PFPE-Grease Noise Series

Today, Jialede will take you to deeply understand the "noble" in lubricating oil - perfluoropolyether grease.



Perfluoropolyether (PFPE, English name Perfluom Polyethers) was first studied in the 1960s and is a relatively special type of perfluoropolymer compound.

Its average molecular weight ranges from 500 to 15,000. There are only three elements, C, F, and O, in the molecule. It has the characteristics of heat resistance, oxidation resistance, radiation resistance, corrosion resistance, and non-flammability. It is used as an extremely reliable lubricant in cutting-edge fields such as military, aerospace, and nuclear industry. Today, perfluoropolyether is widely used in chemical, electronic, electrical, mechanical, nuclear, and aerospace fields.Because the fluorine atoms in perfluoropolyether have strong electronegativity, most of the carbon chain is shielded by fluorine atoms. Compared with hydrocarbon polyethers, it has the advantages of high density, low surface tension, low volatility, good viscosity, non-flammability, good dielectric properties, good lubricity, and is well compatible with plastics, rubber, and metals. It is a low molecular weight fluorinated polymer, and its viscosity is closely related to its molecular structure and average molecular weight. PFPE with a larger molecular weight has low volatility, a wider liquid temperature range and excellent viscosity-temperature characteristics.



Jialede perfluoropolyether grease has a stable molecular structure, and its high temperature resistance, fire resistance, radiation resistance and chemical resistance are also particularly excellent. It is suitable for lubricants under strong chemical conditions. However, the price of perfluoropolyether grease is relatively expensive due to its material.
Jialede has been focusing on the research and development of special lubricants and greases for 16 years.

Welcome to contact us for consultation and provide free sampling and testing.

Perfluoropolyether grease has excellent high temperature resistance, chemical corrosion resistance and wear resistance, and is often used in extreme environments (such as aerospace, semiconductor equipment, precision instruments, etc.). However, if it is found to be too viscous during use, it may affect the lubrication effect or equipment operation. The following is a detailed analysis and treatment method for its "too sticky" problem:


Analysis of the reasons for excessive viscosity
1. Improper selection of base oil viscosity: The viscosity of perfluoropolyether grease is determined by the viscosity of the base oil (perfluoropolyether). If the viscosity grade of the selected base oil is too high (such as ISO viscosity grade greater than 460), it will show obvious stickiness at room temperature.
2. Excessive thickener content: The content of thickener (such as polytetrafluoroethylene PTFE) in the grease is too high, which will increase the overall viscosity (such as NLGI grade exceeding No. 2), and thus appear more viscous.
3. The operating temperature is too low: The optimal operating temperature of perfluoropolyether grease is usually -20℃~260℃. If the ambient temperature is lower than its applicable lower limit, the fluidity of the base oil decreases, which will cause the grease to thicken.
4. Contamination or deterioration: After the grease comes into contact with water, dust or chemical media, the structure may change, resulting in an abnormal increase in viscosity.

Specific treatment methods
1. Adjust the use environment or increase the temperature under working conditions: If the viscosity is caused by low temperature, the grease can be restored to fluidity by preheating the equipment or increasing the ambient temperature. Reduce the load or speed: High-viscosity grease may increase friction under high-speed or heavy-load conditions. The operating intensity of the equipment can be temporarily reduced to observe whether the viscosity affects the performance.
2. Dilution treatment (caution required) Use special diluent: Perfluoropolyether grease needs to be diluted with fluorinated solvents, and avoid using ordinary organic solvents (such as ethanol, acetone) to prevent damage to the grease structure. Note: Dilution may shorten the lubrication life of the grease. It is only suitable for temporary adjustments, and it is recommended to operate under the guidance of professionals.
3. Replace the appropriate type of grease to reduce the viscosity of the base oil: choose a perfluoropolyether grease with a lower viscosity grade. Adjust the consistency grade: reduce the NLGI grade from No. 2 to No. 1 or No. 0, the consistency is softer and the fluidity is better. Consult the supplier: provide the equipment operating conditions (temperature, load, speed) and the existing grease model, and professionals will recommend the appropriate product.

