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Significance and Use
4.1 Defacement of paint and coating films by fungal growth (mold, mildew) is a common phenomenon, and defacement by algal growth can also occur under certain conditions. It is generally 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. It does not imply that a coating that resists growth under these conditions will necessarily resist growth in the actual application. The method is not intended to simulate or replace indoor or outdoor exposure of paint films or related coatings.
Note 1: It is hoped that a ranking of relative performance would be similar to that ranked from outdoor exposures. Paint designated for service in exterior conditions should be pre-conditioned by laboratory accelerated weathering prior to exposure to fungi. All pre-conditioning must be detailed in the final report. This test method however, should not be used as a replacement for exterior exposure (that is, Practice ) since many other factors, only a few of which are listed will affect those results.
4.2 Familiarity with microbiological techniques is required. This test method should not be used by persons without at least basic microbiological training.
1.1 This test method covers an accelerated method for determining the relative resistance of two or more paints or coating films to fungal growth.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D1005 Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers
D3273 Test Method for Resistance to Growth of Mold on the Surface of Interior Coatings in an Environmental Chamber
D3456 Practice for Determining by Exterior Exposure Tests the Susceptibility of Paint Films to Microbiological Attack
D4587 Practice for Fluorescent UV-Condensation Exposures of Paint and Related Coatings
D4708 Practice for Preparation of Uniform Free Films of Organic Coatings
D6132 Test Method for Nondestructive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic Coating Thickness Gage
D6695 Practice for Xenon-Arc Exposures of Paint and Related Coatings
G21 Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi
ICS Number Code 87.040 (Paints and varnishes)
UNSPSC Code 46181533(Protective coats)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM D5590-17, Standard Test Method for Determining the Resistance of Paint Films and Related Coatings to Fungal Defacement by Accelerated Four-Week Agar Plate Assay, ASTM International, West Conshohocken, PA, 2017, www.astm.orgBack to Top