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Dry film lubricants are coating materials in which solid lubricant particles are dispersed within a binder system. After application, they can cure at room temperature or under heat, forming a solid lubricating film with specific functional properties. These products combine the advantages of lubrication technology and surface engineering, making them an essential part of modern high-performance lubrication materials, and they are widely used across various industrial sectors.
To ensure that dry film lubricants deliver optimal performance, proper surface preparation and application procedures are crucial. The specific steps are as follows:
Before coating, it is essential to thoroughly remove oils, dust, and oxides from the substrate surface. Inadequate cleaning will directly affect the adhesion strength and service life of the coating.
The substrate should undergo chemical conversion (e.g., phosphating, passivation) or physical treatment (e.g., sandblasting, roughening) to significantly enhance the bonding between the film and substrate. This step is indispensable in the application process.
After surface pretreatment, any residues must be removed, and the substrate must be completely dry to prevent moisture or contaminants from compromising the coating quality.
Depending on the operating conditions and functional requirements of the components, an appropriate application method—brushing, spraying, or dipping—should be selected. The coating is then cured under the recommended conditions, forming a uniform and stable dry lubricating film.
Dry film lubricants are suitable for a wide range of materials, including metals, plastics, and rubber, and perform exceptionally well in situations where conventional lubricants are insufficient. They can be used in combination with conventional lubricants for synergistic effects or applied alone as a permanent or corrosion-resistant lubrication solution.
Their applications span office equipment, household appliances, automotive manufacturing, and general machinery, and extend to high-tech sectors such as aerospace. They are suitable for trial assembly, friction control, corrosion protection, and long-term lubrication requirements.
High-temperature environment: Under high-speed and heavy-load operating conditions, gear components often experience elevated temperatures, with local temperatures reaching 200–300°C. If the grease lacks sufficient high-temperature resistance, its base oil and thickener are prone to thermal oxidation, resulting in a decline in lubrication performance.
Influence of chemical contaminants: Prolonged exposure of grease to air, or contact with industrial gases containing sulfur, nitrogen oxides, and other contaminants, can accelerate the oxidation process, leading to structural degradation and an increase in acid value.
Choose grease products with excellent antioxidant properties and thermal stability, especially under high-temperature and heavy-load conditions. Pay attention to their oxidation induction period and corrosion resistance.
Maintain proper sealing of the gear system to prevent ingress of water, dust, and other contaminants. Regularly clean the equipment and inspect the condition of lubricated parts.
By improving heat dissipation conditions or adding cooling devices, the gear system temperature can be maintained within a reasonable range, helping to extend the service life of the grease.
Develop a grease replacement cycle based on equipment usage, and monitor the grease oxidation status through oil analysis techniques to implement preventive maintenance.
Proper grease selection is key to ensuring the long-term stable operation of gears. It is recommended not to choose ordinary grease based solely on price, but to focus on technical compatibility and product reliability. Prioritize suppliers with comprehensive R&D capabilities and proper certifications to ensure optimal lubrication performance and equipment longevity.
Shenzhen Eubo has been dedicated to the lubricant materials field for 23 years, focusing on the research and production of bearing greases, high-temperature greases, and other specialty lubricants, with extensive technical expertise and practical experience. We welcome inquiries and cooperation from customers with relevant needs.
The smooth and controlled opening and closing of a toilet seat is attributed to the sophisticated design between the damping shaft and the shaft sleeve. When the seat is lifted, motion is transmitted through the bearing, allowing the shaft and sleeve to rotate together. During this phase, the damping mechanism remains inactive, ensuring the cover can be raised effortlessly.
When the seat begins to descend, the intricate directional locking mechanism engages, causing the shaft and sleeve to disengage and the shaft to form a reverse lock with the sleeve base. Through the combined action of the damping mechanism and the damping grease, the toilet seat closes slowly and uniformly, achieving a smooth and steady descent.
Damping Grease
Damping grease is a specialty lubricant formulated from high-viscosity synthetic oil, specifically designed for mechanisms requiring cushioning, such as toilet seat hinges. It operates reliably over a wide temperature range of -30°C to 150°C and is safe, non-toxic, non-corrosive, and low in volatility.
More importantly, it provides excellent anti-wear lubrication and outstanding damping performance, effectively slowing the descent of the toilet seat during closure. This prevents harsh collisions between the seat and the toilet bowl, eliminates noise, reduces potential damage, and enhances the overall user experience. It also finds broader applications in other mechanisms requiring controlled cushioning.
