Plymouth Tube Co.’s Salisbury Mill has attained Nadcap accreditation for both heat treating and material testing laboratories. The Salisbury mill is the first North American tubing manufacturer to earn the dual accreditation from Nadcap for seamless stainless aerospace tubing. Nadcap accreditation is becoming accepted as the standard in the worldwide aerospace industry. The audits at Plymouth Tube – Salisbury were performed by the Performance Review Institute. In addition to Nadcap, the Salisbury mill is also certified under ISO9001:2008 and AS9100 surveillance (International Aerospace Quality Management Systems). To meet these standards, process controls and testing procedures are utilized to insure proper heat treatment of materials, eliminating the chance of inner granular corrosion thereby reducing the risk of field failures.