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WHAT KIND OF RAW MATERIAL YOU USED FOR DUST FILTER BAG?

WHAT KIND OF RAW MATERIAL YOU USED FOR DUST FILTER BAG?
Update Time:2018-03-01
What kind of needle felt you use for dust filter bag?
The needle felt we used for dust filter bag:

Acrylic needle felt;
Acrylic coated needle felt;
PPS needle felt;
Water and oil repellent needle felt;
Polyester anti-static needle felt(yarn);
Polyester anti-static needle felt(blend yarn);
FNS needle felt;
Metamax needle felt;
PTFE needle felt;