Magnetic Particle Inspection is used to locate surface and near subsurface defects in ferromagnetic materials. In a similar way to penetrant testing, there are two main methods for detecting imperfections under inspection using magnetic products:
•Black inks that are visible against the white of white contrast paints;
•Fluorescent inks that show any imperfections under ultra violet (UV) light.
However, the magnetic testing process does not use the penetrant, cleaner/remover and developer method, instead incorporating a one part or two part method for defect detection.
Ardrox black magnetic inks are designed for the high sensitivity inspection of ferro-magnetic materials and ensure reliable indications of surface and near-surface sub-surface defects alongside the use of Ardrox white contrast paints. These inks consist of black iron oxide with a controlled particle size, in a high flash, low aromatic petroleum distillate and have a solid content between 1.2 and 2.4 ml/100 ml according to ASME Code V Article 7.
Ardrox fluorescent magnetic inks are used for the detection of surface and near-surface sub-surface defects in ferro-magnetic materials under UV(A) light. These inks are available as powder (which can easily be dispersed in a carrier oil), ready-for-use fluid or as water-based fluid concentrate.
Alongside the Ardrox name, Chemetall also supply Supramor, Ferramor and Lumor branded products to suit a variety of applications.