NF X 70-100 Toxic gas analysis test – Standard
NF X70-100: Fire behavior tests – Analysis of pyrolysis and combustion gases -Pipe still method
NF X 70-100 Toxic gas analysis test-General
NF X70-100 is a mass based toxic gas analysis test method. The test standard allows the measurement of many different toxic gases. For the purpose of F rating classification in accordance with NF F 16-101, the gases which are analyzed are as follows:
Carbon monoxide (CO)
Carbon Dioxide (CO2)
Hydrogen Bromide (HBr)
Hydrogen Chloride (HCl)
Hydrogen Cyanide (HCN)
Hydrogen Fluoride (HF)
Sulphur Dioxide (SO2)
Nitrous Oxyde (NOx)
NF X 70-100 Toxic gas analysis test-Principle
The test is conducted within a tube furnace where the temperature is generally 600°C (in some instances this can be 400°C or 800°C). Toxic fume emission testing is then carried out in triplicate and the average of these results is used to calculate the “CIT” Value. The collection / measurement of toxic fumes takes place throughout the 20 minutes test duration. The toxic fume emission is expressed in milligrams per gram of material, on the assumption that the mass of the test piece is 1g.
NF X 70-100 Toxic gas analysis test –Reference Standard
NF X10-702: Fire test methods – Smoke emission – Test of measurement of specific optical density of smoke by the combustion or the pyrolysis of solid materials
BSS 7239 Test method for toxic gas generation by materials on combustion