Young Blonde Girl Posing On The Chair

leg strength of 75 pounds (34 kg) applied one inch (25 mm) from the bottom of the leg
seat strength of 225 pounds (102 kg) dropped from six inches (150 mm) above the seat
seat cycle strength of 100,000 repetitions of 125 pounds (57 kg) dropped from 2 inches (50 mm) above the seat
The specification further defines heavier "proof" loads that chairs must withstand. Under these higher loads, the chair may be damaged, but it must not fail catastrophically.