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Comparison of toxic product yields of burning cables in bench and large-scale experiments

By T Richard Hull, K. Lebek, M. Pezzani and S. Messa

Abstract

Toxic product yields from five commercial cables obtained from a steady state tube furnace (SSTF) method (lEC 60695-7-50, Purser furnace) are compared with results from a large-scale test, which uses the physical fire model in the proposed prEN50399-2-2 test, with the addition of effluent gas analysis, using Fourier transform infrared (FTIR), and for further comparison, a static tube furnace method (NF X 70-100). This work represents one of the first attempts to establish a relationship between bench- and large-scale toxic product yields for burning cables. This is difficult because the cables have been formulated for low flammability, and therefore do not burn consistently. The tube furnace burns the cable completely, whereas the large-scale test effluent is the result of a combination of flame spread and toxic product yields, both of which are fire scenario dependant. There is significant differentiation between cable types based on composition, and arising because only a portion of the cables burn in the large-scale test, accompanied by possible decomposition of hydrate sheaths. The fire stage of the large-scale test appears to have been replicated in an appropriate manner, given the correspondence of the CO2/CO ratios. The yields of CO2, CO, HCl and smoke show reasonable agreement, given the differences in the extent of burning, and the accuracy of the mass-loss data available for the large-scale test. The yields and extent of burning have been combined to demonstrate the estimation of toxic hazard for a particular fire scenario based around the large-scale test, which shows only marginal sensitivity to the differences in toxic product yield between the SSTF and the large-scale test. (c) 2007 Elsevier Ltd. All rights reserved

Topics: F100
Publisher: Elsevier
Year: 2008
OAI identifier: oai:clok.uclan.ac.uk:1065
Provided by: CLoK

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Citations

  1. 13571:2001 Life threat from fires – Guidance on the estimation of time available for escape using fire data
  2. 19706:2004, Guidelines for assessing the fire threat to people.
  3. (1998). An Introduction to Fire Dynamics, 2nd Edition, pub.
  4. (2002). Critical Reviews in
  5. Fire hazard testing – Toxicity of fire effluent
  6. (2001). Hischler in Fire and Polymers: Materials and Solutions for Hazard Prevention,
  7. ISO 13344:1996 (Estimation of lethal toxic potency of fire effluents).
  8. (2005). Milnes, in Fire Retardancy of Polymers,
  9. (2002). Toxicity Assessment of Combustion Products

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