This document (EN ISO 3452-1:2013) has been prepared by Technical Committee CEN/TC 138 "Nondestructive testing", the secretariat of which is held by AFNOR (France), in collaboration with Technical Committee ISO/TC 135 "Non-destructive testing". The responsible German body involved in its preparation is Working Committee NA 062-08-25 AA "Oberflächenverfahren" ("Surface methods") of the Materials Testing Standards Committee (NMP) at DIN. This part of ISO 3452 specifies a method of penetrant testing used to detect discontinuities, such as cracks, laps, folds, porosity and lack of fusion, which are open to the surface of the material to be tested. It is mainly applied to metallic materials, but can also be performed on other materials, provided that they are inert to the test media and not excessively porous (castings, forgings, welds, ceramics, etcetera). The standard also includes requirements for process and control testing, but is not intended for the application of acceptance criteria and gives neither information on the suitability of individual test systems for specific applications nor requirements for test equipment.