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C3F8

Octaflouropropane (Halocarbon 218)

Colorless, tasteless, nonflammable, shipped as a liquefied gas under its own vapor with a faintly sweet odor.
Shipping Information
D.O.T. Proper Shipping Name:
Octaflouropropane
I.D. Number:
UN2424
Hazard Class:
2.2
Shipping Labels:
Nonflammable Gas
Technical Information
Molecular weight:
118.0193
Specific volume:
2.06ft3/lb
CAS registry:
76-19-7
SDS ref:
Halocarbon 218
About

Halocarbon 218, also known as perfluoropropane or octaflouropropane (C₃F₈), represents a fascinating example of how increasing molecular complexity affects a compound’s properties. Like its simpler cousin CF₄, this molecule features extremely strong carbon-fluorine bonds, but it has a more complex structure consisting of three carbon atoms in a chain, with each carbon fully bonded to fluorine atoms instead of hydrogen. This arrangement creates a larger, heavier molecule that still maintains remarkable chemical stability due to the protective shell of fluorine atoms surrounding the carbon skeleton. At room temperature, it exists as a colorless, odorless gas with very low toxicity, but its large molecular size gives it interesting physical properties – it’s significantly heavier than air and can be liquefied at relatively moderate pressures.

These properties, combined with its chemical inertness, have made it useful in specialized applications like semiconductor manufacturing and as a cooling agent in specific electronics.

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