Abstract: The effect of temperature on the mechanical properties of PTFE， PPS， aramid， PAN and PET sewing threads for baghouse in the temperature range of 20 ~ 300℃ was studied using a powerful machine equipped with a heating box. The results showed that the experiment of hot stretching can better explain the effect of temperature on properties of the sewing thread under actual working conditions than that of cooling and re-stretching after baking. PTFE sewing thread is significantly affected by temperature. PPS sewing thread can still have good thermal stability at 240℃. Aramid sewing thread， although its strength is slightly lower， has good heat resistance ability with little strength changing. The strength of PAN sewing thread decreases sharply over 120℃. The mechanical properties of PET sewing thread are less affected by temperature， but cannot be used under high temperature. The mechanical behavior of each sewing thread is not the same under thermal conditions， but the overall strength is low. Because the high temperature soot trapping filter bag is affected by the external force caused by filtration and pulse jetting， the filter bag is much more likely to fail due to the break of the sewing thread.

Key words: baghouse, filter bag, sewing thread, thermal tension, mechanical property