BS 4875-1:2007

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Strength and stability of furniture – Requirements for the strength and durability of the structure of domestic seating

Published By	Publication Date	Number of Pages
BSI	2007	16

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3	Contents 1 Scope 1 2 Normative references 1 3 Principle of the performance tests 1 4 Requirements 2 5 Tests 3 6 Test report 5 Annexes Annex A (informative) Test levels in relation to application 6 Annex B (normative) Flexibility assessment 6 Annex C (normative) Drop test for single-seat units 8 Bibliography 10 List of figures Figure B.1 – Back static load test with flexibility assessment 7 Figure C.1 – Drop test 8 Figure C.2 – Drop test for stacking chairs – Drop height relative to mass of stack 9 List of tables Table 1 – Purpose of tests 2 Table 2 – Tests 4 Table A.1 – Relationship of test levels to use of furniture 6
4	Foreword
5	1 Scope 2 Normative references 3 Principle of the performance tests 3.1 General a) static strength and initial damage; b) fatigue strength and damage propagation; c) ability to withstand acceptable misuse; and d) demonstration of residual strength.
6	Table 1 Purpose of tests 3.2 Static tests 3.3 Fatigue tests 3.4 Impact tests 4 Requirements a) any fracture of any member, joint or component, including seat suspensions and castors; b) any fracture or cracking through the full thickness of any part of a structural shell; c) any loosening, shown to be permanent by hand pressure applied to suitable members, of joints intended to be rigid; d) any loosening, relative to the shell surface, of the underframe or base inserts moulded into a structural shell, shown to be permanent by means of hand pressure applied to the underframe or base; e) any free movement in the back, arms, legs or other components of the article greater than that noted in the initial inspection (see 5.3); f) any deformation or cracks that will adversely affect the appearance or strength of any part of the sample;
7	g) any impairment of the operation of any mechanical part; h) the development of any clearly audible noise as a result of testing. 5 Tests 5.1 Samples 5.2 Moisture content of timber components 5.3 Inspection before testing 5.4 Procedure 5.5 Inspection after testing
8	Table 2 Tests
9	6 Test report a) the number and date of this British Standard, i.e. BS 4875-1:2007; b) details of the article tested, e.g. specification and photographs; c) the test level at which the article has been tested; d) details of any defects observed before the tests; e) details of any defects and damage observed after the tests; f) if appropriate: 2) details of any damage which does not impair the function of the article; g) for all-foam chairs, the back deflection in millimetres; h) the test result; i) details of any deviation from the test procedures; j) for articles which have adjustable components, the tightness and positioning of the adjustment used during testing.
10	Annex A (informative) Test levels in relation to application Table A.1 Relationship of test levels to use of furniture Annex B (normative) Flexibility assessment
11	Figure B.1 Back static load test with flexibility assessment
12	Annex C (normative) Drop test for single-seat units Figure C.1 Drop test
13	Figure C.2 Drop test for stacking chairs – Drop height relative to mass of stack
14	Bibliography

Additional information

Status	Withdrawn
Title	Strength and stability of furniture – Requirements for the strength and durability of the structure of domestic seating
Replaces	BS 4875-1:2001
Publisher	BSI
Committee	FW/0
Pages	16
Publication Date	2007-10-31
Withdrawn Date	2010-05-31
Replaced By	BS EN 12520:2010
ISBN	978 0 580 59216 4
Standard Number	BS 4875-1:2007
Descriptors	Flexibility, Performance testing, Furniture, Seating, Durability, Drop tests, Domestic, Strength of materials, Mechanical testing, Performance, Stability, Chairs
ICS Codes	97.140 - Furniture

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BS 4875-1:2007

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