Air filter foam is classified into 8PPI~100PPI Polyethylene (Ester, Ether) by size of cell.
It is used for every home articles.
8 ~ 34PPI :
Air conditioner, Ceramic Filter, Dry stand for Aircraft fuel
tank, vacuum cleaner filter.
40 ~ 50PPI : Small engine, Evaporative cooler, Automobile brightener (Wax), Ear Phone,
Stereo Speaker etc.
55 ~ 85PPI : Medical equipment, Paint Spray, Booth, Spongy-gourd, Bathing towel, Filter
of oil refinery, Power puff, Fuel tank etc.
95 ~ 100PPI : Motorcycle air filter, Power puff, Filter of oil refinery, Fuel tank etc.

Air filter foam is classified into 8PPI~100PPI Polyethylene (Ester, Ether) by size of cell.
It is used for every home articles.
8 ~ 34PPI :
Air conditioner, Ceramic Filter, Dry stand for Aircraft fuel
tank, vacuum cleaner filter.
40 ~ 50PPI : Small engine, Evaporative cooler, Automobile brightener (Wax), Ear Phone,
Stereo Speaker etc.
55 ~ 85PPI : Medical equipment, Paint Spray, Booth, Spongy-gourd, Bathing towel, Filter
of oil refinery, Power puff, Fuel tank etc.
95 ~ 100PPI : Motorcycle air filter, Power puff, Filter of oil refinery, Fuel tank etc.