ISO 16840-11:2022

INTERNATIONAL ISO
STANDARD 16840-11
First edition
2022-05
Wheelchair seating —
Part 11:
Determination of dissipation
characteristics of sensible
perspiration into seat cushions
Reference number
© ISO 2022
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 Principle . 2
6 Test apparatus .2
6.1 Perspiration rigid cushion loading indenter . 2
6.1.1 Shape of PRCLI . 2
6.1.2 Temperature control on the PRCLI . 2
6.1.3 Loading mechanism. 3
6.1.4 Discharge mechanism . 3
6.1.5 Sensing system . 4
6.2 Electrical impedance measurement system . 4
6.3 Test environment . 4
7 Preparation for testing . 5
8 Test method . 5
9 Test report . 5
Bibliography . 8
iii
Foreword
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 173, Assistive products, Subcommittee SC
1, Wheelchairs.
This first edition of ISO 16840-11 cancels and replaces ISO/TS 16840-11:2014, which has been
technically revised.
The main changes are as follows:
— addition of details around the test apparatus, preparation and method to make the test easier to
process.
A list of all parts in the ISO 16840 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
Dissipating perspiration and moisture on seat cushions is important to prevent pressure injuries and
tissue maceration, and for comfortable sitting. Perspiration can occur as water vapour, and/or as
moisture – sensible moisture has not undergone a phase change to vapour, whereas insensible moisture
has undergone the phase change and is in the vapour phase.
The results of the testing methods in this document have not been clinically validated to support any
medical claims of prevention of pressure injuries or prevention of tissue maceration.
v
INTERNATIONAL STANDARD ISO 16840-11:2022(E)
Wheelchair seating —
Part 11:
Determination of dissipation characteristics of sensible
perspiration into seat cushions
1 Scope
This document specifies a method for determining the dissipation characteristics of simulated sensible
perspiration exposure on seat cushions of a wheelchair under test conditions that simulate body loading
on support surfaces with flat and contoured profiles. The test method is applicable to a wide variety of
seat cushion materials and constructions that are used across the world.
The test method is intended to determine how the cushion handles a liquid load. It is not intended to
determine how the cushion responds to a continuous release of liquid or vapour.
This document also specifies apparatus to measure dissipation characteristics (of perspiration) of seat
cushions and the approach to be employed in measuring these characteristics.
This document is applicable to seat cushions for wheelchairs that include a cushion cover.
NOTE The significance of the dissipation characteristics of the seat cushion can be greatly affected by the
clothing worn, for example a moisture wicking cover mig
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