NFPA 261-1998 Standard Method of Tests for Determining Resistance of Mock-Up Upholstered Furniture Material Assemblies to Ignition by Smoldering Cigarettes

NFPA 261-1998 Standard Method of Tests for Determining Resistance of Mock-Up Upholstered Furniture Material Assemblies to Ignition by Smoldering Cigarettes. 4-4 Tight Seat. If a furniture item is constructed with tight seats only, then the seat shall be duplicated for test in mock- up. Tight seat cushions shall be made 450 mm ± 50 mm × 550 mm ± 50 mm and with the same fabric and the same thickness used in production furniture. The cushion assem- bly shall be attached to the horizontal panel of the test appa- ratus [see Figure 2-1(c)] by extending the upholstery cover material around the panel edges and fastening the cover material to the underside of the wood panel. 4-5 Side and Back Panels. A mock-up of furniture sides and backs shall be constructed if, in the type of furniture to be represented by the mock-up, the sides and backs are located within 25 mm of a seat cushion. Mock-ups shall be made by upholstering one surface of the vertical test panel [see Figure 2-1(c)] with the same upholstery material and upholstery cover material used in production furniture. The upholstery cover material shall be stretched over the upholstery material and fastened to the back side of the framework. All edges of the panels shall be covered with upholstery cover material. If the side panel and back panel constructions of the furniture item are the same, only one vertical panel shall be required to be assembled and tested. 5-1 Mock-up Test Sample. A mock-up test sample shall be assembled by attaching the side panel, back panel, or both, to the mock-up frame and by placing a seat cushion, either loose or tight seat construction, against the panels as shown in Fig- ure 1-3.2(b). The assembly shall be permitted to be placed on a table or platform in the test area and shall be under an exhaust hood or other suitable means for exhausting the products of combustion from testing. The decks for loose cushion items, tops of armrests, and tops of backs shall be tested separately. 5-2 Cigarette Locations. At least three cigarettes shall be burned on each surface location [see Figures 1-3.2(a) and (b)]. These locations shall include the crevice(s) where seat cush- ions and vertical panels meet; seat cushion surfaces, including welt and smooth, quilted, or tufted areas; top of upholstered armrest; and tops of upholstered back and deck. 5-3 Crevice Location. For...