BRAND OVERVIEW
SantoVac®
SantoVac fluids falls within the class of PPEs (Polyphenyl Ethers).
PPEs are considered the fluids of choice since they have low volatility and are resistant to thermal degradation at temperatures reaching 450°C (840°F), the highest in the synthetic fluids class. Because of the low volatility and ability to withstand extremely high temperatures, SantoVac fluids are suitable for use in equipment that operates in extreme environments, such as those encountered in aerospace applications, and as diffusion pump fluids. In addition to these attributes, these fluids are resistant to chemical and ionizing radiation attacks, which makes their use suitable in and around equipment that operates in chemical and ionizing radiation-producing environments.
Low volatility
High vacuum
performance
Extended
pump life
What It Is Used For
SantoVac products to perform in extreme conditions, as are found in aerospace applications, diffusion vacuum pumps, high-temperature heat transfer applications, and adverse chemical environments.
Vacuum pumps
High-vacuum systems
Clean processing environments
Analytical and laboratory systems
Semiconductor and electronics environments
Key Benefits
Low volatility
Minimizes vapor pressure for cleaner systems and longer fluid life.
Thermal stability
Resists breakdown at elevated temperatures for reliable performance.
Chemical inertness
Resists oxidation and chemical reaction for maximum compatibility.
Long service life
Engineered to extend pump life and reduce maintenance intervals.
Product Series / Variants
SantoVac® Vacuum Fluids
High-performance vacuum fluids formulated for a wide range of vacuum pumps and systems. Designed for low volatility, excellent chemical stability, and long service life across both roughing and high-vacuum applications.
SantoVac® PPE Fluids
Advanced hydrocarbon-based solutions that offer a reliable alternative to PPE and PFPE fluids. Designed to deliver exceptional volatility control, thermal stability, and environmental profile.
Product Series / Variants
SantoVac® 5 PPE
Industry-standard PPE vacuum diffusion pump fluid. Produces ultra-high vacuum of 5×10⁻¹⁰ Torr or greater at 25°C. The most economical and reliable pump fluid available for commercial diffusion pumps.
- 5×10⁻¹⁰ Torr ultimate vacuum
- MIL-L-87100 compliant
- Zero backstreaming
- Long service life
SantoVac® 5P Ultra
Ultra-high-purity PPE diffusion pump fluid for critical applications requiring contamination-free ultra-high vacuum environments. Extremely low backstreaming characteristic from very high purity refinement.
- Ultra-high purity grade
- Minimal backstreaming
- Semiconductor qualified
- Contamination-free operation
SantoVac® 9
Latest-generation performance vacuum fluid providing a cost-effective solution for commercial vacuum system engineers. Produces ultra-high vacuum of 10⁻⁸ Torr or greater at 25°C with durability and long life.
- 10⁻⁸ Torr ultimate vacuum
- Cost-effective PPE technology
- Durable and long-lasting
- Commercial pump optimized
OS-124
High-temperature PPE base fluid with exceptionally low volatility and resistance to degradation from heat, oxygen, and chemical attack. Compatible with most metals, plastics, and elastomers. Essentially nontoxic.
- Exceptional low volatility
- Heat/oxygen/chemical resistant
- Broad material compatibility
- Low toxicity profile
OS-138
High-temperature PPE base fluid for extreme environments. Same exceptional stability as OS-124 in a different viscosity grade. Compatible with most metals, plastics, and elastomers. Essentially nontoxic.
- High-temperature base fluid
- Extreme environment rated
- Broad material compatibility
- Low toxicity profile
OS-105 ADE
Alkylated diphenyl ether derivative with good broad-temperature properties and high thermal stability. Excellent candidate as a base oil for specialty lubricants and greases.
- Alkylated diphenyl ether
- Broad temperature range
- Specialty grease base oil
- High thermal stability
OS-750 Advanced
Specially formulated PPE fluid with enhanced thermal stability characteristics beyond standard PPE. Possesses all the excellent thermo-oxidative properties of PPE with superior high-temperature endurance.
