Octafluorocyclobutane, also known as perfluorocyclobutane or PFCB, has the chemical formula C4F8 and the CAS number 115-25-3. This compound is a member of the perfluorocarbon family and is primarily used in the semiconductor industry and as an inert gas in various applications. Below are some key characteristics of octafluorocyclobutane:
Physical Properties:
Appearance: Colorless gas at room temperature and pressure.
Boiling Point: Around −38.1 °C (−36.6 °F).
Melting Point: Around −135.4 °C (−211.7 °F).
Density: Higher than air, approximately 5.1 g/L at 0 °C (32 °F) and 1 atm.
Solubility: Insoluble in water but can dissolve in some organic solvents.
Chemical Properties:
Stability: Stable under normal conditions but can decompose when exposed to very high temperatures or strong UV light, potentially releasing toxic and corrosive gases like HF (hydrogen fluoride).
Reactivity: Generally unreactive with most common substances; however, it can react violently with strong oxidizing agents.
Uses:
Semiconductor Industry: Used as an etchant and cleaning agent in semiconductor manufacturing processes.
Medical Applications: Used as a contrast agent in medical imaging techniques like ultrasound.
Inert Gas: Used as an inert gas in various applications where an oxygen-free environment is required.
Propellant: Sometimes used as a propellant in aerosols due to its stability and low reactivity.
Environmental Impact:
Greenhouse Gas: Octafluorocyclobutane is a potent greenhouse gas with a high global warming potential (GWP) over a 100-year period.
Ozone Layer: It does not deplete the ozone layer but contributes significantly to climate change due to its long atmospheric lifetime and high GWP.
Suppliers:
When handling octafluorocyclobutane, ensure that you have proper ventilation, wear appropriate personal protective equipment (PPE), and have access to emergency response procedures. Always store it in a cool, dry place away from incompatible materials and sources of ignition.