Set of plastic (PEEK) split rings for input shaft JATCO JF011E, JF016E, JF017E - 28.50 x 25.20 x 1.70 (2 rings included)

• Thickness - 1.70 mm;
• Outer diameter - 28.50 mm;
• Inner diameter - 35.20 mm;

PEEK (Polyetheretherketone) is a high-tech semicrystalline thermoplastic classified as a super-engineering polymer. In industry, particularly in hydraulics, oil and gas, and automotive applications (e.g., transmission components), PEEK sealing rings are used where standard materials cannot withstand extreme loads.

What are PEEK seals?

Unlike soft elastomers or Teflon, PEEK is a rigid, highly durable material. O-rings made from it are often made as protective (anti-extrusion) rings or rigid dynamic seals. They retain their mechanical properties at temperatures at which other plastics begin to melt or deform.

Advantages of PEEK over Teflon (PTFE) O-rings

Although Teflon (PTFE) is renowned for its record-low coefficient of friction, it has significant drawbacks that PEEK successfully eliminates:

1. Resistance to cold flow (creep)

• PTFE: Under constant load, Teflon has the tendency to "leak" out of the gap or deform over time, even at room temperature.

• PEEK: Possesses tremendous rigidity and dimensional stability. It does not deform under high pressure, making it ideal for use as support rings.

2. Mechanical strength and wear resistance

• PTFE: Easily scratched and worn by abrasive particles.

• PEEK: Extremely resistant to abrasion and mechanical damage. Its tensile strength is significantly higher than that of Teflon.

3. Working at ultra-high pressure

Thanks to its hardness, PEEK can withstand pressures that would simply squeeze a Teflon ring into the gaps between components (extrusion effect). This is critical for deep-sea equipment or high-pressure hydraulics.

4. Temperature stability

Although both materials are chemically resistant, PEEK maintains structural integrity at temperatures up to 250°C (and briefly higher), while Teflon becomes too soft to perform load-bearing functions at high temperatures.

Comparison table