Star Shape Filter Bag for Vacuum Cleaner.
It is made of polyester fiber material.
Besides, it usually is PTFE coated.
1.Hydrolysis, Good chemical and Corrosion resistance.
2.High efficiency filtration, 99% at 0.5 microns ( PTFE coated ).
The filter efficiency is > 99% at 5 microns when it is not PTFE coated.
3.Can be customized.