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Grease selection

What is Grease?

Greases are lubricants that provide specific performance properties where lower viscosity oils simply do not work.

Greases consist of three basic types of ingredients, a high-quality base oil, a thickener system and various performance-improving additives.

These versatile lubricants have slightly different compositions, but each lubricant has a similar breakdown of ingredients: 80% to 90% base oil, 10% to 20% thickener and 3% to 5% additive.

Greases are ideal solutions for industrial applications where low viscosity fluids do not provide adequate protection or durability in situ.

Simply put, the lubricant essentially acts like a sponge, the thickener system holds the lubricating oil in place and releases fluid under pressure to prevent wear and damage to the metal surface.

Base oils

Base oil is the liquid component of every lubricant and is a typical lubricating oil - it can be mineral oil, silicone oil, synthetic oil or any liquid with lubricating properties. and viscosity level.


The main thickeners used in the production of lubricants are lithium, aluminum, calcium, bentonite and polyurea, available separately or in various configurations.

Lubricant additives

Refining additives give or modify the properties of lubricants. These are mainly: corrosion and oxidation inhibitors, depressants regulating the pour point, solid lubricants or friction reducing agents: molybdenum disulfide, graphite and dyes.

What are lubricants used for:

  • They prevent surface wear
  • They reduce metal friction - anti-seize pastes
  • They act as a sealant - sealing silicone mixtures
  • Protect against rust and corrosion - coatings
  • They reduce noise and vibration

    How to choose the right lubricant?

    There are many different industrial greases, semi-fluid, lithium-containing, synthetic or mineral oil-based.

    For an ordinary person, choosing a lubricant can be troublesome - where to start?

    There are four main factors that help narrow down the choice of suitable greases:

    1. Load
    2. Environment
    3. Temperature
    4. Speed
    Load The amount of force/stress acting on a component or surface. (Light, Medium or Heavy)
    Environment Operating environment, including low and high temperatures, humidity, exposure to water, chemicals or fuels, and other airborne contaminants
    Temperature The operating temperature of the device or surface, including ambient temperature and peak low and high temperatures
    Speed The type of movement, revolutions per minute, can be classified as low to high speed.
    All these factors help identify the best-suited solution in your lubricant portfolio. If a bearing or other surface is subjected to very high loads, it is important to choose a product that contains the appropriate additive package, such as additional solid lubricants, e.g. molybdenum disulfide MoS2 or graphite. However, if the component is exposed to incredibly high temperatures, it is important to select a grease from a synthetic oil line that exhibits greater thermal stability and longevity, such as high temperature bearing grease.

    Typical difficulties with lubrication with grease

    As any lubrication engineer knows, there are many obstacles that greases or other fluids must overcome during standard operation. Listed below are the most common difficulties faced by greases.

    • Warm
    • pollution
    • Miscibility of lubricants
    • Over-lubrication
    • Wrong lubricant

    NLGI grease consistency


    The NLGI rating expresses a measure of the relative hardness in a lubricant. It is the plastic resistance when a force is applied to deform it.

    In the case of lubricants, it is the hardness or softness that allows the assessment of flow and dosage properties. It is assessed according to the classification and parameters of the National Lubricating Grease Institute (USA).

    NLGI Classes 000 to 1

    They are used in low viscosity applications in Central Lubrication systems requiring good pumpability, or gears requiring a semi-fluid solution.

    NLGI 2 classes

    This is the most common class of greases, including those for rolling bearings.

    NLGI Class 3 and 4

    Thicker consistency used for valves and sealing connections.

    NLGI Class 5 and 6

    These are solid lubricants offered in the form of briquettes

    Why use MOLYKOTE grease? ®

    • Performance at high temperatures exceeding 180°C (356°F)
    • Low temperature performance down to -40°C (-40°F) and in some cases less
    • Resistance to chemicals such as solvents, fuels, acids and many others
    • Good protection against corrosion thanks to resistance to moisture, oxidation and water washout
    • Solid lubricants increasing the protection of wearing surfaces
    • Specialized bases containing silicone, fluorosilicone and PFPE (perfluoropolyether) oils.

    Provide lubrication for heavy-duty applications with industrial greases.

    Regardless of the industry and needs, MOLYKOTE® brand industrial lubricants are resistant to difficult conditions. With a full range of high-performance greases – for solid and semi-solid materials with lubricant, thickener and additives – we have what you need:

    Key applications for these lubricants include gears, all types of bearings, conveyor systems, guides, drives, pumps, valves, seats and shafts. Meet your challenges with effective solutions to your harsh industrial lubrication problems.

    Recommended MOLYKOTE® greases

    These high-performance lubricants provide exceptional friction control, wear resistance and load transfer at high and low temperatures. The following lubricant solutions are NLGI Class 2 compliant and contain an aluminum, polyurea, PTFE or lithium based thickener.

    MOLYKOTE® grease
    Base oil chemistry
    Use or benefit
    Temperature range
    MOLYKOTE BR-2 Plus®
    Mineral oil
    From -20°F to 265°F
    MOLYKOTE G-4500FM®
    PAO (polyalphaolefin)
    NSF H-1 food grade
    From -40°F to 302°F
    MOLYKOTE G-4700®
    PAO (polyalphaolefin)
    Molybdenum (MOS2) Synthetic grease
    From -40°F to 350°F
    MOLYKOTE G-1502FM®
    PAO (polyalphaolefin)
    NSF H-1 food grade
    From -40°F to 300°F
    POE (polyol ester)
    High speed bearings
    From -50°F to 360°F
    MOLYKOTE 33 Medium®
    Silicone oil
    Extremely low temperature
    From -99°F to 400°F
    MOLYKOTE 44 Medium®
    Silicone oil
    Extremely high temperature
    From -40°F to 400°F
    MOLYKOTE 3451®
    Fluorosilicone oil
    Chemical resistance
    From -40°F to 450°F
    There are no products that match your combination of options