TABLE 2-1 Physical Properties of CF3I

Physical or Chemical Property

Value or Description

Chemical Abstracts Service no. (CAS)

2314-97-8

European Chemical no. (EC)

219-014-5

Molecular weight

195.91

Physical state at 20°C

Gas

Melting point

–110°C (166°F)

Boiling point at 1 atm

–22.5°C (8.5°F)

Liquid density at -32.5°C

2.36 g/mL

Liquid density at 25°C

g/mL

Odor threshold

Odorless

Solubility in water

Slight

Vapor pressure at 25°C

78.4 psia

Pressure-temperature curve

log psia = 5.7411-1146.82/T/K

Critical pressure

586 psia (estimated)

Critical temperature

122°C (estimated)

Critical volume

225 cm3/mole (estimated)

Heat of formation

–141 kcal/mole

Heat of vaporization

5.26 kcal/mole

Electron affinity

150 ± 20 kJ/mole

Refractive index (liquid) at 42°C

1.379

Dipole moment

1.68 debye

Vapor heat capacity

16.9 cal/mole-K

C-I bond disassociation energy

54 kcal/mole

Vapor density (air = 1)

6.9a

aData from PTCL 2003.

Abbreviations: g/mL, gram per milliliter; cm3/mol, cubic meter per mole; kcal/mole, kilocalorie per mole; kJ/mole, kilojoule per mole; cal/mole-K, calorie per mole Kelvin; psia, pounds per square inch absolute.

Source: Adapted from Moore et al. 1994 (see Appendix B).

EFFICACY

The “Efficacy” section of the update indicates that the minimal design concentration—that is, the minimal amount of a chemical required to extinguish an n-heptane fire—of CF3I, 3.2 vol%, is slightly lower than that



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