Home>ASTM Standards>ASTM D5479-94(R2020) pdf free download

ASTM D5479-94(R2020) pdf free download

ASTM D5479-94(R2020) pdf free download.Standard Practice for Testing Biofouling Resistance of Marine Coatings Partially Immersed
1. Scope
1.1 This practice covers a procedure to test a biofouling resistant coating systems or antifouling systems, or both, when subjected to in situ partial immersion exposure. This enhances settlement ofcertain marine fouling organisms and increase the rate of possible physical deterioration. 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Terminology
3.1 Definitions: 3.1.1 antifouling coatings, n—polymeric applied films en- gineered to prevent marine fouling settlement due to inclusion of antifouling compounds within its formulated matrix. 3.1.2 biofouling-resistant coatings, n—polymeric applied films, engineered to prevent secured or permanent attachment of marine fouling organisms due to certain surface character- istics. 3.1.3 film(s), n—each layer or coat of paint as applied to the substrate or on top of another applied coat. 3.1.4 system, n—cumulative total number of coating films, which includes application of a primary film(s) for the purpose of protecting the substrate from possible deterioration, or enhancing the adhesion of the biofouling resistant coating or antifouling coating to the primary film(s), or both. 3.2 Biofouling resistant coatings and antifouling coatings are interrelated; thus they are used in this practice interchange- ably.
4. Significance and Use
4.1 This test method is designed as a screening test to evaluate the performance of applied coating systems and other materials designed to resist biofouling settlement. 4.2 The degree and type of fouling will vary depending on the environment. Differences in geographic location of test sites, time of year when panels are exposed, and weather conditions from one year to the next, can affect results. Such variables are accounted taking a fouling census on a nontoxic surface. For the exposure to be valid, the nontoxic surface should show heavy fouling accretion.
5. Apparatus
5.1 Floating Raft—The test panels shall be mounted on a floating raft to maintain the correct position in the water.5.1.1 The floating raft shall be constructed with a minimal amount of decking to maximize sunlight exposure on the test panel’s surfaces. 5.2 Exposure Rack—Each rack will provide firm vertical installation of several (4 to 8) test panels that must be positioned in such a manner that the prevailing tidal currents will move parallel to the panels’ surfaces. 5.2.1 The method of rack installation must provide a means of easy but dependable height adjustment. The movement of the lower (immersed) end of each rack is limited to 20° from the vertical. 5.2.2 Test panel racks should be constructed of plastic materials, or insulators must be utilized to prevent test panels from metallic contact. 5.2.3 The distance between two racks (from panels’ surface) shall be a minimum of 30 cm (12 in.) to allow sufficient sunlight on the coating surface.
6. Materials
6.1 Test Panels—The substrate(s) for application of the experimental coating system shall be one or more of the materials that would simulate the end use of the biofouling resistant or antifouling coating system, or both. The most commonly used substrates are as follows: 6.1.1 Medium low-carbon steel plate, 6.1.2 Reinforced polyester with at least one molded face exposing a polyester gel coat, 6.1.3 Marine aluminum alloy No. 5086 or newer version, or 6.1.4 Other materials that are appropriate for marine expo- sure. 6.2 Panel—The panels shall be approximately 15 by 46 cm (6 wide by 18 in. long) with a minimum thickness of 3 mm ( 1 ⁄ 8 in.) for metal panels while fiberglass and wood panels shall have a minimum thickness of 5 to 13 mm ( 3 ⁄ 16 to 1 ⁄ 2 in.). Each panel shall have four holes, each 8 mm ( 5 ⁄ 16 in.) in diameter, drilled prior to coating application. Each of the holes shall be centered at approximately 19 mm ( 3 ⁄ 4 in.) from each corner. The holes will be utilized for the purpose of attaching the test panels to the racks.

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