ANSI/BIFMA 5.1-1993 Back Strength Test
The purpose of this test is to evaluate the ability of the chair to withstand
stresses such as those caused by the user exerting pressure on the back
on the chair. To evaluate the ability of the chair to withstand repeated
tilting back, see the back
durability test.
This picture is reproduced by permission of BIFMA.
For more information on specifics of the standard, contact BIFMA directly.