HFC

HFC-227ea

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Product Description

HFC-227ea is a gaseous halocarbon agent containing no particles; it leaves no oily residues on electronic equipment and can be removed from the protected space by ventilation. It is the first environmentally acceptable replacement for Halon 1301.

The present understanding of the functioning of HFC-227ea is that 80% of its fire fighting effectiveness is achieved through heat absorption and 20% through direct chemical means. HFC-227ea is stored as a liquefied compressed gas super pressurized with dry nitrogen to 25 BAR and is discharged into the protected area as a vapor.

Summary of Agent Physical Properties

Chemical Structure

CF3 CHFCF3

Chemical Name

1,1,1,2,3,3,3 – Heptafluoropropane

Molecular Weight

170 g/mol

Boiling Point at 1.013 Bar (abs)

-16.4oC (1.9oF)

Freezing Point

-131oC (-204oF)

Critical Temperature

101.7oC (214oF)

Critical Pressure

29.1Bar (422 psi)

Critical Volume

274 cc/mole (0.0258 cu.ft/lb)

Critical Density

621 kg/m3 (38.76 lb/ft3 )

Specific Heat, Liquid at 25oC

1.184 kJ/kgoC

Specific Heat, 25oC Vapor at constant pressure 1 atm and 25oC

0.808 kJ/kgoC

Heat of Vaporization at Boiling Point

132.6 kJ/kg

Thermal Conductivity of Liquid @ 25oC

0.069 W/moC

Viscosity, Liquid at Centipoise 25°C

0.184

Relative Dielectric Strength @ 1 atm

2

Solubility of Water in Agent @ 21oC

0.06% by weight

Saturated Vapor Density @ 20oC (68oF)

31.18 kg/m3 (1.95 lb/ft3)

Ozone Depletion (ODP)

0

Atmospheric Lifetime

36.5 yrs

No Observed Adverse Effect Level (NOAEL)

9%

Lowest Observed Adverse Effect Level (LOAEL)

>10.5%

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