Liquid penetrant testing reveals defects that break the surface of a component, across a wide range of materials — including the non-magnetic ones that magnetic particle testing cannot inspect.
How it works
The surface is cleaned and a penetrating liquid is applied, which is drawn into any surface-breaking discontinuity by capillary action during a dwell period. Excess penetrant is then removed from the surface and a developer is applied, which draws the trapped penetrant back out and spreads it — magnifying a defect that would otherwise be far too fine to see. Fluorescent penetrants are examined under ultraviolet light, which gives high contrast in a darkened inspection area.
Why it is specified
- It works on materials regardless of whether they are magnetic — stainless steels, aluminium and other alloys included.
- It handles complex shapes that would be awkward to inspect by other means.
- The equipment is portable, so it suits site work.
Limitations to be aware of
Only defects that are open to the surface can be found — anything subsurface will not show. The surface must be clean and non-porous, since contamination or a porous coating will either block the penetrant or produce misleading indications. For internal flaws, use ultrasonic or radiographic testing instead.
Liquid penetrant testing with CAST
We carry out liquid penetrant testing at our Bintulu facility and on site. It is the method we turn to for stainless steel, aluminium and other non-magnetic components, and for parts whose geometry makes other surface methods awkward. Surface preparation matters, so tell us the condition of the parts when you enquire.
Call +6086 348 938, email cast@ctne.com.my, or tell us about your inspection.