Polytetrafluoroethylene (PTFE) O-rings have the same shape as general synthetic rubber O-rings. The whole process is processed by CNC turning without molds. Any size and quantity can meet customer needs. This O-ring is often used for strong acid and alkali corrosion and high-temperature or low-temperature medium seals. It can replace fluorine rubber rings and other rubber rings. High pressure resistant, not corrosion resistant and not high temperature resistant medium seal, widely used in aerospace, food, chemical and medical machinery fields. The materials that our company can make include various rubber materials (NBR, FKM, FFKM, SIL, EPDM, HNBR, CI, etc.), various polyurethane materials (oil resistance, hydrolysis resistance, high temperature resistance, food grade, ultra-wear resistance, etc.), various engineering plastics (PTFE, PTFE composite, ultra-high molecular polyethylene, PA, POM, phenolic resin, etc.) and metal materials.

keyword：Tetrafluoro series Engineering plastics series Rubber series Metal series

Products Detail

Parameters

The internal open type is suitable for internal positive pressure conditions. The C-ring is a typical self-sealing structure. When the medium pressure enters the C-ring in the working state, the pressure self-tightening effect is generated on the C-ring from the inside to the outside, that is, the greater the system pressure, the better the sealing effect. Due to the principle of opening and self-sealing, it is only necessary to overcome the elasticity of the sealing ring itself during installation, so a very ideal sealing effect can be obtained without using a large pre-tightening force. Our company adopts INCONEL 718 alloy to manufacture.

Features of PTFE

Polytetrafluoroethylene (PTFE or F4 for short) is one of the most corrosion-resistant materials in the world today. It is not corroded by known acids, alkalis, salts, and oxidants, even the most powerful aqua regia (a mixture of concentrated sulfuric acid and concentrated nitric acid) is helpless to it, hence the name Plastic King. It can be used normally between -150 and +250°C, which other plastics cannot do. The characteristic of polytetrafluoroethylene is that it is difficult to melt, and its fluidity is very poor, so it cannot be processed by an extruder, and it is generally sintered. PTFE has good wear resistance and self-lubricating properties, and is a high-grade engineering plastic. PTFE is white, has a large specific gravity, and does not burn. It does not melt when heated above 250°C, which is the difference between it and nylon.

Advantages of PTFE

● Very high and low temperature resistance, the working temperature can reach up to 250℃. Even if the temperature drops to -196°C, it can maintain an elongation of 5%;
● Corrosion resistance, strong acid and alkali resistance, various organic solvents;
● High lubricity, which is the one with the lowest friction coefficient among solid materials;
● Non-adhesive, possesses the lowest surface tension among solid materials;
● The property of electric insulator can resist 1500 volt high voltage.

Finally, in terms of design, it is recommended that the elasticity of the PTFE sealing ring is small, so when selecting the size specification, it should match the nominal diameter (piston or inner hole). Axial installation is easier, while radial installation is recommended to use separate grooves.