The suitable medium includes almost all chemical components such as water, oil, acid solution, alkali solution, etc.
6. PTFE gasket is non-toxic and PTFE is physiologically inert, and it has no adverse reactions as artificial blood vessels and organs implanted in the body for a long time.
7. PTFE gaskets are resistant to corrosion, are inert to most chemicals and solvents, and can withstand strong acids and alkalis, water and various organic solvents. This gasket has good compression and resilience performance, multi-channel sealing, and certain self-tightening function, which can eliminate the influence of pressure, temperature changes, and mechanical vibration.
8. Under high temperature, low temperature, high vacuum, shock vibration, and other cyclical changes and various harsh conditions, maintain its excellent sealing performance. By changing the material combination of the gasket, the problem of chemical erosion of the gasket by various media can be solved. The flange surface is not bonded, which facilitates maintenance and replacement.
9. PTFE gaskets are resistant to high temperatures, and PTFE can be used at a working temperature of 250°C.
What factors should be considered when choosing PTFE gaskets
PTFE gaskets are used in many types of equipment. In order to ensure good performance, the factors to be considered in the selection of PTFE gaskets are as follows:
1. Medium: The question of the medium is relatively simple. Just need to pay attention to some special small questions, such as metallurgical work cylinders often use water-glycol and phosphate ester hydraulic oil.
2. Temperature: The cold-resistant NBR should be considered when the temperature is 20～-40℃. The general NBR material will harden the material under the low-temperature environment, resulting in leakage.
3. Impact pressure: When the construction machinery is started and closed, its impact pressure is much greater than the normal working pressure, so it is often used as the main seal with the impact resistance and squeezing gap HBY or SPGW with a pressure resistance of up to 70MPA.
Post time: Aug-06-2020