... test fin evaporator coil Suitable for R134A, R22, R404A, R407C refrigerant and so on 1.material :copper , aluminum ,2.aluminum foil: hydrophilic or bare3.fin ... .producing procedure: tube bending, punching fin, expanding, digressing, dryingWelding, leakage test, bending, inspection, packingNote: for further information please contact us. aluminum fin evaporator coil