Silrings, JIOrings’ composite PTFE seals
When unity is strength
JIOrings composite seals (known as Silrings) are a combination of the best of three materials: PTFE, bronze and NBR.
And it is the benefits of each of the three materials that make them unique gaskets, both for use in dynamic and static applications.
What is PTFE?
Polytetrafluoroethylene (PTFE) is an industrial-use plastic with a molecular composition that provides it with unique characteristics different from polyethylene, the most common plastic in daily use.
Best known by its trade name, Teflon® (registered trademark of Chemours Company), it is composed of fluorine and carbon and is one of the most resistant plastics to extreme temperatures and exposure to different chemical agents.
In the case of Silrings, the PTFE is complemented with mineral filler, more specifically 40% bronze.
Seals made of this combination are recommended for heavy work due to their resistance to wear and their hardness. They are often used in the following applications:
- Pneumatic, hydraulic and mechanical parts
- Manufacture of bushings and bearings in mechanical equipment
- Hydraulic system components
- Track rollers in the textile industry
- Ball joints and swivel joints in the automotive industry
How does bronze filler enhance the PTFE?
Bronze (Cu) by definition is all copper and tin alloy, in which the former is the base and the latter features in a proportion of three to twenty per cent. The addition of 40% bronze to PTFE has several positive effects on Silrings:
- It increases hardness and compressive strength
- It increases resistance to wear
- It improves thermal conductivity
- It improves dimensional stability
- It reduces cold flow
What role does the NBR play in all this?
In the case of Silrings, NBR O-rings (acrylonitrile-butadiene rubber) provide sealing and resistance to:
- Oils and greases based on mineral oils
- Aliphatic hydrocarbons
- Vegetable and animal oils and fats
- Hydraulic oils (H, H-L, H-LP)
- Hydraulic fluids (HFA, HFB, HFC)
- Silicone oils and silicone greases
- Water (maximum 80 °C)