produce various specifications of sheet metal parts for air condtioner and heat pumps. Populace Group is one ... tons punching machines, welding machine, polish machinesProcessed materialstainless steel, copper, carbon steel (according to customer's requirement)Surface treatmentHot galvanized, ... , IPQC, FQC, QACertificateISO9001-2008 sheet metal parts for air conditioner and heat pumps