DANBURY, Conn.--(BUSINESS WIRE)--Praxair, Inc. (NYSE:PX), today announced that its Praxair Surface Technologies coating service center in Changzhou, China, recently received Nadcap (National Aerospace and Defense Contractors Accreditation Program) accreditation for coatings. Nadcap is a global cooperative program that brings together technical experts from among prime contractors, suppliers and government representatives to work jointly to establish requirements for approval of suppliers using