BS 5873-2:1991

Committees responsible
Foreword
Specification
1. Scope
2. Definitions
3. Force-application devices
4. Strength tests
5. Stability tests
6. Marking
Appendices
A. Co-ordination of tests with BS 4875: Part 1
B. Seat static load test (Test 1a)
C. Back static load test (Test 1b)
D. Seat fatigue load test (Test 2a)
E. Back fatigue load test (Test 2b)
F. Tipping forward on one front leg test (Test 3)
G. Seat impact test (Test 4)
H. Back impact test (Test 5)
J. Chair drop test (Test 6)
K. Seat shell impact and frame detachment tests (Test 7)
L. Ferrule test (Test 8)
M. Footrail test (Test 9)
N. Stability tests (Tests 10a and 10b)
Tables
1. Summary of strength tests
2. Equivalence to BS 4875: Part 1
3. Seat loads and overturning forces
Figures
1. Illustration of a linkage arrangement for
    constraining seat loading pad
2. Seat static load test (Test 1a)
3. Back static load test (Test 1b)
4. Seat fatigue load test (Test 2a)
5. Back fatigue load test (Test 2b)
6. Seat impact test (Test 4)
7. Back impact test (Test 5)
8. Chair drop test (Test 6)
9. Impact test to top corner of back (Test 7a)
10. Impact test to top of back (Test 7b)
11. Impact test to rear face of back (Test 7c)
12. Impact test to front corner of seat (Test 7d)
13. Forwards overbalancing and sideways overbalancing
    tests (Test 10a)
14. Rearwards overbalancing test (Test 10b)

For the six sizes of chair given in Part 1. Two strength ratings, normal and severe, are specified for the two largest sizes.