C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
150/4
C09K 11/06 (2006.01)
Patent
CA 1039161
ABSTRACT OF THE DISCLOSURE A water washable substantially biodegradable dye penetrant composition having good sensitivity and high stability, for use in non-destructive testing of objects to locate voids and defects therein, said composition consisting essentially of an organic dye, preferably a fluorescent dye, and a carrier or solvent for said dye, in the form of certain straight chain, primary, aliphatic oxyalkylated alcohols, particularly the bio- degradable surfactants comprised of the nonionic condensation products of linear primary aliphatic alcohols having from 10 to 18 carbon atoms, with ethylene oxide and propylene oxide, prefer- ably in the form of a mixture thereof. In the method of applica- tion of the dye penetrant composition, such composition is applied to the surface of an object containing cracks and flaws, water is applied to the surface of the object to remove excess liquid dye penetrant composition from the surface without removing such penetrant from the cracks and defects, and with or without a developer, the surface of the object is viewed under suitable lighting conditions, e.g. ultraviolet or black light when the dye in the penetrant is a fluorescent dye, to locate any cracks or defects in the surface of the body as indicated by colored traces from the dye penetrant remaining in the cracks and flaws.
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