Phosphorus Pentafluoride | PF5 Gas

Q1. What is Phosphorus Pentafluoride, and what are its chemical identifiers?

A：Phosphorus Pentafluoride is an inorganic phosphorus halide with the molecular formula PF₅. Its CAS registry number is 7647‑19‑0, and it is also known by synonyms such as phosphorus(V) fluoride or pentafluorophosphorane. This compound is a colorless, toxic, and corrosive gas at room temperature.

Q2. What are the key physical and chemical properties of Phosphorus Pentafluoride?

A：Phosphorus Pentafluoride is a gas with a molecular weight of 125.97 g/mol. It has a boiling point of approximately ‑84.6 °C and a melting point of ‑93.8 °C. It is highly reactive with water, moisture, and alcohols, releasing hydrogen fluoride (HF) and phosphoric acid derivatives. Its vapor density is heavier than air, and it is non‑flammable but strongly oxidizing in some reactions.

Q3. Is Phosphorus Pentafluoride classified as a hazardous substance, and what are the main health and safety risks?

A：Yes, Phosphorus Pentafluoride is classified as a dangerous good under GHS. It is acutely toxic by inhalation (H330), causes severe skin burns and eye damage (H314), and is very toxic to aquatic life (H400). Its reaction with moisture generates corrosive and highly toxic hydrogen fluoride gas. Proper respiratory protection, chemical‑resistant gloves, and eye/face protection are mandatory when handling this product.

Q4. What are the recommended storage conditions for Phosphorus Pentafluoride to ensure stability and safety?

A：Phosphorus Pentafluoride must be stored in tightly sealed, corrosion‑resistant cylinders (typically stainless steel or Monel) in a cool, dry, and well‑ventilated area. The storage temperature should be kept below 50 °C and away from direct sunlight, ignition sources, and incompatible materials such as water, alkalis, and reducing agents. Cylinders should be secured upright and equipped with pressure relief devices.

Q5. How should Phosphorus Pentafluoride be transported, and does it fall under dangerous goods regulations?

A：Yes, Phosphorus Pentafluoride is subject to international dangerous goods transport regulations. Its UN number is UN 2198, with hazard class 2.3 (toxic gas) and subsidiary hazard class 8 (corrosive). The proper shipping name is “Phosphorus Pentafluoride, compressed.” Transportation must comply with IATA/DGR, IMDG Code, ADR/RID, and local regulatory requirements, using approved cylinders and vehicles with proper hazard labeling.

Q6. What emergency measures should be taken in case of a leak, spill, or exposure to Phosphorus Pentafluoride?

A：In the event of a leak, evacuate the area immediately and isolate the source if safe to do so. Use self‑contained breathing apparatus (SCBA) and full protective clothing. Do not apply water directly to the leaking cylinder; instead, use dry inert gas or alkaline neutralizers for containment. For inhalation exposure, move the victim to fresh air and seek urgent medical attention. For skin/eye contact, flush with copious water for at least 15 minutes and obtain immediate medical evaluation.

Q7. What purity grades and specifications are available for Phosphorus Pentafluoride, and what analytical methods are used?

A：We offer Phosphorus Pentafluoride in various purities, typically ranging from technical grade (≥99.0%) to high‑purity electronic grade (≥99.99%). Each batch is supplied with a certificate of analysis (COA) that includes assay value, impurities such as HF, oxygen, nitrogen, and metal content. Analytical methods include gas chromatography (GC), Fourier‑transform infrared spectroscopy (FTIR), and ion chromatography (IC) for trace acidic components.

Q8. What packaging options are provided for Phosphorus Pentafluoride, and can custom packaging be arranged?

A：Standard packaging includes high‑pressure steel cylinders (e.g., 10 L, 40 L, or 50 L) equipped with CGA/DISS compatible valves. Customized cylinder sizes, valve types, and filling pressures can be arranged upon request, subject to minimum order quantities and safety approval.

Q9. What is the shelf life of Phosphorus Pentafluoride, and how should its stability be monitored over time?

A：Under proper storage conditions (dry, cool, and away from moisture), Phosphorus Pentafluoride has a shelf life of typically 24 months from the date of manufacture. However, because it is highly moisture‑sensitive, periodic re‑testing of purity and acid content (HF level) is recommended every 6‑12 months, especially before critical applications. Pressure monitoring and visual inspection of cylinder integrity are also advised.

Q10. Are there any specific regulatory restrictions or certifications required for using Phosphorus Pentafluoride in different industries?

A：Yes, applications in semiconductor manufacturing, pharmaceuticals, or specialty chemical synthesis may require additional compliance with REACH (EU), TSCA (US), or China’s “Measures on Environmental Management of New Chemical Substances.” Export/import licenses may be needed due to its toxicity and potential use as a precursor. Users are responsible for verifying all local and international regulations, including occupational exposure limits (OELs) and reporting obligations under accidental release laws.