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ASTM D 5590

Standard Test Method for Determining the Resistance of Paint Films and Related Coatings to Fungal Defacement by Accelerated Four-Week Agar Plate Assay.

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Given below is general information pertaining to the ASTM 5590 Test: 

 


Defacement of paint and coating films by fungal growth (mold, mildew) is a common phenomenon, and it is known that differences in the environment, lighting, temperature, humidity, substrate pH, and other factors in addition to the coating composition affect the susceptibility of a given painted surface. This test method attempts to provide a means to comparatively evaluate different coating formulations for their relative performance under a given set of conditions.

This method is used for accelerated study for determining the relative resistance of two or more paints or coating films to fungal growth.

In ASTM D5590 the painted samples are inoculated with fungal spores. Incubation is done at controlled high humidity. Negative, positive and reference controls are run in parallel. 

Six test pieces are required per test sample for individual and pooled fungal inoculum. The test can be performed for severe challenge by use of nutritive medium and lesser challenge by using a mineral salt agar. Either or both the tests can be run in parallel depending on sponsor requirement.

Turnaround Time:
 4-5 weeks 

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