What is Penetrant Testing?

What is Penetrant Testing?
What is Penetrant Testing?

What is Penetrant Testing?

Penetrant testing (abbreviated as PT) is a nondestructive testing method for inspecting surface opening defects based on the principle of capillary action. This method is one of the five conventional nondestructive testing methods and is a comprehensive science and technology.

Like other nondestructive testing methods, penetrant testing is also based on the premise of not damaging the service performance of the tested object, and using the theories of physics, chemistry, material science and engineering to effectively test various engineering materials, parts and products, so as to evaluate their integrity, continuity, safety and reliability. Penetrant testing is an important means to realize quality control, save raw materials, improve technology and provide labor productivity in product manufacturing. It is also an indispensable means in equipment maintenance.

What is Penetrant Testing?

Penetrant testing can be widely used to detect the surface opening defects of most non absorbent materials, such as steel, non-ferrous metals, ceramics and plastics. It can also be used to comprehensively detect the defects with complex shapes at one time. It is mainly used to detect cracks, white spots, looseness, inclusions and other defects without additional equipment. For on-site detection, portable filling penetrant is often used, including penetrant, cleaning agent and developer, which is convenient for on-site use.

The working principle of penetrant testing is: after the workpiece surface is coated with penetrant containing fluorescent dye or colored dye, under the action of capillarity, the penetrant can penetrate into the surface opening defect after a certain time; Remove the excess penetrant on the surface of the workpiece, dry it, and then apply the adsorption medium developer on the surface of the workpiece; Similarly, under the capillary action, the developer will attract the penetrant in the defect, that is, the penetrant will seep back into the developer; Under a certain light source (black light or white light), the penetrant trace at the defect is displayed (yellow green fluorescence or bright red), so as to detect the morphology and distribution of the defect.

What is Penetrant Testing?

The results of penetrant testing are mainly affected by the operation of the operator, so the personnel conducting penetrant testing must operate in strict accordance with the relevant process standards, procedures and technical requirements, so as to ensure the reliability of the test results.

Stainless Steel Pipe/Tube Products:

MTSCO – Austenitic / Duplex steel / Nickel alloy

– To be the most reliable industrial metal service provider in the world

Who MTSCO is?

MTSCO established in 2006, during many years development, nowbecomes a large and professional industrial piping system provider, serving customers from more than 100 countries and regions.

MTSCO - Austenitic / Duplex steel / Nickel alloy
MTSCO – Austenitic / Duplex steel / Nickel alloy

What products can we provide?

MTSCO - Austenitic / Duplex steel / Nickel alloy
MTSCO – Austenitic / Duplex steel / Nickel alloy
MTSCO - Austenitic / Duplex steel / Nickel alloy
MTSCO – Austenitic / Duplex steel / Nickel alloy

What materials can we provide?


304/L/H/N, 316/L/H/N/Ti, 321/H, 309/H, 310S, 347/H, 317/L904L

Duplex steel

31803, 32205, 32750, 32760

Nickel alloy

Alloy B/ N10001, Alloy B2/N10665, Alloy B3/N10675, Alloy C4/N06455, Alloy C22/N06022, Alloy C276/N10276, Alloy C2000/N06200, Alloy G35/N06035, Alloy G30/N06030,
Alloy S/N06635, Alloy N/N10003, Alloy X/N06002, Alloy 188/R30188, Alloy 230/N06230,
Alloy 556/R30556, Alloy 600/ N06600, Alloy 601/N06601, Alloy 617/N06617,
Alloy 625/N06625, Alloy 718/N07718, Alloy X750/N07750, Alloy 800/N08800,
Alloy 800H/N08810, Alloy 800HT/N08811, Alloy 825/N08825, Alloy 925/N09925,
Alloy 926/N08926, Alloy 400/ N04400, Alloy K500/N05500
Precipitation-hardening Steels: 254SMO/S31254, 17-4PH, 17-7PH, 15-7PH
Nickel: N4/UNS N02201, N6/UNS N02200

How can MTSCO service customers?

MTSCO’s ISO9001 Quality System is issued by TUV. Our full and professional inspection reports contain two parts, one is self-inspection of the requirements beyond ISO9001, which is 100% inspected by our own QC; another is 100% inspected by professional QC teams.

MTSCO - Austenitic / Duplex steel / Nickel alloy
MTSCO – Austenitic / Duplex steel / Nickel alloy

Thank you very much for reading this, I wonder if my presentation will help you with your current problem? Looking forward to hearing from you!


1. Can you provide samples?

Of course, We can provide a few sample tubes for you to inspect and experiment.

2. Can we mark our logo on the product?


3. What is your packing?

Woven bags/Wooden boxes/Wooden reel/Iron reel and other packaging methods.

4. What inspection will you do?

In addition to routine surface and dimensional inspection. We can also do tensile, hardness and chemical composition analysis, and NDT like ultrasonic, eddy current, hydraulic testing.

5. What certificates do you have?


6. What is your minimum order quantity(MOQ)?

According to different types of products, you can consult for details.

7. How long is your delivery time?

Products in stock: Within 5-7 days.

Customized products: 30-90 days, which is determined according to the product category.

8. What is your terms of payment?

T/T, L/C,O/A,D/P……

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