FUNGUS-INHIBITIVE COATINGS IN A JUNGLE ENVIRONMENT
NAVAL RESEARCH LAB WASHINGTON DC
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The ability of ten candidate fungicides, singly and in combination, to suppress fungal growth on a variety of organic coatings under natural, tropical conditions was investigated. After 1 year of exposure, substantial protection for the susceptible coatings was afforded by copper-8-quinolinate and binary mixtures of p-toluenesulfonamide with copper-8-quinolinate and phenylmercuric phthalate in fairly low concentration. At a higher concentration, p-toluenesulfonamide provided good protection for the susceptible coatings, while its N-ethyl derivative was less effective and its N-cyclohexyl derivative was almost inert. At an intermediate concentration, 2,3-dichloro-1, 4-naphthoquinone and p-chlorophenoxyacetic acid provided effective protection for the susceptible coatings. None of the eight binary mixtures tested showed any evidence of synergism. The results confirm those obtained from earlier exposure programs, which showed that p-toluenesulfonamide is effective at higher concentrations in providing protection against fungal infestations. It was observed, however, that at very low levels this material may act as a growth promoter.
- Coatings, Colorants and Finishes