Void, flaw, and crack indicator for epoxy bonds

Details Void, flaw, and crack indicator for epoxy bonds Void, flaw, and crack indicator for epoxy bonds

1977-09-26

1978-09-26

Wolk, Morris O.

Chemistry: physical processes

Physical processes

Crystallization

73104, 427 8, 23230L, G01N 2116

Patent

active

041166345

ABSTRACT:
A method for locating imperfections including voids, bubbles, cracks, and aws in cured epoxy resin articles. These imperfections which are too small to be readily seen with the naked eye, or that are normally very inconspicuous become visible when an indicator solution is applied to the epoxy resin imperfection. The indicator solution is selected from a 0.1 percent alcoholic solution of bromcresol purple, bromthymol blue, thymol blue, meta-cresol purple, xylenol blue, aurin, methyl violet, lacmoid, and resazurin for locating imperfections in epoxy resins cured with an alkaline curing agent such as an amine. The indicator solution is selected from a 0.1 percent alcoholic solution of congo red, p-sulfo-o-methoxybenzene, and azodi-methyl-alpha-naphthylamine for locating imperfections in epoxy resins cured with an acidic curing agent.

REFERENCES:
patent: 2079925 (1937-05-01), Reichert
patent: 2884339 (1959-04-01), Dannenberg
patent: 3490873 (1970-01-01), Corl
patent: 3652224 (1972-03-01), Johnson et al.
patent: 3652225 (1972-03-01), Coffin, Jr. et al.

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