... superior strength and resistant to sunlight and abrasion spun polyester threads. Spun polyester threads are made by spinning together lengths of ... , silicone, and silicone-free) may be applied to spun polyester thread to enhance the sewing performance for specific applications. Spun ... as denim. Specification: 20S/2, 20S/3, 30S/2, 30S/3, 40S/2, 40S/3, 50S/2, 50S/3, 60S/2, 60S/3 polyester sewing thread