Grease PFMS-4S (TU 6.02.917-79) is a polymethylphenylsiloxane fluid solidified with colloid graphite.
The basic operational characteristics: at flow characteristics have it a intermediate position between greases and pastes. Grease PFMS-4S possess the raised antiscuff properties, high thermal stability and low vaporability. It is efficient at temperature -30°С…+300°С, it is short-term to +400°С.
Scope: aviation friction units, slow-speed bearings of a rolling, screw ball transfers, carvings.
Appearance and colour: Viscous unctuousblack weight
Viscosity effective, Па.с, at 50°С, no more: —
Viscosity effective, Па.с, at-30°C, no more: —
Strength at 20°С, the Pas, not less: —
Drobfall temperature, °С, not more low: —
Colloid stability at loading, %, no more: —
The content of free alkali in recalculation on NаОН, %, no more: —
Penetration at 25°С, mm, 10-1: —
The content of water, %, no more: Absence
Vaporability at 300°С within 1 hour, %, no more: 16
Reaction of environment (рН a water extract): 6-8
Data on operational temperatures represent values which are guided by a structure of lubricants, and also on a scope and technology of use. Depending on a kind of mehaniko-dynamic loading lubricants change the consistence, conditional viscosity or viscosity at various temperatures, pressure and duration of operation. These changes of indicators can affect work of components.