Types of industrial lubricants: How to choose the right one

Types of industrial lubricants directly influence asset lifespan and performance.

In practice, oils, greases, and solid lubricants each work differently to reduce friction, control wear, dissipate heat, prevent contamination, and preserve surfaces in contact.

That’s why understanding their characteristics is essential to avoid generic choices and apply the right product for each working condition.

Beyond reducing friction and wear, industrial lubrication helps control heating, protect components, and prevent mechanical failures linked to improper application.

For that reason, lubrication should be treated as a technical and strategic maintenance practice, not just a routine operational task.

In this article, you’ll learn about the main types of industrial lubricants, including oils, greases, and solid lubricants, along with the criteria for choosing the right option for each application.

We’ll also cover industrial lubrication methods, the most common mistakes in the process, and how lubrication management connects to asset reliability and predictive maintenance.

What are the main types of industrial lubricants?

Industrial lubricants generally fall into three main types: liquid, semisolid, and solid. Each has its own application characteristics, resistance, and performance profile. Here’s a closer look:

Liquid lubricants: industrial oils

Mineral oils

Derived from petroleum refining, mineral oils are widely used across industry thanks to strong overall performance and competitive cost.

They can also receive additives to improve resistance to oxidation, corrosion, and wear.

They’re applied in hydraulic systems, gearboxes, compressors, turbines, and rotating machinery.

For this type of application, oil viscosity is a determining factor in selection. It’s classified according to the ISO VG scale (ISO 3448), which establishes grades such as ISO VG 32, 46, 68, 100, 220, and 320 based on kinematic viscosity at 40 °C.

Fatty oils

Derived from vegetable or animal sources, fatty oils offer good lubricity and adhere well to the lubricating film.

For example, they’re typically used in low-speed, high-load, or boundary-friction applications, such as guides, chains, sliding busbars, and some machining operations.

Compound oils

Compound oils combine mineral oil, fractions of fatty oils, and additives. This formulation aims to unite the stability of mineral oil with the higher lubricity and adhesion of fatty oils.

They’re recommended for specific low-speed, high-load, and boundary-friction applications, such as some guides, chains, and systems requiring greater adhesion. For open gears, selection should focus on lubricants designed specifically for that application, based on load, speed, application method, and manufacturer recommendations.

For enclosed industrial gears, ISO 6743-6 classifies lubricants in family C, while ISO 12925-1:2024 sets specifications for lubricants used in enclosed gear systems.

Semisolid lubricants: industrial greases

According to the NLGI (National Lubricating Grease Institute), semisolid lubricants, also known as semisolids or semifluids, are a blend of three main components: a lubricating fluid, additives, and a thickener. The thickener is what sets grease apart from liquid lubricants, giving it its semisolid consistency.

Industrial greases are recommended when it’s important to keep the lubricant at the application point for longer, reducing runoff and helping protect surfaces.

Greases can also be classified mainly by two criteria:

Base oil type: it can be (1) mineral, (2) synthetic, or (3) semisynthetic. The base oil influences thermal stability, oxidation resistance, and performance under severe conditions.

Thickener type: it can be (1) conventional soap, (2) complex soap, or (3) non-soap. The thickener affects properties such as water resistance, mechanical stability, adhesion, and working temperature range.

Grease consistency is usually expressed by the NLGI grade, ranging from 000 to 6, based on worked penetration measured by methods such as ASTM D217 or ISO 2137.

Grease consistency is usually expressed by the NLGI grade, ranging from 000 (very fluid) to 6 (very stiff), defined through a cone penetration test according to ASTM D217 or ISO 2137.

This classification, established by the NLGI, is widely used across industry as a reference for grease selection and specification.

ISO 12924 complements that reference by setting technical specifications for lubricating greases in family X, while ISO 6743-9 classifies greases by family, condition, and application use.

