Solid Lubricants

Please take a look at our solid lubricants Tungsten Disulfide, Molybdenum Disulfide and Hexagonal Boron Nitride.

Hexagonal Boron Nitride (hBN) has a very good thermal conductivity, good electric insulation, and also a good thermal shock resistance. These properties make it suitable for use in ceramic materials, coming from - for example - a hot pressing process. The material withstands temperatures of up to 2,000°C in non-oxidizing atmospheres and up to approximately 750°C in oxidizing atmospheres. Hexagonal Boron Nitride is not wetted by most molten metals; this is of advantage for some refractory materials in casting processes.

Moreover, Hexagonal Boron Nitride has a low coefficient of friction, so that it is part of some lubricant compositions; it is also called “white graphite” because of a similar crystalline structure.

We offer both Natural as well as Synthetic Graphites.

Natural Graphites are available in flake and needle form. The minimum carbon content can be fixed anywhere between 75% and 99.5%.  

Thermal conductivity: 8-17 W/mK (at 20°C)
Density:  2.1-2.3 g/cm³

Many different particle size distributions are available.

Synthetic Graphites are made from new pure electrodes with an extremely low SiO₂ level and a sulfur content of less than 0.05%. 
The carbon content can be fixed either at min. 98% or min. 99%.

Thermal conductivity: 40-130 W/mK (at 20°C)
Density:  2.1-2.3 g/cm³

Many different particle size distributions are available, but the most common grades of Synthetic Graphite are:

• Grade A:  100%  < 0.5 mm
• Grade B:  100%  < 2.0 mm

Both Natural as well as Synthetic Graphites are mainly used for their lubricity, e.g. in: friction materials, solid lubricants, carbon brushes, pencils, crucibles, chemical insulation, electrodes.

► Technology
HS Grade Grease is based on synthetic base oil with Polyurea Technology. The Polyurea Technology limits breakdown at high shear conditions, providing the required sealing performance, maintaining viscosity at wider range of operations. HS Grade Grease has stability control ingredients, so high mechanical shearing and temperature fluctuations only marginally affect the stability, providing consistency across operating conditions. Good sealing is ensured as the product resists softening even in high vibration environments.

► Ingredients
The synthetic oil base provides improved evaporation resistance and higher operating temperature than lithium, calcium, and lithium-complex based grease products. The formulation has ingredients such as synthetic base oil, polyurea thickener, structure improvers, EP and Anti-Wear agents, Antioxidants, a High Temperature Oxidation Inhibitor and a Tackifier.

► Applications
HS Grade Grease is ideal for usage in High-Speed Gears, Bearings, Chains and other transmission components, ensuring long service life. The lower viscosity synthetic oil base improves the high temperature and high-speed stability.

Examples: Angle Grinders, Grinding Machines, Power Tools with High-Speed Gears

► Usage Notes
This product is NOT suited for Plastic, Rubber and other potentially incompatible seal materials and environments without prior careful testing and evaluation. Same is applicable for Copper Worm Gears. The exact temperature range would be defined by testing and is dependent on the lubricating pair of materials, their sealing properties, and other working conditions. Primary factors that impact life of the grease are load, speed and temperature, the secondary factors are dirt, humidity, and air flow. The life of the grease is significantly improved when used under favorable conditions, and drastically reduced in less favorable conditions.

If operation temperature exceeds the suggested range for short durations, the interval required for “relubrication” should be reduced to prevent breakdown of the grease structure. Ideal design of products should allow for complete purging of the package before re-lubrication; unless the standard protocol followed is dismantling, complete replacement and recharge of the grease package, and re-assembly of the housing.

The recommended temperature range of operation is -35 to +190 °C.

► Technology
HT Grade Grease is based on semi-synthetic base oil with Lithium Complex Technology. Lithium Complex Technology is superior to regular lithium and calcium-based greases as these products have lower temperature of melt, above which the grease structure is destroyed. Using the Lithium Complex Technology extends the usage temperature and life well above other competing technologies.

► Ingredients
The base is a mix of solvent-refined mineral oil and synthetic oil, providing improved evaporation resistance. The formulation has additional ingredients such as structure improvers, EP and Anti-Wear agents, Antioxidants, and a High Temperature Oxidation Inhibitor. The composition is aimed to expand the application range beyond regular lithium grease products.

► Applications
HT Grade Grease is ideal for usage in Bearings and Gear Lubrication, providing long service life. Heavy Load Bearing applications benefit from the EP and Anti-Wear ingredients.

Examples: Electric Drills, Impact Wrenches, Power Tools with Planetary Gears

► Usage Notes
This product is not suited for Plastic, Rubber and other potentially incompatible seal materials and environments without prior careful testing and evaluation. Same is applicable for Copper Worm Gears. The exact temperature range would be defined by testing and is dependent on the lubricating pair of materials, their sealing properties, and other working conditions. Primary factors that impact life of the grease are load, speed and temperature, the secondary factors are dirt, humidity, and air flow. The life of the grease is significantly improved when used under favorable conditions, and drastically reduced in less favorable conditions.

