Silicone rubber potted fire modules were found to be very susceptible to fungus growth. The first coating developed to inhibit fungus growth was also susceptible to fungi. Two fungicides, copper-8-quinolinolate and p-chloro-m-xylenol, were incorporated into the coating with and without added red pigment. The coatings containing 2 percent p-chloro-m-xylenol were in effective, whereas coatings containing 0.25 percent of solubilized copper-8-quinolinolate were effective in preventing fungus growth but showed same blooming of the fungicide on the coating. Polyurethane was evaluated as a material for possible future use in the design of firing modules. A concentration of 2 percent p-chloro-m-xylenol was ineffective in preventing .fungus growth on the polyurethane, while a concentration of 0.25 percent copper-8-quinolinolate prevented the development of fungus growth but evidenced some blooming of the fungicide.
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