EST FLAMMABILITY OF UPHOLSTERED FURNITURE
WITH THE METHODS ACCORDING TO BS 5852
Principle of the test. The flammability test of upholstered furniture consists in the interaction of small ignition sources on samples corresponding to the actual upholstered system and observation of the effects of this reaction to fire. On the metal frame, the arrangement of upholstery materials, i.e. the covering, separating and filling materials, etc., shall be subjected to smouldering and burning flame ignition sources:
Types used ignition sources depends on the required level of risk:
For low hazard – resistant to ignition with source
For medium hazard – resistant to ignition with source
flame equivalent and
crib source no. 5 of BS 5852
For high hazard – resistant to ignition with source
flame equivalent and
crib source no. 7 of BS 5852
Stand for testing the ignitability of upholstered furniture according to BS 5852
Observe the progress of combustion, and record any evidence of progressive smouldering or flaming in the interior and/or cover. At the end of each trial, a upholstered furniture is examined to determine possible internal progressive oxygen.
Cover. The flammability tests of the upholstered set should be performed on covering material samples with dimensions of 1100+10x650+10mm.
Where a separating cloth is used, it must be cut identically and with the same orientation as the cover fabric to fit the test rack under cover.
Upholstery Filling. For each test, two test systems with the following dimensions are needed:
a) one piece 450+/-4mm x 300+/-5 mm x 75+/-2 mm thick,
b) one Piece 450+/-5mm x 450+/-5 mm x 75+/-2 mm thick.
Some cushioning assemblies may consist of several layers that may be typically felt, wadding or different foams. In these cases the test pieces shall reproduce the upper 75 mm of the cushioning assembly. Where the filling is less than 75mm thick, the test piece shall be built up to the required thickness by adding to the underside a further layer of the bottom material. Loose fill (e.g. foam pieces, feathers) can be evaluated by this method. To test the resistance to the smoldering of a cigarette, just prepare one set. The test for flame resistance requires the preparation of at least two samples.
Evaluation of results. If, within 1h of the application, the ignition sources no progressive smouldering ignition or flaming ignition of any element of the upholstered system is observed, the result of the test of this system shall be considered positive.
Applying research methods: UK requirements (requirements of the norm BS 7176).