ISO 16840-10: Rullstolssitsar – Del 10: Resistens mot antändning av
positioneringshjälpmedel – Krav och provningsmetod

Standarden används för att bedöma antändligheten hos kombinationer av material, såsom klädsel och stoppning som används i positioneringshjälpmedel för rullstolar, när de utsätts för en antändningständkälla i form av en värmetrådsspiral.

Denna metod utvärderar endast antändlighetsegenskaperna. För att utvärdera hur en rullstol bidrar till en utvecklad brand måste den provas i full skala med kraftigare antändningskällor.

Provningen äger rum i ett dragskåp med kalibrerat luftflöde. Kombinationer av klädsel och stoppningsmaterial som används i positioneringhjälpmedel provas. Hjälpmedlet provas antingen vertikalt eller horisontellt beroende på hur det sitter monterat på rullstolen. Beroende på storlek på hjälpmedlet så provas antingen slutprodukten eller materialkombinationen i dynan. Oavsett så används en provningsrigg i stål vid försöken. Värmetrådsspiralen appliceras centrerat och i 90 gradig vinkel mot ytan.

Värmetrådsspiralen appliceras i 60 sekunder. För ett godkänt resultat gäller att positioneringshjälpmedlet inte antänder med låga och att det heller inte sker en pyrande antändning som varar längre än 120 sekunder.

Efter provning levereras en provningsrapport på svenska eller engelska med resultaten.

Materialåtgång för en fullständig provning:

• 2 stycken: Färdiga positioneringshjälpmedel alt.
• 2 av vardera Ingående material i dynan med mått 150 mm x 450 mm (vertikal dyna) och 150 mm x 300 mm (horisontell dyna)

Testing according to "UN Reccomendations on the transport of dangerous goods, Manual of Tests and Criteria, section 33.4.6 Test N.4: Test method for self-heating substances" evaluates a materials tendency to self-heat. The data is used for determination of safe transportation on road.

Dangerous goods are items or substances that can imply a risk for health, safety, property, or the environment. Some items, which may not be harmful by itself, may become a risk when combined with other substances.

Most regulations concerning dangerous goods, such as national regulations, the IMDG Code, IATA etc. are based on the UN Recommendations on the Transport of Dangerous Goods Model Regulations. The guidance document is developed by the United Nations to uniform national and international regulations. 

Dangerous goods are divided into nine different classes, grouped by their physical and chemical properties. Through testing a packaging group is assigned, in accordance with the degree of danger they present.

^{CLASS       SUBSTANCE}
1.          Explosive substances and articles
2.          Gases
3.          Flammable liquids
4.1        Flammable solids
4.2        Substances liable to spontaneous combustion
4.3        Substances which, in contact with water, emit flammable gases
5.1        Oxidizing substances
5.2        Organic peroxides
6.1        Toxic substances 
6.2        Infectious substances
7.          Radioactive materials
8.          Corrosive substances
9.          Miscellaneous dangerous substances and articles

Testing is performed according to UN manual of Tests and Criteria - Sektion 33.4.6 - Test N.4:Test method for self-heating substances and the the generated data can be used to classify dangerous goods and to use as a basis for risk analysis and research.

When testing according to Test N.4, the material may be classified as "Not a self-heating substance", "Self-heating substance - Packing group II/Cat. 1" or "Self-heating substance - Packing group III/Cat. 2". In some cases, the material may be classified as "Not a self-heating substance" if it is transported in smaller quantities, even though the test indicates self-heating.

In Test N.4, the material to be examined is placed inside a wire mesh basket, which is located inside an oven at a fixed elevated temperature. The temperature is then measured in the oven and at the centre of the sample over time.

An initial test is carried out in a metal wire basket with sides of 100 mm (1 dm²) and with an oven temperature of 140°C. This test shows whether the material is self-heating or not. If no self-heating occurs, the test is concluded and the material is reported as "Not a self-heating substance." If self-heating occures, an additional 1-3 tests are needed to determine the final packing group for the material. the occurrence of self-heating (temperature increase in the centre of the material > 60 °C above oven temperature) is examined at a specified oven temperature and test volume.

The definition of self-heating in Test No. 4 is that the temperature increase at the center of the material is 60°C or more above the oven temperature within 24 hours at a given oven temperature and test volume.

The result is summarized by RISE in a written report. The report is delivered in English.

Leadtime is communicated separately upon quotation.

Amount of material and sampling

Testing is performed on solid substances such as powders and granules. The amount of material required varies depending on the number of tests that need to be conducted. Each test requires 1 liter of the material. At least 2 liters of the material should be sent for testing.

The material should be sent in sealed containers.

UN Reccomendations on the transport of dangerous goods, Manual of Tests and Criteria, section 33.4.6 Test N.4: Test method for self-heating substances