BS 6853/BS 6853 Annex B: toxicity test

1. 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

2. Standard Brief -- 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 is utilized for 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 is utilized for 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 monoxide (CO) 
    Carbon Dioxide (CO2) 
    Hydrogen Bromide (HBr) 
    Hydrogen Chloride (HCl) 
    Hydrogen Cyanide (HCN) 
    Hydrogen Fluoride (HF)  
    Nitrous Oxides (NOx) 
    Sulphur Dioxide (SO2) 

Calculated “R” value

3. 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

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