If operation temperature exceeds the suggested range for short durations, the interval required for “relubrication” should be reduced to prevent breakdown of the grease structure. Ideal design of products should allow for complete purging of the package before re-lubrication; unless the standard protocol followed is dismantling, complete replacement and recharge of the grease package, and re-assembly of the housing.

The recommended temperature range of operation is -20 to +180 °C.

ALROKO supplies HT EP Grease, which features Tungsten Disulphide particles along with other specialty additives formulated into a Synthetic High Viscosity Base Oil (Poly Alpha Olefin or PAO).

These grades of ALROKO HT EP Grease can exceed the challenging performances required in the temperature range from -20°C up to about 800°C.

Be it High Load, High Pressure, High Temperature performance or a combination of these factors, ALROKO HT EP Grease is the best technical option you can choose.

► Ultimate dry lubricant – WS₂
The main dry lubricant ingredient in the grease is WS₂, known to be one of the highest temperature stable layer structured lubricants. Compared to other common dry lubricants including PTFE and MoS₂, Tungsten Disulphide offers higher temperature stability, and hence long-lasting performance.

► Lowest CoF (Coefficient of Friction)
Tungsten Disulphide provides the lowest coefficient of friction in normal and high temperature application conditions. Low CoF means less wear on moving components, longer life, and more peace of mind.

► Extreme Pressure performance
Our HT EP Grease has been tested in multiple high pressure scenarios. Compared to other lubricant formulations, our HT EP Grease shows superior performance, even under 300,000 psi pressure conditions. Such performance cannot be matched with MoS₂ based grease products.

► Withstanding High Shear
Formulated with best available dry lubricants, ALROKO HT EP Grease is mechanically stable even under high shear loads. This means that the material will not break down, disintegrate, or be destroyed under demanding conditions. Whether in high shear bearings or high-speed motors, ALROKO HT EP Grease ensures that the moving surfaces remain protected.

► High Dropping Point
In internal tests, the Dropping Point was measured to be above 320°C. This ensures a highly stable formulation that provides Long Service Life under High Pressure Load Bearing applications.

► Versatile
ALROKO HT EP Grease is specifically formulated for humid, and rusty environments. The specialty additives are chosen to withstand moisture, dust and other environments encountered in multiple products and applications. Engineered to providing stable and effective lubrication under numerous adverse working conditions.

► Markets and Industries
ALROKO HT EP Grease is recommended for high temperature and high-pressure applications which can also see potentially oxidizing and humid environments. Industries for potential use include Aerospace, Automotive, Appliances, Chemicals, Heavy Machinery, Industrial Machines, Metallurgical Operations, Mining, Power Industry, Ship Building, as well as Steel Plants.

► Two Grades available
ALROKO HT EP Grease is available in two variants, one is the Standard, and the other is the FSO grade. FSO stands for Fully Synthetic Oil. While the Standard grade works well for most demanding applications, the FSO grade is preferred by discerning customers for targeted specialty applications.

Molybdenum Disulfide is a well established solid lubricant for the use in different lubricant compositions to lower the friction and mechanical wear. We offer purities from 96%-99%, most commonly used is 98.5%. There are three standard particle size ranges between 1 and 30 µm.

This grey powder can be used for innovative and demanding solid lubricant materials for equipment which is difficult to maintain . 

Due to the layered structure and the high reactive specific surface area, Nano Molybdenum Disulfide (MoS₂) is excellent for friction materials for space vehicles, satellites and military vehicles but also as catalyst and for composite applications.  

Nano Tungsten Disulfide (WS₂) can be used for solid lubricant materials; not only for general lubrication, but it can also be used in work environments of high temperature, high pressure, high vacuum, high load, with radiation and/or corrosive media.

This extremely fine powder (<100 nm) has a purity of min. 99%. It can also be added to speciality oils in order to improve their lubricity. 

We offer synthetic as well as natural grades of Pyrite (Iron Disulfide) in different particle size distributions. The sulfur level of the synthetic grades is in the 50-55% range. 

Pyrite is mainly used for the production of sulfur dioxide and therefore subsequently used in the production of sulfuric acid and in the paper industry. In the friction materials industry, it can be used as a lubricant with high economical benefits in comparison to other metal sulfides.

Tungsten Disulfide is a high performance solid lubricant with superior chemical and physical properties; it is one of the most lubricious materials known in science. 

Additionally, Tungsten Disulfide is very stable at high temperatures and under high pressure; it offers temperature resistance from approx. -270°C to 650°C in normal atmosphere and from approx. -188°C to 1,316°C in vacuum. Tungsten Disulfide is an additive in various high performance lubricants such as greases, oils or lubricant varnishes. It is also used in high performance friction materials.

We can supply Tungsten Disulfide grades with different particle size distributions including nano.