That’s why industrial greases are common in applications such as bearings, journal bearings, pins, joints, universal joints, couplings, and points that are hard to access or have long relubrication intervals.

Solid lubricants

Solid lubricants are materials applied between contacting surfaces to reduce friction when oils and greases can’t maintain adequate performance.

They’re mainly used in severe conditions, such as high temperature, high load, low speed, vacuum, dust exposure, or difficult relubrication access.

The most commonly used materials include graphite, molybdenum disulfide (MoS₂), PTFE, and some oxides or solid compounds.

These materials are also incorporated as additives in specialty greases for extreme applications, as described by the NLGI in the context of formulations with solid fillers.

How do you choose the right industrial lubricant for each application?

Choosing the right industrial lubricant depends on the asset’s actual operating conditions. Beyond the type of lubricant, it’s necessary to evaluate the following factors:

• Operating temperature: it influences viscosity, fluidity, thermal stability, and oxidation resistance. Paraffinic oils, for example, tend to show greater stability at high temperatures, while naphthenic oils tend to offer better fluidity at low temperatures.
  
• Regulatory requirements and work environment: in segments such as cosmetics, pharmaceuticals, and technical rubber, it may be necessary to prioritize base oils with low PAH content, meaning polycyclic aromatic hydrocarbons. In applications with incidental contact with food or regulated products, ISO 21469 defines the hygiene requirements for lubricants used in these environments. The environment should also be assessed for the presence of water, dust, chemical agents, or contamination risk. For hydraulic fluids in environmentally sensitive settings, ISO 15380:2023 sets requirements for environmentally acceptable hydraulic fluids in the HETG, HEPG, HEES, and HEPR categories.
  
• Cost versus performance: the choice should consider whether the process demands high stability and a longer service life, which justifies higher-performance base oils, or whether a simpler, more economical solution already meets the working conditions safely.
  
• Compatibility with the asset and the process: it’s necessary to evaluate manufacturer recommendations, seal materials, component type, application history, and the possibility of mixing with previously used lubricants. In hydraulic systems, ISO 4406 defines the contamination code for solid particles in fluids, used to control oil cleanliness in service, a factor relevant both to lubricant selection and monitoring.
  

As a result, choosing correctly prevents decisions based solely on price or stock availability.

Industrial lubrication methods

In industry, the main methods are manual or mechanical lubrication, and semi-automatic or automatic lubrication. Application can happen through an individual system, point-to-point, or centralized system.

This choice affects process standardization, application frequency, the amount of lubricant used, and control over maintenance activities.

Here’s a closer look at the difference:

Manual or mechanical lubrication

Manual or mechanical lubrication is performed directly by a technician at each point on the asset. It relies on grease guns, grease pumps, manual applicators, or specific containers for oil and grease.

In this model, frequency, applied quantity, and activity records depend on operational routine and maintenance team oversight. It’s therefore a method that requires defined procedures to ensure consistent application.

Centralized or automatic lubrication

Centralized or automatic lubrication is a system that distributes lubricant to multiple application points from a central unit.

In this model, oil or grease is delivered through pumps, hoses, valves, and distribution lines connected to the equipment’s lubrication points.

This allows application to happen in a standardized way with less dependence on manual lubrication, especially for assets with a large number of relubrication points.

Most common mistakes in industrial lubrication

Even with a solid maintenance plan, certain lubrication mistakes can still compromise asset performance.

The most common ones involve the applied quantity, product choice, contamination, and improper mixing between lubricants.

Too much or too little lubricant

A lack of lubricant can prevent the proper formation of the protective film between surfaces. This leads to increased friction, temperature, and wear.

Excess lubricant causes problems too. In grease applications, for example, applying more than necessary can cause overheating, increased resistance to movement, and seal damage.

Using the wrong type of lubricant

Using the wrong type of lubricant happens when the product isn’t compatible with the actual operating conditions, including temperature, load, speed, work environment, and component type.

