Which two threads are commonly used in parachute sewing and what are their properties?

Which two threads are commonly used in parachute sewing and what are their properties?

• A. Cotton thread for strength and nylon for UV resistance.
• B. Bonded nylon thread for strength and abrasion resistance; polyester thread for UV resistance and durability.
• C. Silk thread for high friction; wool thread for warmth.
• D. Polypropylene thread for elasticity; metal thread for strength.

Answer: (B)

In parachute sewing, you want threads that handle both high loads and outdoor exposure. Bonded nylon provides exceptional strength and abrasion resistance; the bonding coats the thread to reduce friction, resist wear, and prevent linting as it runs through fabric and through hardware under load. This makes it ideal for the main seam lines that endure the most stress. Polyester, on the other hand, offers superb UV resistance and durability; it holds up against sun exposure, weathering, and repeated use, while typically having low stretch, which helps maintain seam shape and integrity over time. Using these two together gives you a combination of strength where it’s most needed and long-term environmental resilience. Cotton isn’t strong enough for parachute seams and can soak up moisture, Silk and wool don’t provide the necessary abrasion resistance or outdoor durability, polypropylene lacks the needed strength and wear resistance, and metal thread is impractical and unsafe for parachute construction.

In parachute sewing, you want threads that handle both high loads and outdoor exposure. Bonded nylon provides exceptional strength and abrasion resistance; the bonding coats the thread to reduce friction, resist wear, and prevent linting as it runs through fabric and through hardware under load. This makes it ideal for the main seam lines that endure the most stress. Polyester, on the other hand, offers superb UV resistance and durability; it holds up against sun exposure, weathering, and repeated use, while typically having low stretch, which helps maintain seam shape and integrity over time. Using these two together gives you a combination of strength where it’s most needed and long-term environmental resilience.

Cotton isn’t strong enough for parachute seams and can soak up moisture, Silk and wool don’t provide the necessary abrasion resistance or outdoor durability, polypropylene lacks the needed strength and wear resistance, and metal thread is impractical and unsafe for parachute construction.