Dye Penetrant Testing
Dye Penetrant Testing (DPT) is widely used to detect surface-breaking flaws.
This non-destructive testing technique, also known as liquid penetrant inspection (LPI), is a cost-effective method used to locate surface-breaking flaws such as cracks, porosity, laps, seams, and other surface discontinuities. Dye penetrant inspection can be applied to both ferrous and non-ferrous materials and all non-porous materials (metals, plastics, or ceramics).
Dye Penetrant Testing (DPT / PT) reveals surface flaws by the “bleed-out” of a penetrating medium against a contrasting background.
This is done by applying a penetrant to the pre-cleaned surface and flaw of the item being inspected.
The penetrant liquid will be drawn into any surface opening by capillary action.
Following the removal of the excess penetrant, an application of a developer reverses the capillary action and draws the penetrant from the flaw.
The resultant indications reveal the presence of the flaw so that it can be visually inspected and evaluated.
The method is also useful for testing on-site as it is portable, and when applying certain techniques such as visible color contrast there is no need for additional resources such as electricity or water.
This makes it highly convenient for inspecting surface discontinuities.
HITS provides the following services with this technique:
- Visible Penetrants
- Fluorescent Penetrants
- High Temperatures Penetrants