UL 181B:2017 pdf free download – STANDARD FOR SAFETY Closure Systems for Use With Flexible Air Ducts and Air Connectors.
11 Surface Burning Characteristics Test
11.1 A pressure sensitive tape of the maximum width recommended by the manufacturer shall be tested
in accordance with the Standard for Test for Surface Burning Characteristics of Building Materials, UL
723, and shall have:
a) A flame-spread rating of not over 25 without evidence of continued progressive combustion; and
b) A smoke-developed rating of not over 50 when applied to inorganic reinforced cement board.
11.2 One strip of the pressure sensitive tape is to be applied along the longitudinal center of each section of the inorganic reinforced cement board substrate in accordance with the recommended field application instructions. The inorganic reinforced cement board utilized as a test substrate shall have flame spread and smoke developed indices of 0. For the purpose of establishing these indicies, typically three tests are to be conducted.
12 Mold Growth and Humidity Test
12.1 Pressure-sensitive tape shall be resistant to the effects of high humidity under ordinary atmospheric temperature conditions.
12.2 Three samples of tape, each 4 inches (102 mm) long and in the as-received width, are to be tested
12.3 Mold mycelia and spores from Chaetomium Globosium are to be applied to both sides of the specimens. The specimens are to be placed in a closed vessel in which an atmosphere saturated with water vapor is maintained at room temperature under dark conditions. The specimens are to remain in this atmosphere until the maximum extent of growth has been demonstrated, or until the mold and spores have disintegrated, but not less than 60 days.
12.4 The specimens then are to be examined visually for extent of mold and for indications of deterioration of the tape specimens. The mold shall not have spread beyond the inoculated area, and no significant growth of mold shall be observed.
13 Temperature Test
13.1 The tape shall be resistant to the effects of the high temperature conditions to which it is exposed during this test.
13.2 Twelve specimens are to be made by applying a 2 by 2 inch strip of tape to three 4 by 4 inch (102 by 102 mm) samples of each of the following materials: aluminum foil, polyethylene, polyethylene terephthalate, and chlorinated polyethylene. Total of twelve samples are to be tested. The substrate samples with the tape sample applied shall be taped at the edges to 5 by 5 inch galvanized plates for stability.
13.3 Another 4 by 4 inch (102 by 102 mm) control sample of each of the substrate materials are to be cut and also taped at the edges to 5 by 5 inch galvanized plates for stability. Candidate pressure sensitive tape specimens shall not be applied to the control sample.
13.4 The test specimens and control samples are to be placed in an air circulating oven maintained at 212 +5°F (100 +3°C) for a period of 60 days.
13.5 The samples are then to be examined visually for indications of deterioration, brittleness, cracking, flaking, and blistering.
MARKING
14 General
14.1 The tape shall be marked every 6 inches (152 mm) or fraction thereof with all of the following
information:
a) The manufacturer’s or private labeler’s name or identifying symbol;
b) The distinctive type or model designation;
c) The manufacturing location, if the manufacturer produces pressure-sensitive tape at more
than one factory; and
d) The marking “181B-FX.”