Polyester and rubber bungee cords differ primarily in material composition, elasticity, durability, weather resistance, and applications.
1. **Material Composition**:
   - **Polyester Bungee Cords**: Made from polyester fibers, these cords have a braided or woven outer sheath with an elastic core.
   - **Rubber Bungee Cords**: Composed of natural or synthetic rubber, these cords are typically more elastic and have a smooth or braided outer layer.
2. **Elasticity**:
   - **Polyester**: Offers moderate elasticity, providing controlled stretch and rebound. It is less elastic than rubber, making it suitable for applications requiring limited stretch.
   - **Rubber**: Highly elastic, allowing for significant stretch and rebound. This makes rubber bungee cords ideal for applications needing high flexibility and tension.
3. **Durability**:
   - **Polyester**: Known for its strength and resistance to abrasion, UV rays, and chemicals. It maintains its integrity over time, even with repeated use.
   - **Rubber**: While initially strong, rubber can degrade over time, especially when exposed to UV light and harsh weather conditions. It may become brittle and lose elasticity.
4. **Weather Resistance**:
   - **Polyester**: Excellent resistance to weather elements, including UV rays and moisture, making it suitable for outdoor use.
   - **Rubber**: Susceptible to weathering, particularly from UV exposure, which can lead to cracking and reduced lifespan.
5. **Applications**:
   - **Polyester**: Used in applications where controlled stretch and durability are needed, such as securing cargo, tents, and tarps.
   - **Rubber**: Preferred for tasks requiring high elasticity, like securing lightweight items or providing tension in dynamic environments.
In summary, polyester bungee cords are favored for their durability and weather resistance, while rubber bungee cords are chosen for their superior elasticity.