Oxygen System Cleaning for Propulsion and Life Support

Solstice® PF-HP is an ultra clean, highly effective, nonflammable cleaning solution, with desirable safety and environmental attributes. It is ideally suited for oxygen system cleaning for propulsion and life support in commercial aircraft, military, and spacecraft applications.

Some benefits include:

  • Excellent cleaning and quick drying
  • NASA approved (preferred replacement for AK-225G in oxygen system cleaning)
  • Passed NASA LOX explosion test
  • Non-volatile residue (NVR): < 2 ppm
  • Contains no stabilizers or additives, which can contribute to NVR
  • Good stability and materials compatibility
  • Considered a replacement for HCFC-225, HFCs, HFEs, TCEs, nPBs, and other solvents


It is critical that oxygen lines and parts used in oxygen service are completely clean and free of debris. Based on hydrofluoro-olefin (HFO) technology, Solstice PF-HP is well suited for oxygen line cleaning due to its ability to effectively remove contamination from the desired lines or parts and then be completely dried. The vapor pressure of Solstice PF-HP facilitates quick evaporation and drying of cleaned materials.


Solstice PF-HP is a safe and effective choice for cleaning parts used in oxygen service. It is manufactured and specially packaged to deliver an NVR specification of less than 2 parts per million (ppm). It can be used in vapor degreasing equipment, cold cleaning, NVR verification, and tube flushing.

Some additional benefits include:

  • Dissolves typical soils encountered in military and aerospace cleaning
  • Quick drying time can reduce cleaning cycle time
  • Compatible with commonly used metals in the aerospace industry (tested according to SAE Aerospace Recommending Practices (ARP) 1755B)
  • NASA’s metal compatibility tests also showed good compatibility
  • Contains no stabilizers or additives (which can leave behind residues)
  • Has a high wetting index compared to many alternative solvents (facilitates rapid cleaning of intricate parts)

Cleaning Power

With its excellent solubility, Solstice PF-HP is able to dissolve many typical soils encountered in military and aerospace cleaning. Here is a selection of some of the soils that have been tested and can easily be dissolved with Solstice PF-HP:

  • Mineral oils
  • Silicone oils and grease
  • Cutting oils
  • Heavy grease
  • Vacuum oils
  • Refrigerant oils
  • Fluorinated oils

Solstice PF-HP Spray

Solstice PF-HP is available as bulk and also as a spray. With Solstice PF-HP Spray, you receive the same outstanding performance delivered by Solstice PF-HP, but as a spray that is convenient for cleaning certain types of parts and components.


Favorable health, safety, and environmental attributes:

  • Nonflammable (ASTM E-681 and EU A11)
  • Ultra-low GWP of 1
  • Listed under the Significant New Alternatives Policy (SNAP) per U.S. EPA
  • Non-ozone-depleting
  • VOC-exempt (per U.S. EPA and California’s South Coast Air Quality Management District)
  • Low order of toxicity: OEL-800 ppm (WEEL)
  • Very low MIR and POCP values