CHRISTO-LUBE MCG 109 is a wide temperature range, perfluoropolyether grease for use in extreme environments. christo  It is suited for use in systems where non-reactivity with harsh chemicals including strong acids and oxidizers, fuels, solvents, etc. is mandatory, and in vacuum systems where pressures may be as low as 10 -12 Torr.The grease is suitable for lubricating ball, plain spherical, roller, and needle bearings of large and small diameter. It is also suitable for use in electrical contacts, gears, splines, valves, screw actuators, and in systems employing elastomeric and plastic seals, gaskets, and o-rings. Although CHRISTO-LUBE MCG 109 is very inert, newly exposed rubbing surfaces of aluminum and magnesium may react with the grease under certain extreme conditions.