- Enhanced thermal stability
- Advanced PPE formulation
- Superior oxidation resistance
- Extreme temperature rated
Target Industries
Industrial Manufacturing
Electronics
Aerospace
Research & Laboratory
Semiconductor
Related Applications
Related Products
Fluids
Specialty synthetic and functional fluids
Lubricants
High-performance lubricants and greases
Specialty Chemicals
Process chemicals and cleaning solutions
Custom Solutions
Tailored formulations and private label
Technical Resources
Samples & Technical Support
Request samples or get expert support from our technical team.
FAQ
Expert guidance and resources to help you find the right solution.
What is SantoVac® and what makes it different from other vacuum pump fluids?
SantoVac® is a family of Polyphenyl Ether (PPE)-based vacuum fluids engineered for applications where conventional pump fluids fall short. What sets SantoVac apart is the inherent chemistry of PPE — not additive packages. PPE fluids deliver the lowest volatility of any synthetic fluid class, thermal stability up to 450°C (840°F), and natural resistance to oxidation, chemical attack, and ionizing radiation. The result is a fluid that outperforms under extreme conditions and stays in service longer, reducing pump maintenance and downtime.
What ultimate vacuum level does SantoVac® 5 PPE achieve?
SantoVac® 5 PPE produces an ultimate vacuum of 5×10⁻¹⁰ Torr or greater at 25°C — among the deepest achievable with a diffusion pump fluid. It is MIL-L-87100 compliant, exhibits essentially zero backstreaming, and is recognized as the industry benchmark for commercial vacuum diffusion pump operation. It balances extreme vacuum performance with long service life and cost-effective operation.
What is the difference between SantoVac® 5 PPE and SantoVac® 5P Ultra?
Both are PPE-based diffusion pump fluids, but they serve different application demands. SantoVac® 5 PPE is the industry-standard choice for commercial vacuum systems requiring ultra-high vacuum performance. SantoVac® 5P Ultra is a higher-purity refinement of the same chemistry, developed specifically for semiconductor fabrication and other critical processes where any level of contamination is unacceptable. Its extremely low backstreaming characteristic — a direct result of elevated purity — makes it the preferred fluid for clean-room and contamination-sensitive environments.
Is SantoVac® a PFAS-free vacuum fluid?
Yes. SantoVac® PPE fluids are Polyphenyl Ether-based — not PFAS (Per- and Polyfluoroalkyl Substances). As regulatory pressure on PFAS compounds increases across industries, SantoVac® provides a proven, high-performance alternative that meets or exceeds the vacuum performance of PFPE fluids without the environmental and compliance liabilities. SantoVac® is an established PFAS-free option with decades of service history in aerospace, semiconductor, and industrial vacuum applications.
What industries and applications use SantoVac® fluids?
SantoVac® fluids are specified across a broad range of demanding industries and applications, including aerospace systems, semiconductor fabrication, electronics manufacturing, analytical and laboratory instrumentation, high-vacuum research environments, and industrial manufacturing. Any application requiring a stable, low-volatility fluid that maintains performance under high temperature, chemical exposure, or radiation is a candidate for SantoVac®.
How does SantoVac® extend vacuum pump life?
SantoVac®'s low volatility means less fluid is lost to evaporation during operation, keeping vapor pressure minimal and the system cleaner over time. Its thermal stability prevents fluid breakdown at elevated operating temperatures, and its chemical inertness eliminates the reactive degradation that shortens pump service intervals with conventional fluids. The cumulative effect is longer fluid life, fewer fluid changes, reduced pump wear, and lower total cost of ownership compared to standard synthetic or mineral-based pump fluids.
How do I select the right SantoVac® product for my vacuum system?
Selection depends on your required vacuum level, operating temperature, purity demands, and system type. SantoVac® 9 is optimized for commercial diffusion pumps requiring reliable 10⁻⁸ Torr performance at a lower cost. SantoVac® 5 PPE targets applications demanding 5×10⁻¹⁰ Torr with MIL-spec compliance. SantoVac® 5P Ultra is the choice when contamination-free, semiconductor-grade purity is required. Base fluids OS-124, OS-138, and OS-105 ADE are used in specialty lubricant and grease formulation. SantoLubes engineers are available to review your operating parameters and recommend the right grade — contact the technical team directly for application support.
