BS ISO 16840-2:2018

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Apparatus
6 Preparation of test cushion
7 Sequence of testing
8 Frictional properties
9 Impact damping under normal loading conditions
10 Recovery
11 Loaded contour depth and overload deflection
12 Water spillage
13 Biocompatibility
14 Hysteresis test
15 Test report
16 Disclosure requirement
Annex A (normative) - Tapered uniform
        geometry RCLI
Annex B (informative) - Typical ranges for ISO
        16840 2 tests and indicative cushion
        implications
Annex C (informative) - Horizontal stiffness and
        sliding resistance
Annex D (informative) - RCLIs for testing of
        alternatively sized cushions
Bibliography

Specifies apparatus, test methods and disclosure requirements for wheelchair seat cushions intended to maintain tissue integrity and prevent tissue trauma.

This document specifies apparatus, test methods and disclosure requirements for wheelchair seat cushions intended to maintain tissue integrity and prevent tissue trauma. Test conditions simulate a symmetric anatomy and posture and do not represent cushion performance for specific individual users. Loads are intended to represent those seen under the pelvis of a 50th percentile wheelchair user and are not intended to assess the weight capacity of the cushion or to characterize the cushion under bariatric loads. It is possible that not all test methods apply to existing and future cushion technologies. It does not include test methods or requirements for determining the fire resistance of cushions.

This document can also be applicable to tissue integrity management devices used as other support systems, as well as to cushions used in situations other than a wheelchair.