Precautions
Avoid mixing: Mixing perfluoropolyether grease with other types of grease (such as lithium-based grease and silicone-based grease) may cause structural damage and aggravate the viscosity problem.
Safety protection: Wear gloves and protective tools during operation and operate in a well-ventilated environment.
Performance test: After any adjustment, the fluidity, lubrication effect and equipment operating temperature of the grease must be tested on a small range of equipment first, and then fully applied after confirming that there is no abnormality.

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In modern industrial testing, every test data point is crucial to product reliability and safety. When a 7005 bearing in a piece of bearing testing equipment worth $500,000 is required to operate continuously for hundreds of hours at ultra-high speeds of 15,000 rpm and temperatures of 350°C, conventional greases often struggle. Jialede's perfluoropolyether grease, specifically developed for these extreme conditions, is becoming a key guarantee for reliable operation of the testing equipment.

Bearing testing equipment places extremely stringent demands on lubricants. At 15,000 rpm, the 7005 bearing generates extremely high shear rates and centrifugal forces between the rolling elements and raceways. The operating temperature of 350°C far exceeds the tolerance of fluoropolymer grease. Hundreds of hours of continuous operation require the grease to possess exceptional durability and stability. Any lubrication failure can lead to skewed test data and even damage testing equipment worth hundreds of thousands of dollars. Developed specifically for extreme operating conditions, GF's perfluoropolyether grease utilizes a specially synthesized polyether base oil and a highly effective additive system, delivering exceptional performance:
1. Ultra-High-Temperature Stability: Its molecular structure ensures that the perfluoropolyether grease maintains lubrication even at temperatures up to 350°C without leaching or coking, ensuring long-lasting lubrication.
2. High-Speed Adaptability: Its excellent viscosity-temperature characteristics and shear stability form a stable oil film at high speeds, reducing bearing wear.
3. Long-Term Durability: Its exceptional resistance to oxidation and aging ensures effective protection even after hundreds of hours of continuous operation. Customer feedback from GF's full-service polyether grease: "Our $700,00 bearing testing equipment now produces more accurate and reliable data. The perfluoropolyether grease performs stably throughout the entire test cycle, fully meeting the testing requirements of 7005 bearings at 15,000 rpm and 350°C."

We understand that even small sample batches can be crucial to the success of critical testing. GF offers professional technical consultation and small-batch sample support. Please contact us to request samples. Our technical team is always available to provide product selection advice and application guidance.

At Jialede Fluorochemical Lubricants, we are always customer-oriented. On July 22, 2024, Mr. Li from an automotive parts manufacturing technology company inquired about the suitability of DuPont GPL-205K perfluoropolyether grease for automotive contact grease and conductive grease. We confirmed its suitability for automotive applications and recommended Jialede's Youbangshou brand, YBS-205 perfluoropolyether grease, offering stable performance at a price over 60% lower than international brands.

On August 8, Mr. Li explicitly requested an alternative to GPL-205 and provided detailed testing requirements, including: room temperature resistance comparison, 48-hour delamination test at 160°C, 144-hour resistance test under thermal cycling conditions of -40°C to 150°C, 144-hour mechanical endurance test, and verification of EGR valve minimum duty cycle and sensor voltage deviation at different temperatures. Engineer Li explained that the company specializes in EGR valves, with an annual production capacity exceeding one million units. The grease is primarily used for valve stems with a diameter of 4mm and a length of 40mm.

In response to this request, we promised to send a 50g sample of YBS-205 and the accompanying solvent, explaining that a 10%-20% performance degradation during thermal cycling testing would be considered unqualified. Engineer Li subsequently engaged in in-depth discussion regarding the impact of low-temperature mechanical motion on the grease, and we provided professional answers.


On September 8th, Engineer Li reported that the YBS-205 perfluoropolyether grease had successfully passed all tests and would enter the procurement process for a quantity of one million units. He emphasized the importance of ensuring quality during the order. We solemnly pledged that YBS-205 is a mature product, strictly adhering to the IATF 16949 quality management system. All batches undergo comprehensive testing before shipment to ensure they meet the high standards of the automotive industry. Galode will continue to provide high-performance perfluoropolyether grease solutions to the automotive industry to help the stable development of parts manufacturing.