BS6853:1999: Code of practice for fire precautions in the design and construction of passenger carrying trains.
BS6853 Annex B: Determination of weighted summation of toxic fume, R

BS 6853 Annex B.2: Area based test method（prEN2824，prEN2825，prEN2825). An area based method should be used used for sufaces(Table 1,Table 2,Table 3,Table 4,Table 5,Table 6) seat tirm and seat shell(Table 9,Table 10) and mattresses(Table 12).

BS 6853 Annex B.3 Gases to be analysed, analysed:CO,CO2,HBr,HCl,HCN,HF,NOx,SO2
BS 6853 Annex B.4 Calculation of R

What is toxicity testing?
Measuring the fumes produced from a material exposed to controlled fire conditions gives an indication of the fumes which may be produced in a real fire situation. This enables us to choose materials with lower levels of risk to human life.

BS6853:1999 Standard requirement for Toxicity testing
Interior horizontal supine surfaces (BS6853 Table 1)requirement: R(max)≤5.0
Interior vertical surface for BS6853 (BS6853 Table 2) requirement: R(max)≤1.0
Interior horizontal prone surfaces for BS6853 (BS6853 Table 3) requirement: R(max)≤1.0

Exterior horizontal supine surfaces (BS6853 Table 4)requirement: R(max)≤8.5
Exterior vertical surface for BS6853 (BS6853 Table 5) requirement: R(max)≤1.7
Exterior horizontal prone surfaces for BS6853 (BS6853 Table 6) requirement: R(max)≤1.7
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