International Organization for Standardization

Controlled equivalence ratio method for the determination of hazardous components of fire effluents - Steadystate tube furnace - Second Edition
 N TS 19700

Annotation

The data on toxic product concentrations and yields obtained using this document can be used as part of the estimation of toxic potencies, in conjunction with toxic potency calculation methods in ISO 13344, and as an input to the toxic hazard assessment from fires in conjunction with fire growth and effluent dispersal modelling, and fractional effective dose (FED) calculation methods in ISO 13571.

This document describes a steady-state tube furnace (SSTF) method for the generation of fire effluent for the identification and measurement of its constituent combustion products, in particular, the yields of toxicants under a range of fire decomposition conditions

It uses a moving test specimen and a tube furnace at different temperatures and airflow rates as the fire model. The interlaboratory reproducibility has been assessed with selected homogenous thermoplastic materials and this document is therefore limited in applicability to such materials. The method is validated for testing homogeneous thermoplastic materials that produce yields of a defined consistency. See limitations in Clause 12

This method has been designed as a performance-based engineering method to provide data for input to hazard assessments and fire safety engineering design calculations. The method can be used to model a wide range of combustion conditions by using different combinations of temperature, non-flaming and flaming decomposition conditions and different fuel/oxygen ratios in the tube furnace. These include the combustion conditions for the following types of fires, as detailed in ISO 19706:2011

— Stage 1: Non-flaming: