Non Destructive Testing (NDT) is an inspection method that does not permanently alter the article being inspected, making it a highly-valuable technique that can save both time and money in product evaluation, troubleshooting, and research.

DCI Aerotech offers the following NDT inspection methods:

Liquid Penetrant Inspection (LPI)

LPI uses capillary action for fluid to enter a clean, dry surface. Penetrant is applied by dipping, spraying, or brushing. Excess penetrant is removed, and a developer is applied to make indications visible. Inspection is done under ultraviolet or white light, depending on the dye.


FPI is used to detect surface defects in materials by applying a fluorescent dye to the surface and then examining it under ultraviolet light. The dye penetrates into any surface cracks or flaws, making them visible under the UV light and allowing for accurate defect identification.

Magnetic Particle Inspection (MPI)

MPI is a method to find defects in ferrous materials using a magnetic field or electric current. Iron oxide particles are attracted to defects, making them visible for inspection. It can also be done using dry particles and white light.


DCI Aerotech offers the following services in conjunction with NDT:


Used to reveal surface defects or discontinuities in metallic materials by applying a solution of nitric acid and alcohol to the surface, which reacts with the material and highlights any irregularities.

Pre-Penetrant Etch

Uses either acid or caustic solutions to remove 0.0001″ to 0.0002″ of material from the part’s surface. This will allow the penetrant inspector to properly evaluate any surface indications that may have been hidden during the manufacturing process.


A final treatment used after LPI or MPI to create a passive layer that is free from all contaminants, such as machine metal, that may cause corrosion or failure throughout the life of the component.

Temper Etch Inspection

Visual examination of a component’s surface after chemical etching with a nitric acid solution. It aims to detect harmful changes in the microstructure caused by overheating during surface grinding.