Accession Number : ADD005925

Title :   Void, Flaw, and Crack Indicator for Epoxy Bonds.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C

Personal Author(s) : Nieberlein,Vernon A

Report Date : 26 Sep 1978

Pagination or Media Count : 3

Abstract : A method for locating imperfections including voids, bubbles, cracks, and flaws 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. (Author)

Descriptors :   *Patents, *Epoxy resins, *Defects(Materials), *Chemical indicators, Solutions(Mixtures), Adhesive bonding, Curing, Cracks, Bubbles, Voids

Subject Categories : Physical Chemistry
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE