Material			Length		*Micron rating	Core
N-	P	Polypropylene	-W-	250	-L-	1	P	Polypropylene
	A	Acrylic		500		3	S	SUS 304
	CN	Cotton natural		750		5
	CB	Cotton bleached		1000		10
						25
						50
						75
						100
						200

*nominal removal efficiency
Example: NPW-250L-5-P=NPW polypropylene wound cartridge, 250mmL, 5micron,
polypropylene core