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Properties of Penetrant Materials (Removability (Water Washable (Rinse…
Properties of Penetrant Materials
Removability
Water Washable
Rinse with water
Advantage: i. Ease of Use.
ii. Economical
iii.High level of sensitivity
Post-Emulsifiable, Lipophilic
Penetrant oil soluble, remove using oil-based emulsifier
Solvent Removable
Use solvent to remove penetrant
Post-Emulsifiable, Hydrophilic
Use water-soluble emusifier to remove excess penetrant
UV&Thermal Stability
Fluorescent materials lose brightness after exposed to UV
Excess heat will
i.alter wash chracteristic
ii.evaporate volatile constituents
Dimensional Threshold of Fluorescence
Determine the sensitivity of fluorescence
I = Io x e ^ -lCt
The absorption of light by a solution changes exponentially with the concentration of the solution
Color and Fluorescence Brightness
Dye must have good contrast against developer
Dye usually vibrant red
Brightness values usually determined for thick liquid films