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Penetrant Testing (LPT)

Penetrant Testing (PT), also known as dye penetrant testing, is based on the capillary action that causes a liquid to rise when confined to a small opening and the surface wetting property. The penetrant that rises to the surface after application and removal of excess can indicate surface-breaking anomalies.

Given its convenience of usage and minimal equipment requirements, EIWAA’s DPT services are extensively applicable to detect discontinuities in a variety of assets.

Our professionals execute Penetrant Inspection on equipment with a wide range of shapes, sizes, and materials, in a variety of industries, including


As a standard technique, the temperature of the penetrant and the surface of the part to be processed shall not be below40º degree F (5ºC) and not above 125º degree F (52ºC) throughout the examination period. Local heating and cooling are permitted provided the part temperature remains in the range of 40º degree F (5ºC) nor above 125º degree F (52ºC).

Penetrant may be applied by dipping, brushing, or spraying. Filters shall be used on the upstream side of the air inlet when using compressed air to apply penetrant.

The length of time the penetrant must remain on the part to allow proper penetration shall be as recommended by the penetrant manufacturer.
Procedure for Solvent-Removable Fluorescent Penetrant Examination

Temperature Limit 40° to 125°F (5°C to 52°C)
Surface  Conditioning Prior to Penetrant Inspection As   welded,   cast,   rolled,   forged   condition   unless   otherwise instructed.
Pre clean Approved solvent cleaner.  Allow to dry minimum 5 minutes prior to proceeding with the test.
Penetrant Materials

(Attachment V)

Solvent Removable Fluorescent Dry Developer

Aqueous Developer

Non-Aqueous Developer

Penetrant Application Depending on whether penetrant is supplied in bulk containers or aerosol cans, application can be by dipping, brushing, flooding, or spraying.
Penetrant Dwell Time 10 to 20 minutes depending on defect sought per Table 1.
Excess            Penetrant


Remove penetrant with a dry, clean, lint free cloth or paper towel, followed by moistened clean, lint free, white cloth or paper towel.

For final removal of excess penetrant use a dry, lint free white cloth or paper towel.

Developer Application Spray at 250mm to 300mm (10″ to 12″) from the surface.   If

Aqueous (water based) developer is used, flood the surface and allow to dry.

Inspection Lighting Black Light – 1000 µW/cm² – 3000 µ W/cm²

White Light – Maximum = 2 ftc

Post Cleaning Wipe surface clean with dry cloth.  Flush surface with an approved solvent cleaner.    Wipe  as  required  with  a  clean  cloth  and/or absorbent paper towel.