The Advantages And Disadvantages Of PTFE Seals
Jan 15, 2022
Due to the different environment and conditions of the sealing ring, the medium of the rubber seal material used is different, which also determines the different environments and occasions for the use and application of the developed and produced sealing ring. In the sealing industry, several kinds of rubber seal materials are commonly used in the research and development and production of sealing rings. The rubber types include nitrile rubber seals, acrylates and fluororubber seals, and the seal materials that can be selected other than rubber are silicone rubber, polyurethane, hydrogenated nitrile rubber, PTFE rubber seals (for the lip part of the sealing ring), etc.
PTFE is generally called "non-stick coating" or "easy-to-clean material". This material is resistant to acid, alkali, and various solvents, and is almost insoluble in all solvents.
2. What are the characteristics of the sealing rings produced by PTE?
PTFE has a high degree of chemical stability and good chemical inertness, strong acid and alkali or strong fluorinating agents and solvents do not work on it; good thermal stability, the cracking temperature is above 400 degrees Celsius, and it has a wide range of work. Temperature range, can work normally in the temperature range of -200 degrees Celsius to 300 degrees Celsius, in ultra-low temperature occasions, it must be it; good wear reduction, the friction coefficient between PTF seals and materials is 0.1 to 0.2.The dry friction coefficient between the metal and the metal is 0.1 to 0.3, and it is 0.02-0.04 in the case of liquid lubrication. The coefficient of static and static friction is relatively small, and the coefficient of static friction is almost the same as that of the dynamic friction system. The material table of PTFE seals. It has outstanding surface self-lubrication, and almost all viscous substances cannot adhere to its surface; allow normal use in high-speed occasions and environments, the surface linear speed of PTFE sealing ring can be as high as 30 to 33m/s, as long as there is splash oil lubrication Occasion and working environment, it can even be as high as 43m/s, the rubber sealing ring is only allowed to be less than 10m/s, and PTFE has a "memory" function.
3. What are the disadvantages of the sealing ring developed by PTFE?
The production cost is high, the process is complex, and it lacks high elasticity. Especially when the sealing ring is in a liquid such as water quality, the amount of wear is large, and the service life is not enough.
4. What industries are the sealing rings produced by PTFE used in?
PTFE sealing rings are mainly used in the field of weapon industry, hydraulic and pneumatic systems, and oil pipes in the petroleum industry: reciprocating and rotating shaft sealing rings, combined with rubber elastomers to make combined sealing rings.
