UL 2518:2016 pdf free download – STANDARD FOR SAFETY Air Dispersion Systems.
6.6 All materials shall have a flame-spread index of not over 25 without evidence of continued
progressive combustion and a smoke-developed index of not over 50.
7 Mold Growth and Humidity Test
7.1 Materials for air dispersion system products, including any nozzles, tapes, fabrics, cements, or other materials shall be resistant to the effects of high humidity under standard atmospheric temperature conditions. The mold shall not spread beyond the inoculated area, and no significant growth of mold is to be observed. Materials shall not become deformed or delaminated; tapes, casings, and lining shall remain securely in place; and joints shall not open or show evidence of separation.
7.2 Three samples representing typical wall areas of the assembled air dispersion system materials are to be prepared. Each sample is to be 4 by 4 inches (102 by 102 mm) square and is to include any joining materials.
7.3 Mold mycelia and spores using Chaetomium Globosium are to be applied to the samples. The samples are to be placed in a closed vessel in which an atmosphere saturated with water vapor is maintained at room temperature and under dark conditions. The samples are to remain in this atmosphere until the extent of growth has been demonstrated or until the mold and spores have disintegrated, and not less than 60 days.
7.4 The samples then are to be examined visually for extent of mold growth and for indications of deterioration in wall structure, exterior casing, inner lining, tapes, and fabrics.
8 Temperature Test
8.1 General
8.1.1 Materials for air dispersion system products, including any nozzles, tapes, fabrics, cements, or other materials shall be resistant to the effects of the temperatures to which they are exposed in the following tests.
8.2 Low temperature
8.2.1 Material shall not become deformed or show delamination; tapes, casings, and lining shall remain securely in place; and joints shall not open or show evidence of separation when a sample is subjected to the test described in 8.2.2 — 8.2.4.
8.2.2 Three samples representing typical wall areas of the assembled product are to be prepared. Each sample is to be 8 by 8 inches (203 by 203 mm) square.
8.2.3 The samples are to be placed in a closed vessel in which an atmosphere saturated with water vapor is maintained at room temperature for a period of 48 hours. The samples then are to be removed and immediately placed in a refrigerated compartment and maintained at a temperature of minus 17.8°C (0°F) for a period of 24 hours.
8.2.4 The samples shall then be removed from the refrigerated compartment and allowed to be conditioned at 23 ±2°C (73 ±4°F) and 50 ±5 percent relative humidity for at least 24 hours. The samples then are to be examined visually for indications of deterioration in wall structure, nozzles, exterior casing or interior linings, tapes, fabrics, and cements.
8.3 High temperature
8.3.1 To comply with the requirements of 8.1.1, the exterior and interior surfaces of samples of air dispersion system sections are to be simultaneously exposed to air maintained at not less than 51 .7°C (125°F) on the exterior and not less than 129.4°C (265°F) on the interior. Any arrangement using samples of air dispersion system sections shall be employed. The test arrangement is to provide means for maintaining air at the specified test temperatures in moving contact with the two surfaces of the test samples. As a result of the test described in 8.3.2 — 8.3.4, structural material shall not become deformed or show delamination; tapes, casings, and lining shall remain securely in place; and joints shall not open or show evidence of separation.