Dye penetrant composition containing a volatile degreaser-type solvent

Claim 2

A LIQUID DYE PENETRANT COMPOSITION FOR USE IN NONDESTRUCTIVE TESTING FOR DETECTING CRACKS AND FLAWS IN A SPECIMEN SURFACE, WHICH CONSISTS ESSENTIALLY OF ABOUT 0.2% TO ABOUT 45% BY VOLUME OF AN N-ALKYL-2-PYRROLIDONE, SAID ALKYL GROUP CONTAINING FROM 1 TO 4 CARBON ATOMS, A DYE WHICH IS SOLUBLE IN SAID PYRROLIDONE, THE RATIO OF SAID DYE TO SAID PYRROLIDONE IN SAID COMPOSITION RANGING FROM ABOUT 1 PART OF DYE TO ABOUT 25 PARTS OF PYRROLIDONE, TO ABOUT 2 PARTS OF SAID DYE TO ABOUT 1 PARTS OF PYRROLIDONE, BY VOLUME, AND ABOUT 50 TO ABOUT 97% BY VOLUME OF SAID DYE PENETRANT COMPOSITION, OF A VOLATILE SOLVENT SELECTED FROM THE GROUP CONSISTING OF 1,1,1-TRICHLOROETHANE, TRICHLOROETHYLENE, 1,1,2-TRICHLORO-1,2,2-TRIFLUOROETHANE, TRICHLOROFLUOROMETHANE AND BROMOTRIFLUOROMETHANE.

Claim 3

A liquid dye penetrant composition as defined in claim 1, wherein said pyrrolidone is N-methyl-2-pyrrolidone.

Claim 4

A liquid dye penEtrant composition as defined in claim 1, wherein said dye is a fluorescent dye.

Claim 5

A liquid dye penetrant composition as defined in claim 2, wherein said dye is a fluorescent dye.

Claim 6

A dye penetrant composition as defined in claim 1, said volatile solvent being 1,1,1-trichloroethane.

Claim 7

A dye penetrant composition as defined in claim 4, said volatile solvent being 1,1,1-trichloroethane.

Claim 8

A dye penetrant composition as defined in claim 1, said dye penetrant composition additionally including a surfactant employed in an amount ranging from about 2 to about 25% by volume of said composition.

Claim 9

A dye penetrant composition as defined in claim 4, said dye penetrant composition additionally including a surfactant employed in an amount ranging from about 2 to about 25% by volume of said composition.

Claim 10

A dye penetrant composition as defined in claim 7, said surfactant being a water soluble or water insoluble surfactant containing ether-oxygen groups.

Claim 11

A dye penetrant composition as defined in claim 9, said surfactant selected from the group consisting of a nonyl phenyl polyethylene glycol ether and a trimethyl nonyl ether of polyethylene glycol.

Claim 12

A liquid dye penetrant composition for use in nondestructive testing for detecting cracks and flaws in a specimen surface, which consists essentially of an N-alkyl-2-pyrrolidone, said alkyl group containing from 1 to 4 carbon atoms, a dye which is soluble in said pyrrolidone, about 50 to about 97% by volume of said dye penetrant composition, of a volatile solvent selected from the group consisting of 1,1,1-trichloroethane, trichloroethylene, 1,1,2-trichloro-1,2,2-trifluoroethane, trichlorofluoromethane and bromotrifluoromethane, and including a surfactant employed in an amount ranging from about 2 to about 25% by volume of said composition, said surfactant being a water soluble or water insoluble surfactant containing ether-oxygen groups, selected from the group consisting of a nonyl phenyl polyethylene glycol ether and a trimethyl nonyl ether of polyethylene glycol, and including isobutyl heptyl ketone.

Claim 13

A liquid dye penetrant composition for use in nondestructive testing for detecting cracks and flaws in a specimen surface, which consists essentially of an N-alkyl-2-pyrrolidone, said alkyl group containing from 1 to 4 carbon atoms, a dye which is soluble in said pyrrolidone, about 50 to about 97% by volume of said dye penetrant composition, of a volatile solvent selected from the group consisting of 1,1,1-trichloroethane, trichloroethylene, 1,1,2-trichloro-1,2,2-trifluoroethane, trichlorofluoromethane and bromotrifluoromethane, and including a surfactant employed in an amount ranging from about 2 to about 25% by volume of said composition, said surfactant being a water soluble or water insoluble surfactant containing ether-oxygen groups, selected from the group consisting of a nonyl phenyl polyethylene glycol ether and a trimethyl nonyl ether of polyethylene glycol, and including isobutyl heptyl ketone.

Claim 14

A liquid dye penetrant composition for use in nondestructive testing for detecting cracks and flaws in a specimen surface, which consists essentially of N-methyl-2-pyrrolidone, a fluorescent dye which is soluble in said pyrrolidone, about 50 to about 97% by volume of said dye penetrant composition, of a volatile solvent selected from the group consisting of 1,1,1-trichloroethane, trichloroethylene, 1,1,2-trichloro-1,2,2-trifluoroethane, trichlorofluoromethane and bromotrifluoromethane, and including a surfactant employed in an amount ranging from about 2 to about 25% by volume of said composition, said surfactant selected from the group consisting of a nonyl phenyl polyethylene glycol ether and a trimethyl nonyl ether of polyethylene glycol, and also including isobutyl heptyl ketone.

Claim 15

A liquid dye penetrant composition for use in nondestructive testing for detecting cracks and flaws in a specimen surface, which consists essentially of N-methyl-2-pyrrolidone, a fluorescent dye which is soluble in said pyrrolidone, about 50 to about 97% by volume of said dye penetrant composition, of a volatile solvent selected from the group consisting of 1,1,1-trichloroethane, trichloroethylene, 1,1,2-trichloro-1,2,2-trifluoroethane, trichlorofluoromethane and bromotrifluoromethane, and including a surfactant employed in an amount ranging from about 2 to about 25% by volume of said composition, said surfactant selected from the group consisting of a nonyl phenyl polyethylene glycol ether and a trimethyl nonyl ether of polyethylene glycol, and also including isobutyl heptyl ketone.