PTFE sewing thread: 1) Specification: 600D, 1200D, 2400D 2) Material: pure PTFE PTFE sewing thread:1,200D is made through combining 400 twists and is suitable for sewing high temperature filter bags.600D is made with extra twist and can be woven as PTFE scrim. Other specifications can be made to customers' orders.Super quality, speedy delivery. PTFE Sewing Thread