Mobil Beacon 325 (5 Gal. Pail)
Mobil Beacon 325 is a high performance synthetic grease specifically designed for precision equipment operating at moderate to low temperatures. It provides superb lubrication in a wide variety of small bearings and gears over a wide range of temperatures, and is an excellent choice as a gear and bearing lubricant in "sealed-for-life" units in aircraft, automotive and industrial applications. Due to its high viscosity index, it operates well at low temperatures and has good pumpability. It is also highly resistant to water, has extremely high oxidation stability, and good mechanical stability. The recommended temperature range for continuous operation is -50° C to 120°C.
Mobil Beacon 325 is formulated with an organic ester synthetic oil. See "Applications" below for notes.
BEACON 325 is a member of the Mobil brand of lubricating products recognized for their high quality and reliability, as well as performance capabilities. As with other Mobil greases, this product is manufactured to the strictest quality standards. A key feature of BEACON 325 is its use of a synthetic fluid to provide optimum performance for low temperature precision applications. BEACON 325 offers the following quality features:
Special synthetic base oil provides excellent low-torque and low temperature properties
Excellent oxidation stability for extended grease life needed for filled for life applications
Very good water resistance ensures proper lubrication even in the presence of incidental water contamination
Low volatility base oil permits operation at moderate to high temperature without fluid evaporation
Application notes: BEACON 325 is formulated with an organic ester synthetic oil. This synthetic oil may cause a softening or swelling of certain plastics, elastomers, paints, or varnishes. How serious the softening or swelling tendency may be depends also on the temperature and the period of contact. Contact your local ExxonMobil lubricants representative for further information on materials compatibility.
BEACON 325 provides excellent service in a wide variety of small bearings and lightly loaded gears that operate over a wide temperature range, including such applications as:
Naval, marine, and aircraft instruments and control mechanisms
Geared limit switches in Limitorque valve actuators
Commercial and military electronic equipment
Sealed for life motors, generators, and similar equipment in automotive, aviation and industrial applications
|Beacon 325 meets or exceeds the requirements of:|
|Penetration, Worked, 25 ºC, ASTM D 217||285|
|Dropping Point, ºC, ASTM D 2265||180|
|Viscosity of Oil, ASTM D 445 cSt@40º C||12|
|Apparent Viscosity, ASTM D 1092|
|@ 20sec-¹ and -40º C, Poise||7,000|
|@ 50sec-¹ and -40º C, Poise||3,500|
|Oil Separation, FTMS 791B321.3, 30 hrs @ 100º C, mass %||4|
|Corrosion Prevention, ASTM D 1743||Pass|
Regarding the use with Buna O-rings, we are not certain. We always recommend using the lubricants recommended by your equipment manufacturer.
It is also not recommended for substitution with Mobilgrease 28. Mobil Beacon 325 has a lithium thickener and an ester synthetic base oil while Mobilgrease 28 has a clay-based thickener and a PAO synthetic base oil. Though these two greases have the same NLGI grade 1.5, they are are incompatible.