Standard-- BS 6853/BS 6853 Annex B: toxicity test

BS 6853 Annex B: Determination of weighted summation of toxic fume, R

BS6853: 1999 Code of practice for fire precautions in the design and construction of passenger carrying trains
 

BS 6853/BS 6853 Annex B: toxicity test

There are two different test methods which can be utilized to determine the toxic fumes produced from materials to be placed on passenger carrying trains in the UK:

BS 6853 Annex B.1 apply to Minor Use Materials (Tables 7 and 8 of BS 6853: 1999), Textiles (Table 11 of BS6853: 1999) and Cables (Tables 13 and 14of BS 6853: 1999).

BS 6853 Annex B.2 apply to Surface Materials (Tables 1, 2, 3, 4, 5 and 6), Seat Trim Materials & Seat Shell Materials (Tables 9 & 10) and Mattresses (Table12).

The gases which are analysed are as follows:

       Carbon Dioxide (CO2)

       Carbon monoxide (CO)

       Hydrogen Bromide (HBr)

       Hydrogen Chloride (HCl)

       Hydrogen Cyanide (HCN)

       Hydrogen Fluoride (HF) 

       Nitrous Oxides (NOx)

       Sulphur Dioxide (SO2)

Calculated “R” value

BS 6853:1999 Standard requirement for Toxicity testing

Interior horizontal supine surfaces for BS 6853 requirement: R≤5.0

Interior vertical surfaces for BS 6853 requirement: R≤1.0

Interior horizontal prone surfaces BS 6853 requirement: R≤1

Exterior horizontal supine surfaces for BS 6853 requirement: R≤8.5

Exterior vertical surfaces for BS 6853 requirement: R≤1.7

Exterior horizontal prone surfaces BS 6853 requirement: R≤1.0

Interior minor use materials of mass 100g to 500g BS 6853 requirement: R≤1.0

Exterior minor use materials of mass 400g to 2000g BS 6853 requirement: R≤1.7