A 3-layer composite bushing refers to a type of bushing composed of three layers or components. This design is commonly used in various mechanical and electrical applications to provide insulation, reduce friction, and support rotating or sliding components.

The three layers typically found in a composite bushing are:

1. Inner Layer: The innermost layer of the bushing is usually made of a low-friction material such as PTFE (polytetrafluoroethylene) or a similar polymer. This layer allows for smooth movement and reduces friction between the rotating or sliding components.
2. Intermediate Layer: The intermediate layer provides structural support and may be made of materials like bronze, steel, or another durable material. This layer helps distribute the load and adds strength to the bushing.
3. Outer Layer: The outermost layer of the composite bushing acts as an insulator and protects the inner layers from environmental factors such as moisture, dust, or contaminants. It is typically made of materials like rubber, plastic, or thermoplastic elastomers (TPE) to provide insulation and resist wear.

By combining these three layers, a composite bushing can offer improved performance compared to a single-layer bushing. The low-friction inner layer reduces friction and wear, the intermediate layer provides strength and load distribution, and the outer layer offers insulation and protection.

Composite bushings find applications in various industries, including automotive, aerospace, electronics, and industrial machinery. They are commonly used in bearings, bushings, hinges, and other components that require smooth movement, durability, and insulation.