Richard,
A book that may help you is 
    Fire Retardancy of Polymeric Materials, 
by Arthur F. Grand and Charles A. Wilkie (New York: Marcel Dekker,
2000).  

Chapter titles are:
1.  The Changing Nature of Fire Retardancy in Polymers.
2.  Chemical Aspects of Thermal Decomposition.
3.  Fire Test Methods for Evaluation of Fire-Retardant Efficacy.
4.  Synergists, Adjuvants, and Antagonists in Fire-Retardant Systems.
5.  Phosphorus-Containing Flame Retardants.
6.  Char Formation.
7.  Intumescence.
8.  Halogen-Containing Fire-Retardant Compounds.
9.  Inorganic Hydroxides and Hydrocarbonates: Their Function and Use as
    Flame-Retardant Additives.
10. Silicon-Based Flame Retardants.
11. Solid-State Thermochemistry of Flaming Combustion.
12. The Performance of Fire Retardants in Relation to Toxicity.
13. Molecular-Level Design of Fire Retardants and Suppressants.
14. Fire-Hazard and Fire-Risk Assessment of Fire-Retardant Polymers.

I borrowed the book from a local technical library just this afternoon,
and have only had time to skim through it.  But the impression that I
got was "It all depends.", just like John Woodgate said in his post.

You may also find pertinent information under "Comparative Tracking
Index" or "CTI".  

                John Barnes KS4GL, PE, NCE, ESDC Eng, SM IEEE
                dBi Corporation
                http://www.dbicorporation.com/


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