This part of ISO 7176 specifies requirements and test methods to assess the resistance to ignition by match flame equivalent of all postural support devices that are supplied to be part of a wheelchair. This standard does not apply to postural support devices intended primarily to protect tissue integrity (as defined in ISO 16840-X). This standard applies to postural support devices (e.g. a sling seat or a sling back) upon which a nonintegrated postural support device (e.g. a cushion) can be positioned. The standard only determines the resistance to ignition of the devices tested and not the ignitability of the complete wheelchair. This standard does not apply to the resistance to ignition of other parts of a wheelchair, e.g. wheels, framework, etc. This standard does not take into consideration changes in resistance to ignition as a result of washing or use. This standard allows for the separate testing of inferior/superior supports (e.g. arm supports) which are usually used in the horizontal plane from anterior/posterior/lateral/medial supports (e.g. thoracic harnesses, calf panels) which are usually used in the vertical plane. NOTE 1 – The requirements of this standard have been set at a basic minimum level and are less severe than mandatory requirements in some countries. Manufacturers are recommended to use materials with superior resistance to ignition where practical. NOTE 2 – Requirements for the control of risks from sources of fire created by electrical and electronic components are included in ISO 7176-14. NOTE 3 – Until such time as a flammability standard is available for testing other components or accessories of the wheelchair it is recommended that any structural components considered to be at risk are tested at least to the ignitability levels of this standard.