Liquid Penetrant (PT)

Liquid penetrant (PT) also called dye penetrant is an inexpensive Nondestructive testing technique which can be easily performed by qualified certified inspectors. Different NDT Codes, Specifications and Procedures require the inspection to be performed in a particular manner. Each has their own particular requirements to be followed. Depending on the critical nature of the part, an inspector performing Liquid penetrant (PT) should be qualified and certified to a Level 1,2, or 3 per an NDT qualification and certification procedure such as SNT-TC-1A or NAS-410.

  • Fluorescent (Type 1)
  • Visible (Type 2)