Fomblin® VAC PFPE - FAQ

 

 

Frequently Asked Questions

What is the Difference Between Fomblin® PFPE Oil and Fomblin® VAC?

Fomblin® VAC fluids have been specially developed in order to combine narrow molecular weight range and controlled viscosity with an extremely low vapor pressure. Thus, they provide superior performance in high vacuum applications, especially systems exposed to aggressive gases. Solvay Specialty Polymers is able to provide these grades due to its edging technology where distillation step makes us able to design tailor-made products according customer requirements.

What is the Difference Between Fomblin® Y LVAC and Fomblin® Y HVAC?

Fomblin® Y LVAC grades are ideal for use in vacuum pumps as sealing and working fluids especially in those systems exposed to aggressive gases.

Fomblin® Y HVAC combines narrow molecular weight range and controlled viscosity with an extremely low vapor pressure. Thus, they provide superior performance in high vacuum applications as working fluid specially for diffusion pumps.

Based on My Vacuum Pump, which Fomblin® VAC Grade Should I Use?
  Fomblin® Y LVAC Grades Fomblin® Y HVAC Grades
Application 06/6 14/6 16/6 25/6 18/8 25/9 40/11 140/13
Rotary pumps: sealing & lubricant fluid          
Turbomolecular pumps: lubrication              
Root pumps: lubrication            
Diffusion pumps: working fluid        
What is the Kinematic Viscosity Behavior vs. Temp. of Fomblin® VAC Fluids?

Fomblin® Y LVAC viscosity vs. temperature chart

fomblin-y-lvac-viscosity-vs-temperature

Fomblin® Y HVAC viscosity vs. temperature chart

fomblin-y-hvac-viscosity-vs-temperature
What is the Vapor Pressure Behavior vs. Temperature of Fomblin® VAC Fluids?

Fomblin® Y LVAC vapor pressure vs. temperature chart

fomblin-y-lvac-viscosity-vs-temperature

Fomblin® Y HVAC vapor pressure vs. temperature chart

fomblin-y-hvac-vapor-pressure-vs-temperature
Are Fomblin® VAC Additivated Grades Commercial?

Rust Preventive formulation (LVAC RP) was studied to reduce or prevent rusting when huge amount of water vapors has to be pumped or when metal surfaces of the pump are exposed to moisture. An optimum concentration of additive in Fomblin® Y LVAC grades was studied to provide protection against rust and at the same time to guarantee the physical properties and the vacuum performance of the grade.

Anti-rust property evaluation

  • Fog chamber (method ASTM B117)
  • Conditions: temperature = 45 °C, humidity = 90 %
Sample Fluid Fog Chamber Time Corrosion Degree Fog Chamber Time Corrosion Degree
Cast iron Y LVAC 40 mins 5 1 hour > 5
Low carbon steel Y LVAC 40 mins 4 1 hour 5
Cast iron Y LVAC RP 24 hours 0 96 hours 1 – 2
Low carbon steel Y LVAC RP 24 hours 0 96 hours 2

Rating 
0 – No corrosion 
1 – Not more than three small spots of corrosion 
2 – Small areas of corrosion covering up to 1 % of the surface 
3 – Small areas of corrosion covering from 1 % to 5 % of the surface 
4 – Small areas of corrosion covering from 6 % to 10 % of the surface 
5 – Small areas of corrosion covering more than 10 % of the surface

 

Fomblin® PFPE anti-rust additivated grades maintain the same viscosity and vapor pressure behavior than not additivated ones. As the following charts show:

Fomblin® Y LVAC RP – viscosity vs. temperature chart

Fomblin® Y LVAC RP – vapor pressure vs. temperature chart

Are Fomblin® Y LVAC Fluids Food Grade Approved?

Fomblin® Y LVAC 25/6 is NSF approved with the intended use described below:

  • H1: General, incidental contact
  • H2: General, no contact
  • HX-1: Ingredients for use in H1 lubricants, incidental contact
  • HX-2 Ingredients for use in H1 lubricants, no contact