Davor Sdn Bhd
32-G, Jalan Puteri 5/16,
Bandar Puteri Puchong,
47100 Puchong,
Selangor, Malaysia.
+6011-26139527 (Office)
+6012-2919166 (Sales)
Davor Southern Touchpoint
13A, Jalan Kencana 1A/24,
Taman Pura Kencana,
83300 Batu Pahat,
Johor, Malaysia.

Lube-Tips - About Developer (Dye Penetrant Liquid)

29 Jun 2019
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Principle of developer
The role of developers is to draw the penetrant from the cracks out onto the surface to form visible indication. With visible penetrants, developers provide a white background so that red dye penetrant indications are easy to identify. The penetrant indication is not the actual size of the crack as the penetrant spreads through the developer over time. Specifications state minimum and maximum development times to address the spread of penetrant through developer. The minimum development time should allow enough time for penetrant to be pulled from the surface open flaw and spread on the part surface for enhanced visibility. The maximum development time is in place to minimize excessive penetrant “bleed out” from an indication that could potentially obscure the indication.
Types of Developers
1. Dry Powder Developers
Dry powder developers are fluffy white powders that may be applied manually with powder spray bulbs or spray guns or by dipping and dragging parts in the dry powder developer. Dry powder developers deposit a light dusting on the part surface and are only suitable for fluorescent penetrant inspections. Specifications prohibit the use of dry powder developers with visible dye penetrant inspections since dry powder developers would not provide an adequate white contrasting background for visible dye penetrants.

2. Water Soluble Developers
Water soluble developers are supplied in powder form and are mixed with water. Water soluble developers are only for use with fluorescent penetrants. Water soluble developers may not be used with visible dye penetrants because, like dry powder developers, water soluble developers do not produce an adequate white contrasting background that is necessary for visible dye penetrant inspection.

3. Water Suspendible Developers
Like water soluble developers, water suspendible developers are supplied in powder form and mixed with water. However, water suspendible developers do not dissolve in water. Instead, they form a developer suspension. The developer suspension must be continuously agitated to provide a consistent developer concentration. Water suspendible developers may be used with both fluorescent and visible dye penetrants since water suspendible developers produce a suitable white developer coating that enhances both visible dye and fluorescent penetrant indications.

4. Nonaqueous Developers
Nonaqueous developers are supplied ready to use. Spray is the preferred application method for nonaqueous developers, and aerosol cans are a convenient option. Nonaqueous developers contain white powders suspended in volatile solvents and require mixing prior to use. When applied by spray, the solvent evaporates and leaves a dry white developer coating on the part surface. Nonaqueous developers are suitable for both fluorescent and visible dye penetrant inspections.

5. Non-Aqueous Wet Developer Aerosols
Non-Aqueous wet developer aerosols are powder particles mixed with a quick drying solvent. The powder is suspended in the solvent and is sprayed onto a substrate. The solvent evaporates, leaving an opaque white coating and contrasting background for fluorescent and visible penetrant inspections.

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Email: sales@davor.com.my
Whatsapp: +6012 - 291 9166

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