Fungus resistance test methods

Fungus-resistance tests are used to determine the reaction of adhesives to several species of fungi under high humidity and a warm environment in the presence of inorganic salts. Testing for fungus resistance is more appropriate for exposed adhesives as in printed-wiring assemblies than for hermetically sealed devices or modules. One test method specified as Method 4.5.14 in IPC-SM-817 references Method 2.6.1 of IPC-TM-650, Test Methods Manual... 

JIS Z 2911 1992 Methods of test for fungus resistance. Japan Fouling tests... 

This accelerated laboratory test is somewhat similar to the test to determine resistance of plastic material to fungi. The bacterial cell suspension in place of the fungus spore suspension is used to study the effect. The test is conducted in a similar manner by spraying the bacterial cell suspension onto the specimen placed in a petri dish covered with nutrient salts agar. The incubation is carried out for a minimum of 21 days under specified conditions in the incubator. A variation of the standard method is sandwiching the sample between two equal lots of nutrient salts agar and then spraying the bacterial cell suspension on it. This variation provides a more extensive contact between the test bacteria and the specimens. 

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