In this scenario, the lubricant can lose performance, fail to form an adequate film, or fail to withstand the demands of the process.

The choice should therefore follow technical recommendations and the asset’s application history.

Contamination and improper mixing

Contamination from water, dust, solid particles, or process residue reduces lubricant efficiency and speeds up its degradation.

According to the NLGI, mixing incompatible greases can alter product consistency and compromise surface protection. When switching products is unavoidable, compatibility testing under ASTM D6185 is recommended before application.

Proper labeling, adequate storage, and defined procedures for product changes or replenishment are also essential.

How does lubrication management connect to predictive maintenance?

Lubrication management connects to predictive maintenance when lubricant application starts to factor in the asset’s actual condition, rather than fixed frequencies alone.

In this scenario, data such as vibration, temperature, application history, and criticality helps set priorities and guide interventions.

This approach is known as CBM (Condition Based Maintenance), a strategy for monitoring the condition of lubricants in service and predicting failures based on operational data rather than preset time intervals.

This continuous, ongoing monitoring of asset condition, carried out according to the collection strategy, adds an extra layer of confidence when evaluating the effectiveness of time-based plans.

So, alongside time-based relubrication plans, predictive maintenance shows when a problem is likely to occur, what its nature is, and, through in-depth analysis, how to solve it.

Reports generated from asset condition analysis make it possible to identify lubrication problems: too little, too much, or incorrect application.

This gives lubrication an even bigger role in proactive failure-prevention efforts.

This integration helps answer important maintenance questions:

• Which assets need the most attention?
• Is the lubrication frequency adequate?
• Did conditions improve after relubrication?
• Are there recurring signs linked to improper lubrication?

With this, lubrication stops being an isolated activity and becomes part of a continuous improvement cycle: monitor, apply, check the result, and adjust the plan.

This opens the door to solutions that connect condition monitoring and automatic lubrication, such as the integration between Dynamox and Perma.

It’s also worth noting that, beyond vibration analysis, teams can turn to techniques like oil analysis.

In this approach, after collecting the material actually applied to the asset, its functional properties, specific characteristics, and present particles are measured, which also points to possible failures and the system’s degradation level.

Oil analysis therefore works as a complementary predictive technique in lubrication decision-making, helping refine plans, adjust frequencies, and, when necessary, choose a different type of lubricant or application method.

How does Dynamox support lubrication management and monitoring?

Dynamox, a predictive maintenance specialist, integrates lubrication systems and oil analysis to automate lubrication based on the asset’s actual condition, continuously and online.

One example of a system that operates autonomously is the combination of Dynamox with single-point lubricators.

That’s the case with the Dynamox + Perma integration, where condition monitoring connects directly to automatic lubrication.

It works as a small lubricant pump applied right at the relubrication point, dosing lubricant automatically based on operational need and reducing dependence on manual application.

Through asset condition monitoring carried out by Dynamox, teams can build an automation that triggers the single-point lubricator to perform a purge, meaning relubrication, remotely, safely, and at low cost.

In practice, the process works like this:

• Dynamox sensors monitor the asset’s condition.
• The platform identifies behavior changes, such as increased vibration and temperature.
• The analysis indicates whether that behavior could be related to improper lubrication.
• From the Dynamox Platform itself, a signal is sent to trigger the Perma lubricator’s purge.
• Relubrication happens automatically at the monitored point.
• Continuous monitoring makes it possible to assess whether the observed symptoms decreased.

All of this happens within a single predictive platform, with integration, automation, and reliable data for decision-making and results tracking.

Here’s how it works:

This way, lubrication becomes part of a more connected ecosystem, bringing together asset condition, automatic application, and tracking of intervention effectiveness.

Want to apply the right industrial lubricants and connect condition monitoring with automatic lubrication in your operation? Explore Dynamox’s solutions and see how to make your maintenance strategy more connected and data-driven.

Frequently asked questions about types of industrial lubricants (FAQ)