1.good heat conduction 2.strong anticorrosive 3.long service life 4.nice appearance

material	specification	OD of fin	heat exchnageing area	height of fin	thickness of fin	distance between fin
carbon steel	18X2.0	38	0.57	10	0.3	4-5
carbon steel	21X2.0	51	0.68	15	0,.3	5-8
carbon steel	21X2.0	45	0.76	12	0.3	5-8
carbon steel	21X2.0	50	0.96	15	0.3	5-8
carbon steel	25X2.5	55	1	15	0.3	5-8
carbon steel	25X2.5	62	1.1	15	0.3	8-10
carbon steel	32X2.5	72	1.21	20	0.3	8-10

carbon steel fin tube circled with carbon steel fin