Trinity NDT


Aerospace NDT | Welding Inspection | Training

Liquid penetrant is also known as Dye penetrant inspection uses Dye penetrants that is applied to surfaces and allowed to seep into surface opened discontinuities. After removal of excess penetrant the surface is then applied with developer that brings back the penetrant on to the surface due to blotting action of the developer. For better visibility and contrast with developer, penetrants are added with red color or fluorescent dyes. Penetrants are classified based on the sensitivity and method of excess penetrant removal.

Penetrants that can be removed by directly washing with water are called water washable penetrants. Penetrant the needs to be applied with emulsified after penetrant dwell time in order to make it water washable are called Post Emulsifiable penetrants. Penetrants that can be removed by solvents are called Solvent removable penetrants. Sensitivity and type of penetrant is selected based on applicable specifications, product codes and application of the components.

Trinity NDT sales and supplies only quality dye penetrant chemicals and accessories that are approved by various leading companies, Nuclear, Government and Defense organizations. The Dye penetrant chemicals will meet ASTM E 165, Pressure vessel codes, Nuclear, Aerospace and other national and international standards, codes and specifications

  1. Visible and fluorescent dye penetrants
  2. Solvents/cleaners for cleaning the test objects
  3. Dry/Wet /nonaqeuous developers
  4. Penetrant systems suitable for aerospace NDT applications
  5. Ni-Cr test panels
  6. Aluminium test blocks
  7. Lint free cloths
  8. Dye Penetrant systems suitable for mass production components
  9. Light meters- Lux meters, UV intensity checking meters
  10. Calibration of all types of Dye penetrant system gauges and accessories
 We provide various type of Liquid Dye Penetrants i.e. Visible Solvent Washable and Water Washable, Fluorescent Solvent Washable and Water Washable, Developers i.e. Solvent Suspendible for visible and Fluorescent, Post Emulsifiable and Dry Developer Powder, Remover i.e. Solvent Remover for visible and Fluorescent, Emulsifier (Hydrophilic), Emulsifier (Lipophilic) for crack detection required for Liquid Penetrant Inspection (LPI) for used extensively for detecting discontinuities that are open to surface such as cracks, seams, laps, cold shuts, laminations, though leaks, nonporous, non-metallic materials, both ferrous and non-ferrous.


Liquid Dye Penetrants meet requirements of ASTM E – 165, ASME Boiler & Pressure Vessel Code Section V Article 6, IS 12889, BS 3658.


Trinity NDT supplies Fluorescent Dye Penetrant Inspection System as per the demands of Aerospace and Engineering Industry. The DPT system is supported by facilities which make the Testing Reliable and Repeatable.

A typical system consists of a series of tanks having sizes tank size 1000 x 1000 x 600 mm for the following functions
  • Timers, Hooters and Electric Circuit are incorporated for controlling operations.
  • Water – Washable Fluorescent Penetrant Application & Dwell
  • Post-Emulsifiable Fluorescent Penetrant Application & Dwell
  • Water Rinse Station for Pre-rinse
  • Water Spray for Post-Rinsing of Emulsified Parts
  • Hot-Air Re-circulating Oven for Drying of Components
  • Enclosed Dust Chamber for Dry Powder Developer Application
  • Black Light Chamber for Examination

Equipments for DPT Inspection

DPT Consumables

UV Intensity Meter

Checking intensity of UV/ Black Light Bulb

Lux Meter

Checking intensity of White Light.

U. V. Goggles

Protection to eyes against UV radiations while inspecting.


Aluminum Comparator Blocks

Testing Sensitivity of the Penetrant and for comparison between Penetrants.

U. V. Black Light Assembly

Inspection in Dark Room for Fluorescent Penetrant

Lamp Holder

DPT testing


DPT bulb

UV Filter

UV Torch

U.V. Light Bulb