Fluoroiodide Blends as Streaming Agents. Selection Criteria and Cup-Burner Results.
Abstract
Fluoroiodocarbons (FIC) - highly effective, 'second-generation' agents -- have been identified as replacements for halons, the production of which ended on 31 December 1993. In an attempt to improve the toxicological characteristics of FICs, to decrease agent cost, and to possibly improve performance as a streaming agent in military applications, blends of FICs with other chemicals are being investigated. This report describes the initial results of the blending work with trifluoroiodomethane (CF3I), the most promising FIC fire suppressant. Toxicities, likely regulatory regulations, and availability indicate that only hydrofluorocarbons (HFC) can be considered at this time for blending with CF3I or other FICs. Seven HFCs (HFC-236fa, -227ea, -143a, -134a, -125,-23, and -4-3-10mee) were selected for initial investigation. Based on the toxicities of CF3I and the proposed blending agents, the final blends should contain 40 percent or less by volume CF3I in order for the cardiac sensitization No Observed Adverse Effect Level (NOAEL) value to be equal to that of Halon 1211. Cup-burner extinguishment concentrations at a 40 percent by volume CF3I concentration ranged from slightly higher to significantly lower than those for pure CF3I. Those agents identified as meeting the criteria for continuation in the program should be tested in laboratory- and field-scale streaming apparatuses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1995
- Accession Number
- ADA309974
Entities
People
- Everett W. Heinonen
- Robert E. Tapscott
- Stephanie R. Skaggs
- Ted A. Moore