Oil-only sorbent socks and booms are primarily made from hydrophobic materials that repel water while absorbing oil and other hydrocarbons. The most common materials used include:
1. **Polypropylene**: This synthetic polymer is the most widely used material for oil-only sorbents. It is lightweight, highly absorbent, and can be manufactured in various forms such as fibers, mats, and woven fabrics. Polypropylene is oleophilic, meaning it attracts oil, and hydrophobic, meaning it repels water, making it ideal for oil spill response.
2. **Polyethylene**: Similar to polypropylene, polyethylene is another type of plastic polymer used in oil sorbents. It shares the hydrophobic and oleophilic properties necessary for effective oil absorption.
3. **Cellulose-based materials**: Some oil-only sorbents incorporate treated cellulose fibers. These natural fibers are chemically treated to enhance their oil absorption capabilities while maintaining water repellency.
4. **Natural fibers**: Certain natural fibers, such as cotton or wool, can be treated to become hydrophobic and oleophilic. These treated fibers are sometimes used in eco-friendly sorbents.
5. **Recycled materials**: Some manufacturers use recycled plastics or other materials to produce oil-only sorbents, contributing to sustainability efforts while maintaining performance.
These materials are often formed into various configurations, such as socks, booms, pads, and rolls, to suit different spill response needs. The choice of material and configuration depends on factors like the type of oil, the environment, and the scale of the spill.