In addition to its use in toilet seat slow-close systems, damping grease is also widely applicable to various mechanisms requiring cushioning and noise reduction, such as door and window hinges, furniture hinges, and rotating shafts. Whether applied to metal or plastic hinges, it provides long-lasting protection and ensures smooth operation, significantly enhancing the durability of the product and the overall user experience.
Damping grease is a functional grease made from specially selected polymers, specialty additives, and thickeners through a unique manufacturing process. It features excellent adhesion, high viscosity, superior lubrication performance, chemical stability, and mechanical stability. It is particularly suitable for positions between plastics and metals that require long-term damping (buffering, resistance) and lubrication.
Typical application areas of damping grease include:
Sealing and leak-prevention parts: Such as sealing valves in water or fuel gates, used for lubrication and leak-proof filling.
Precision instruments: Parts that require damping and buffering.
Household products: Items that need cushioning or a naturally comfortable tactile feel.
Hardware and power tools: High-end door hinges, faucets, power tools, and movable joints in plastic toys.
Office equipment and mechanical structures: Internal plastic or metal moving parts in office equipment, toys, gearboxes, etc., requiring lubrication, noise reduction, shock absorption, or resistance functions.
Special application case: High-end door hinges.
Low-Temperature Damping Grease is specially designed for precision mechanisms operating under high and low temperature conditions (-20℃ to 80℃). Its core advantage lies in maintaining stable torque across a wide temperature range, ensuring effective damping and shock absorption for precision positioning mechanisms, fine-tuning devices, and stiction/ buffering components. This allows moving parts to operate smoothly, gently, and accurately.
Typical Applications Include:
Damping and anti-slip mechanisms for lens focusing in cameras, microscopes, telescopes, and rangefinders
Turntable damping gears and switch devices in disc players
Other precision mechanical components requiring stable damping performance at low temperatures
To ensure optimal performance and safe use, please strictly follow these precautions:
Clean and Dry: Before application, ensure that the area to be greased is completely dry, clean, and free of contamination.
Prevent Contamination: During use and storage, strictly prevent dust and foreign particles from mixing in. Always tightly seal the container after use.
No Mixing: Do not mix with other types of greases, as this may cause adverse reactions, reduce performance, or damage components.
Plastic Compatibility: For special plastic parts, conduct a compatibility test or obtain explicit approval from the plastic manufacturer before use to avoid swelling, embrittlement, or other adverse effects.
Proper Storage: Store the product in a clean, dry, cool, and dark place.
1. Anti-Wear Performance Test (SH/T 0204)
Using a specialized anti-wear testing device, under a specified load, the upper steel ball rotates relative to three stationary steel balls on the lower surface, which are coated with the grease sample. After the test, the wear scar diameters on the three lower steel balls are measured. The size of the wear scars is used to evaluate the anti-wear performance of the grease.
2. Four-Ball Test Method (GB/T 3142)
In the four-ball test, grease is applied to a ball cup, and under a specified load, the upper bearing steel ball rotates at a set speed against three stationary steel balls below. After a period of operation, the wear scar diameters are measured to evaluate the extreme pressure (EP) performance of the grease.
There are three common expressions for this method: PB value, PD value, and ZMZ value:
PB value: The maximum load under which no seizure occurs during the test, expressed in Newtons (N).
PD value: The minimum load at which the rotating ball and the three fixed balls weld under the test conditions, expressed in N.
ZMZ value: An indicator of the grease’s resistance to extreme pressure under applied loads. During the test, the load is incrementally applied to the three stationary balls in 0.1 logarithmic units, and the first ten seizure load results are used to calculate the ZMZ value, expressed in N.
3. Timken Test
This test is performed using a Timken test machine. Grease is applied between the friction surfaces of a metal ring and steel block under a specified load and speed. After a period of operation, the wear marks on the metal balls are examined to determine the EP performance of the grease, represented by the OK value.
Purpose: To analyze the grease’s ability to resist loads under line contact.
Test Method: SH/T 0203
4. Four-Ball Extreme Pressure Test (GB/T 12583)
This method is also expressed using three indicators: PB value, PD value, and LWI value.
LWI value: Indicates the extreme pressure capacity of a sealed grease under a limiting load. It is determined by applying incremental loads in 0.1 logarithmic units on the three stationary balls and performing ten tests before the seizure point. The average corrected load represents the LWI value.
