NBN ISO 16840-13:2021

This document specifies apparatus, test methods, and disclosure requirements for determination of
lateral stability properties of wheelchair seat cushions by measuring the response from the cushion to
a shift in the centre of mass of the load on the cushion. It provides a method of determining changes in
a particular physical and mechanical property of the cushion. It does not provide information specific
to cushion performance for a particular individual user. It does not provide information related to
anterior-posterior stability, nor to stability contributions from cushion edges.
NOTE 1 Test conditions simulate a symmetric anatomy.
NOTE 2 Loads are intended to represent those seen under the pelvis of a 40th to 60th percentile wheelchair
user.
This document is applicable to cushions used in situations other than a wheelchair.