PENETRANT FOR LUMINESCENT DEFECTOSCOPY Russian patent published in 1997 - IPC

FIELD: luminescent materials. SUBSTANCE: penetrant containing luminophores, - 4-aminonaphthalic acid N-phenylimide and 4-methyl-7-diethylaminocoumarin, wetting agent, - polyethylene glycol monoalkylphenyl ester, and solvent, - N-methylpyrrolidone has additionally polyethylene glycol monoalkyl ester and phosphoric acid tributyl ester at the following ratio of components, wt.-%: 4-aminonaphthalic acid N-phenylimide 0.8-0.9; 4-methyl-7-diethylaminocoumarin 0.2-0.3; polyethylene glycol monoalkylphenyl ester 4-6; polyethylene glycol monoalkyl ester 16-20; phosphoric acid tributyl ester 8-28, and N-methylpyrrolidone - the rest. EFFECT: enhanced sensitivity and safety (defect detection at 1 mcm), decreased fire hazard, improved removing from surface.