UL-1618:2015 pdf free download – STANDARD FOR SAFETY Wall Protectors, Floor Protectors, and Hearth Extensions.
9.6 The floor under the heat producing source is to extend at least 4 feet (1.2 m) in front of the heat producing source. The floor and back wall are to join the side wall. The floor and walls are to extend at least 4 feet beyond the projection of the heat producing source.
9.7 The side and back walls are each to consist of one thickness of 3/4-inch (19-mm) thick plywood.
9.8 The test structure is to include a 3/4 inch (19 mm) thick plywood ceiling located 8 feet (2.4 m) above the floor and extending not less than 4 feet (1 .2 m) beyond the projection of the heat producing source.
9.9 All wall, floor, and ceiling surfaces of the test structure are to be painted flat black.
10 Accelerated Aging Test
10.1 Noncombustible insulating material used in a product shall demonstrate neither thermal decomposition nor degradation of thermal characteristics as a result of the accelerated aging procedures described in 10.2 — 10.5.
10.2 Two 12 by 12 inch (305 by 305 mm) samples of the product’s noncombustible insulating material are to be used for this test. (See 6.3).
10.3 One of the samples is to be placed in an oven at 300°F (149°C) for 30 days.
10.4 Following the accelerated aging period, the aged and unaged samples of the insulating material are
to be dried for 24 hours at 140°F (60°C) and then conditioned at a temperature of 73 ±5°F (23 ±3°C) and
a relative humidity of 50 ±5 percent for at least 8 hours.
10.5 Following the conditioning specified in 1 .4, the thermal resistance of the aged sample shall be measured with either ASTM C177 (Guarded Hot Plate) or ASTM C518 (Heat Flow Meter). The mean temperature for the measurements should be 110 ±10°F. The measurements shall show less than 10 percent degradation in the thermal resistance of the aged sample when compared to the unaged sample.
11 Thermal Resistivity Test
11 .1 For Type 1 Ember Protectors as defined in 5.2(a), no thermal resistivity test is required. A statement that the R-Value = 0 for this product shall be included on the permanent label, in the installation manual and on removable labeling per requirements of Section 16, Markings.
11.2 Type 2 Thermal Floor Protectors as defined in 5.2(b), shall have a minimum R-value of R = 1.0 measured on 12 inch x 12 inch section of the floor protector — constructed and positioned to exhibit the worst-case test situation for thermal conduction with the floor protector as normally installed. The R-value shall be measured with either ASTM C177 (Guarded Hot Plate) or ASTM C518 (Heat Flow Meter). The mean temperature for the measurements should be 110 ±10°F. The actual R-Value as measured in this test shall be included on the permanent label, in the installation manual, and on removable labeling per requirements of Section 16, Markings.
11 .3 If the floor protector being tested per 11.2 contains spacers to create an air space under the floor protector, a box may need to be constructed of mineral fiber board to facilitate thermal resistivity testing. The bottom and the walls of box are to be constructed of 0.5 inch mineral fiber board. The seams of the box and the seams between the box and the unit under test should be sealed with silicone. The tops of the sides of the box should be level with the top surface of the unit under test.