ITC: Indention/Load/Deflection Machine
Maintaining firmness is a vital and difficult feature to achieve.
We know this because the test center works towards it every day. As a manufacturer of spring systems, we have developed our own world-class rigorous testing procedures and a unique testing machine to ensure that our products meet the most stringent standards: The Indention/Load/Deflection (ILD) Machine.
Essentially a tensile/compression test machine, the ILD evaluates the firmness of innersprings, box springs, upholstered mattresses and bedding sets by taking measurements of typical indention areas. We measure such areas as the shoulder zone, geometric center, and calf zone. 24 hours after the physical test, measurements are taken again to calculate the percentage of recovery. There is no established pass/fail criteria for this procedure but the historical guidelines are referenced to put your test in perspective.