Significance and Use

Defacement of paint and coating films by algal growth is a common phenomenon under certain conditions. It is generally known that differences in the environment, lighting, temperature, substrate, 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 (see Note 1).

Familiarity with microbiological techniques is required. This test method should not be used by persons without at least basic microbiological training.

1. Scope

1.1 This test method covers an accelerated method for determining the relative resistance of a paint or coating film to algal growth.

Note 1It is hoped that a ranking of relative performance would be similar to that ranked from outdoor exposures. However, this test method should not be used as a replacement for exterior exposure since many other factors, only a few of which are listed will affect those results.

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 and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D822 Practice for Filtered Open-Flame Carbon-Arc Exposures of Paint and Related Coatings

D4141 Practice for Conducting Black Box and Solar Concentrating Exposures of Coatings

D4587 Practice for Fluorescent UV-Condensation Exposures of Paint and Related Coatings

D5031 Practice for Enclosed Carbon-Arc Exposure Tests of Paint and Related Coatings

D6695 Practice for Xenon-Arc Exposures of Paint and Related Coatings

Keywords

agar plate; algae; algal resistance; Algae; Algal resistance; Coatings (paint/related applications); Defacement; Paint testing; Resistance; Agar plate assay ;

ICS Code

ICS Number Code 87.040 (Paints and varnishes)

DOI: 10.1520/D5589-09

ASTM International is a member of CrossRef.

ASTM D5589