Testing
Load Deflection and Hysteresis
This test records the stepwise force during compression and release of materials of construction.
![Load Deflection and Hysteresis](https://www.ec-service.net/wp-content/uploads/2023/01/loadDeflection.jpg)
Why this test is needed
How a support surface deforms under load, and how it pushes back on the body of the occupant identifies “tissue protection.”
How this test is performed
A disk shaped indenter is applied in a stepwise loading and unloading to the support surface.