BS 3379:2005 pdf download
BS 3379:2005 pdf download.Combustion modified flexible polyurethane cellular materials for loadbearing applications ——Specification.
Annex A (informative)
Schedule 1 to the Furniture and Furnishings (Fire) (Safety) Regulations 1988
NOTE Thm tones reproduces verbatim the Furniture and Furnishings (Filet (Safety) Regulations 105 Part 1. lgnitabihiy teat for
polyurethane foam in slab or c’iu.h ion form Ill.
I. The foam shall be tested in accordance with the method set out in KS 5852.2:1982 using cover fabric corresponding to the specification set out in paragraph 2 below.
2. The fabric shall be made of 100 tlame•reterdant polyester fibre, Its construction shall he woven to a plain weave. The yarn in the warp shall be of 1.6 decitex fibre, spun to a linear density of 37 tex. Z twist at 420 turns per metre. The fabric shall be woven to 20.5 yarn threads per centimetre in the warp. The yarn in the weft shall be of 3.3 decitex fibre spun to a linear density of 100 tex, Z twist at 554) turns per metre. The fabric shall be woven to between 12.6 and 13 threads per centimetre in the well. The fabric shall be scoured and heat set. Its mass shall be 220 g!m2 * 5 %.
3. The test rig as specified in Clause 6.1.1 of BS 5852-2 shall have expanded steel platforms of not less than (28 X 6) mm mesh size. The test rig is placed on a metal tray of sufficient dimensions to collect any debris falling from specimens being tested. The rig and debris tray shall be mounted on a weighing balance with a remote readout having a full-scale deflection of at least 0 kg to 20 kg to an accuracy of 2 g.
4. The foam under test, cut to the specified dimensions is placed on the test rig, covered with the fabric
specified in paragraph 2 above and tensioned with clips as set out in KS .3852.2:1982. An ignition source S crib is placed in position. The mass of the complete assembly is determined (“initial mass”). The test shall be carried nut in accordance with KS 5852.2:1982, In particular flaming or smouldering failure shall be determined against the criteria of Clause 4 of BS 5852-2:1982. After flaming and smouldering has ceased. any debris which has become detached from the specimen shall he removed. The remaining mass of the assembly (“final mass”) is then recorded.
5. If failure against the criteria of Clause 4 of KS 5852.2:1982 has xcurn’d. but only by way of the damage exceeding the limits defined in Clauses 4.1 (e). 4,1 (1) and 4.2(0. and provided that the resultant mass loss (initial mass less final mass) is less than 60 g, the roam passes the ignitability teSt,
Annex B (informative)
Typical applications for each class of material
Table B.I gives recommendations covering typical applications for the live classes of material, The class listed is the lowest recommended for that application.
Material classes X, V. S. A and L of flexible polyurethane cellular matorial Lire based on the results of the specified Constant load pounding test and the resulting performance ranking of a range of materials would be the same for any individual application. The different severity of various applications has been taken into account in framing these recommendations.
10 Physical and chemical requirements
10.1 Hardness loss
When tested in accordance with the method described in PiS EN ISO 3385, the indentation hardness loss of the material shall be not greater than the maximum shown in Figure 1 and Figure 2 for (he class and indentation hardness index of the material supplied.
10.2 Other properties
The properties of the material shall bc as given in Table 6, Table 7 and Table 8 as appropriate.
The standard test specimens used for the tests listed in Table 7 shall not include the surface skin, the adjacent layer of denser material or any portion where there is an obvious defect (see Note). A minimum of 5 mm shall be removed,
In all cases, the surface condition of the specimens shall be stated in the teat report.
NOTE It ii, permioo,blr to teal epectmeasof moulded matenals with akin tithe thwkiwaa of the moulding ii. inaumcient to yield apeciinens appropriate ajar titter rrmiwrl at mm af iudiwr aiatceaai
10.3 Reconstituted materials
NOTE I Keounatituted material (typa CM-RK, tweau..’ of its good fatigue properties ooinhino.d with JIoureF compression aet isnail.’ atrongth and elongation at break propertisa iti specified separately in Table 8.
The indentation hardness of CM-RE materials shall conform to Figure 1 and Figure 2 for class V materials.
NOTE 2 Type CM-RE material is pencrullv nard as thin, firm padding, or to pnn’ide rciniorccment far the other materials.
Reconstituted foam shall conform to the cleanliness requirements specified by the purchaser [seee Clause 3 item e)].
