Dye penetration method


The test surface must be dry prior to the application of non-aqueous or dry developers. It is important that a penetrant system match production requirements, not only to assure that specifications are met, but also to assure that sensitivity levels and inspection methods meet inspection criteria. If excess penetrant is not properly removed, once the developer is applied, it may leave a background in the developed area that can mask indications or defects. Caution - Fluorescent penetrant examination shall not follow a visible penetrant examination because visible dyes may cause deterioration or quenching of fluorescent dyes. The test-areas must be cool enough to prevent too repaid evaporation of the developer vehicle. Choice of developer is governed by penetrant compatibility one can't use water-soluble or -suspendable developer with water-washable penetrant , and by inspection conditions. At NDT Equipment Sales, we can assist you with the selection of proper penetrant and developer specific for your application.
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Dye Penetration Testing – Recent ASTM Enhancements

By Ken Shagagi T Liquid penetrant inspection is a nondestructive testing method that reveals surface breaking flaws by bleedout of a penetrating liquid colored with a visible or fluorescent dye from the flaw. Section with a normally not visible surface-breaking crack. While it is assuring to finally have a guideline in place for testing of non-porous packaging, our experience over the years shows that for porous packaging, method A has been consistent across a variety of package designs and therefore, is our preferred dye penetration test procedure. A Question for All Inspectors. Test Methods The only test method prior to the revision was Injection of the dye solution inside the package Method A. Dye penetration testing is a common method of checking for seal leaks in medical packaging such as pouches, trays, and blisters.
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Dye Penetration Testing - Recent ASTM Enhancements - Life Science Outsourcing, Inc.

An excellent historical summary of the development of test specimens for evaluating the performance of penetrant materials can be found in the following reference. Penetrants are then classified based on the strength or detectability of the indication that is produced for a number of very small and tight fatigue cracks. The dye is allowed to contact the sealed edge for up to five seconds. Total visual inspection time should be less than 20 seconds for a four sided package.
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Dye penetration method
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Dye penetrant inspection

Dye penetration method



Description: Practical Exam - hands-on demonstration of the student's ability to operate test equipment, perform specific calibrations and tests in order to find and report flaws of sample materials according to appropriate specifications. The use of written procedures has evolved, giving the ability for design engineers and manufacturers to get the high standard results from any properly trained and certified liquid penetrant testing technician. Today's penetrants are carefully formulated to produce the level of sensitivity desired by the inspector. After adequate penetration time has been allowed, the excess penetrant is removed and a developer is applied. Excess Penetrant is removed.

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