Timing belts are made of a variety of materials, each with their own characteristics. Some of the most common materials used for timing belts include:

1. Rubber: Most timing belts are made of rubber, which is a flexible material that provides good traction and resists wear and tear. Rubber timing belts are often reinforced with fibers or cords to provide strength and durability.

2. Polyurethane: Polyurethane timing belts are more durable and resistant to wear and tear than standard rubber belts. They have a longer life expectancy and are often used in applications where high precision and reliability are required.

3. Fiber-reinforced elastomers: These timing belts are made by bonding rubber to a reinforced fiber material such as fiberglass or Kevlar. The fiber provides added strength and stiffness, making the timing belt more durable and resistant to stretch.

4. Steel-reinforced rubber belts: These belts have steel cords molded into the rubber to provide added strength and dimensional stability. They are often used in high-torque applications.

The characteristics of timing belts are also influenced by their tooth profile, which can be designed for specific applications. For example, trapezoidal timing belts are commonly used in power transmission applications, while curvilinear timing belts are used for high-precision motion control applications. Other characteristics of timing belts include their temperature resistance, chemical resistance, and resistance to oil and other contaminants.

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