Smar penetrujący – wszystko, co musisz o nim wiedzieć

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Penetrating greases and oils are low-viscosity fluids that are used to loosen fasteners and other metal elements that are rusty. Most penetrating oils contain a low to medium viscosity solvent that is volatile. The liquid penetrates the metal pores and leaves an oil layer (usually based on a solvent), which causes the water to be displaced and protected against moisture. Penetrating greases and oils can also act as a cleaning agent or corrosion inhibitor.

Penetrating grease – tasks

The main task of penetrants is to loosen seized, corroded elements. The low viscosity of these fluids allows them to penetrate the grooves, gaps or pores that are on each surface. Penetrating oils are usually a mixture of grease and solvent. The solvent is diluted, reducing its viscosity and increasing its mobility.


One of the things that penetrating grease can easily handle is lubrication in a short time. As is usually the case with such agents, the friction is reduced, but because the oil contains a volatile solvent, it is also quickly contaminated. After evaporation, the grease leaves a protective layer. For this reason, penetrating grease contains a mixture of additives that will extend its life.

Cleaning agent

Penetrating grease is an extremely effective cleaning agent. With it you can remove tar, fat, dirt or rust. This is because this liquid can be used as a solvent dissolving agent. After dissolving dirt, simply use a cloth to wipe the cleaned item.

Corrosion resistance

Some of the penetrating agents are used for protection against corrosion. Most penetrants are able to displace water, which results in protection against oxidation. Penetrating fluids displace any moisture from the surface on which they are used. They leave a non-conductive protective layer.


Simple oils

Simple oils are non-emulsifying oils. They are used in undiluted form in machining processes. They are based on petroleum or mineral oils and usually contain polar additives such as vegetable oils, fats, esters or very strong sulfur, chlorine and phosphorus.oleje to oleje nieemulgujące. Są używane w nierozcieńczonej formie w procesach obróbki. Ich podstawą jest ropa naftowa lub oleje mineralne i zazwyczaj zawierają dodatki polarne takie jak oleje roślinne, tłuszcze, estry lub  bardzo silne siarka, chlor i fosfor.

Emulsions / Water-soluble fluids

Penetrating liquids in the form of emulsions or soluble in water is a relatively high solution containing a large part of water. It’s so-called Liquids with a high water content. Liquids containing water-soluble oils form, after mixing with water, an emulsion. These oils are diluted before use and their concentration reaches up to 10%.

Synthetic or semi-synthetic fluids

Synthetic or semi-synthetic oils are usually made of synthetic polymers such as polyglycol, diesters, esters, silicone, chlorofluorocarbons and mixtures of water and synthetic fluid. Synthetic fluids are famous for their high resistance to fire and being very expensive.


High-pressure additives

The reason for adding high-pressure components is to improve wear resistance and improve the lubrication of metal surfaces. High-pressure additives contain chemically reacting ingredients such as phosphorus, sodium and chlorine. These components are chemically unstable. Accordingly, taking into account the surroundings, they react with the metal that is present to form a protective coating. It is a thin layer, formed of metal chlorides, sulphides or phosphides, which prevent sticking, thanks to the complete limitation of contact between metals.

Corrosion inhibitors

The reason for adding corrosion inhibitors is to eliminate or minimize corrosion. The best effect is when it occurs in a lower concentration. These additives usually stick to the surface as a result of electrostatic forces or attraction between surfaces and molecules.


The purpose of micro-sprinklers is to completely cover liquid and solid particles such as graphite, boron nitride, molybdenum disulfide or ptfe. In most cases, lubrication is provided by scattering, after evaporation of the carrier or solvent.

Choice of penetrating agent / penetrating grease

The choice of penetrating grease requires careful analysis of the product’s characteristics and specifications.

Flash point

The point of inflammation in the case of penetrating agents is the lowest temperature at which the liquid evaporates forming in the air an inflammable mixture right next to the surface of the liquid. Typically, the penetrating grease is volatile and has a very low flash point. Therefore, an inflammatory point is an important factor to pay attention to, especially when using this product near electronic components. Synthetic fluids have a higher flash point compared to straight oils.

Operating temperature

The operating temperature is the range in which the fluid works.

Dialectic strength

The dielectric strength of penetrating liquids represents the degree to which it repels the passing of an electric current before it disintegrates. Fluids with high dialectic strength are used in situations where the flow of electric current is high, eg telecommunications or power flow.


Water displacement

Penetrating lubricant characterized by displacement of water, allows to get rid of it from the surface. Liquids with lower surface energy relative to water will move under moisture or water on the surface on which they are used.

No foam / small foaming

The use of penetrating grease with these features allows the use of the preparation without the appearance of foam. Special ingredients are added to the liquid, giving it the same trait. Foaming can be extremely harmful when the agent is used as a coolant.


WD-40 Specialist Penetrant is an effective penetrating agent that contains elements specifically designed to loosen seized, rusty elements.


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