UL-2239:2015 pdf free download – STANDARD FOR SAFETY Hardware for the Support of Conduit, Tubing, and Cable.
6.3.8 Each sample shall be subjected to the test at three or more points — excluding cut, stenciled, and threaded surfaces — on the inside surface and at an equal number of points on the outside surface, at places where the metallic coating is the thinnest.
6.3.9 The thickness of the coating being tested shall be calculated by determining the thickness factor corresponding to the temperature at which the test was conducted from Table 4, multiplying by 0.0003 mm (0.0000 1 in), and then multiplying by the time in seconds required to expose the base metal as determined in accordance with Clause 6.3.7.
6.4 Alternative corrosion protection systems tests
6.4.1 General
6.4.1 .1 A coating, other than zinc plating, that is not intended for use in wet locations shall comply with Clause 6.4.3. Sample preparation and conditioning shall be in accordance with Clauses 6.4.1.3, 6.4.1.4, and 6.4.2.
6.4.1.2 A coating, other than zinc plating, that is intended for use in wet locations shall comply with Clauses 6.4.3 — 6.4.5. Sample preparation and conditioning shall be in accordance with Clauses 6.4.1.3, 6.4.1.4, and 6.4.2. The resistance to ultraviolet light and water exposure is only applicable for painted or polymeric coatings.
6.4.1.3 For a corrosion protection system intended for use in wet locations, a minimum of 50 samples of the finished product that is representative of an alternative corrosion protection system and has maximum significant surface area, or, where appropriate for the system under investigation, steel panels measuring 100 by 150 mm (4 by 6 in) of any thickness, shall be provided. A minimum of 30 samples shall be tested. For corrosion protection systems not intended for use in wet locations, a minimum of 20 samples shall be provided. A minimum of 12 samples shall be tested. The additional samples shall be used in case of damage to the original samples during preparation or handling.
6.4.1.4 The edges or unprotected surfaces of all panels or finished products shall be covered with moisture-resistant tape or compound. For painted coatings, half of the samples to be exposed shall be scribed in accordance with ASTM Dl 654. The samples shall be free of dirt or foreign matter. Samples shall be suitably cleaned. The cleaning method shall be optional depending on the nature of the surface and the contaminants. Care should be taken that samples are not re-contaminated after cleaning by excessive or careless handling. The coating thickness of each sample shall be measured prior to exposure to the test environments.
6.4.2 Air-oven conditioning exposure
6.4.2.1 Not less than six unscribed, and where appropriate, six scribed samples (see Clause 6.4.1.4) of each system shall be conditioned for 240 h in an air-circulating oven at 87 ±1 °C (189 ±2 °F). These samples shall be used for Clauses 6.4.3 and 6.4.4.
6.4.3 Resistance to salt-spray (fog) test
6.4.3.1 A minimum of six as-received and a minimum of six air-oven conditioned samples shall be exposed to the salt spray (fog) for a duration as specified in Table 5. Exposure shall be in accordance with ASTM Bi 17. Where applicable, three of the as-received and three of the air-oven conditioned samples shall be scribed as specified in Clause 6.4.1.4.
6.4.3.2 For a painted or polymeric coating, as a result of the exposure in Table 5, the unscribed samples shall not be greater than Rating No. 5 (11 — 20 percent area failure) as designated in Procedure B of ASTM Dl 654. For the scribed samples, the average creeping distance of corrosion products from the scribe shall not be greater than Rating No. 5 [3 — 5 mm (1/8 — 3/16 in)] as designated in Procedure A, Method 2 of ASTM D1654, with maximum isolated spot not exceeding 9.5 mm (3/8 in).