Polyester Fabrics

• They are similarly priced
• Their melting points are nearly identical (approx. 480°F, 295°C)
• They are similarly strong, with nylon having the edge.
• They are quick-drying and mildew resistant.
• Arguments exist on both sides about which fiber is better suited for UV resistance, and both will experience significant strength degradation over time with extended UV exposure.
• Because nylon modestly outperforms polyester in abrasion resistance testing and is easier to dye, nylon is favored in outdoor luggage and sports applications.
• Polyester is more resistant to stretching and shrinking than nylon, making nylon the preferred fiber for applications where stretch and shock resistance are required, such as in parachutes.
• Both fibers are relatively non-hydrophilic, but being less moisture absorbent polyester is preferred in many anti-wicking applications, such as substrates for pressure sensitive diaphragms.
• Both fibers retain their excellent properties under very low temperature conditions making either fiber an excellent candidate for upper and outer atmosphere applications.

DIFFERENCES: Where polyester and nylon diverge significantly is in their chemical behavior. They are chemical mirror images of each other. Polyester favors acidic environments (pH<7.0), while nylon favors alkaline environments (pH>7.0). Given exposure to the wrong chemical environment, either fiber will deteriorate rapidly, especially at elevated temperatures.