Dye Penetrant Testing

How Dye Penetrants Work

  1. The tested item is cleaned first before the penetrant is applied by dipping, spraying or brushing. The penetrant is given time to soak into any defects, the penetration time dependent on the chosen penetrant and customer requirement.
  2.  The excess penetrant is removed and the component is dried depending on the process used. Then a developer is applied. The developer helps to draw the penetrant out of the flaw and onto the surface to form a visible indication. A visual inspection is then performed by the inspector under ultraviolet or white light, depending on the type of penetrant used (fluorescent or visible colour contrast).
  3. If the defect is located in a weld seam or lapped joint, a repair can be carried out and the penetrant test repeated to assure the crack defect is eliminated.

The majority of dye enetrat products are oil based but newer environmentally firendly products have been produced utilizing water-oil emulsifiers for water based cleanup. Penetrants are classified by their sensitivity levels and, when selecting a penetrant, factors such as environment under which the test is to be performed, surface finish, size of defects sought and size of test piece are considered.

Nova offers both visible dyes and fluorescent dyes for use in most penetrant formulations including solvent or emulsion type. The following Nova products are highly concentrated liquid dyes which offer the highest sensitivity in DPI.

Novaflour Red 525

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Novasolve Red 564

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Novasolve Blue 200

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