BS 6853/BS 6853 Annex B: toxicity test

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 (NO_x)

       • 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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