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

The two different methods are as follows:

BS 6853 Annex B.1: Mass based test method(NF X 70-31)，This method should be appkied to minor use materials(table 7 and

table 8),textiles(table 11) and cables (table 13 and table14).

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 minor use materials of mass 31g to 500g (BS6853 Table 7)requirement: R(max)≤1.0
Exterior minor use materials of mass 400g to 2000g (BS6853 Table 7)requirement: R(max)≤1.7
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