Mobil Rarus PE KPL 201

Ethylene and co-monomers compressor oil

Mobil Rarus™ PE KPL 201 is a medium viscosity, colourless oil, of viscosity slightly above ISO VG 100.  It is based on high purity, saturated hydrocarbon oils, supplemented with friction-reducing and free-radical trap additives at adapted treat levels


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Data sheets

Features and Benefits

  • Low reactivity components. Do not interfere with polymerisation reactions.
  • High purity components. Do not induce any discolouration or odour in the final polymer.
  • Components approved for food contact. Suitable for the manufacture of polymers for food packaging containers.
  • Reduced maintenance shutdowns
  • Low polarity. Suitable in the manufacture of polymers for electrical insulation and thin sheets (plastic bags).



Mobil Rarus PE KPL 201 is specifically designed for the lubrication of very high pressure ethylene and co-monomers compressors.  It may be used up to 3400 bars, according to oil injection system and temperature.

Mobil Rarus PE KPL 201 is formulated for the most demanding applications.  Its viscosity and composition are tailored for the highest pressures found in ethylene compressors for LDPE production.  The viscosity increase under the highest pressures remains low enough to ensure an adequate flow of lubricating oil.

Additives also prevent the early polymerisation of reactive gas components and impurities into the compressor itself, which may lead to formation of sludge, and eventually to lubrication failure.  Additives also mitigate friction losses and bushing wear.  As a result shutdowns for maintenance are less frequent.


Specifications and Approvals

Mobil Rarus PE KPL 201 meets or exceeds the requirements of: 
FDA 21 CFR 178.3570X
European Directive 2002/72/ECX
US Pharmacopeia, USP-NF <661> (vol. 1, 2008)X
FDA, Processing Aid in production of polymers compliant with 177.1520X


Mobil Rarus PE KPL 201 is registered to the requirement of: 
NSF Registration Number146247


Typical Properties

Test MethodTestUnitsMobil Rarus PE KPL 201
Density at 15°C (typical)ASTM D4052kg/m3874
Kinematic viscosity at 40°C (typical)ASTM D 445mm2/s117
Colour, Saybolt (tyoical)ASTM D156 +27
Flash Point (typical)ASTM D 92°C230
Pour Point (max)ASTM D 97°C- 12
Acid number (typical)ASTM D 974mg KOH/g0.5
Water content (max)ASTM D 6304ppm100


Health and Safety

Based on available information, this product is not expected to produce adverse effects on health when used for the intended application and the recommendations provided in the Material Safety Data Sheet (MSDS) are followed. MSDS's are available upon request through your sales contract office, or via the Internet or will be provided by seller to customers if and as legally required. This product should not be used for purposes other than its intended use. If disposing of used product, take care to protect the environment.