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Impregnated graphite ring
Product Name: Impregnated Graphite Ring (for High-Performance Mechanical Seals) Abstract
The impregnated graphite ring is made of high-quality graphite matrix. Through advanced vacuum impregnation technology, it is filled with phenolic resin, epoxy resin or metal impregnating agents, significantly enhancing the mechanical strength, wear resistance and sealing performance of the material. This product has excellent self-lubrication, corrosion resistance and thermal stability, and can operate stably for a long time under extreme conditions. It is an ideal sealing material for industries such as petroleum, chemical engineering, and mechanical manufacturing. As a leading graphite material manufacturer in China, we have a complete quality management system and customization capabilities, and are committed to providing customers with high-performance and highly reliable impregnated graphite ring products.
Product Details
The impregnated graphite ring is produced by immersing the graphite matrix in a vacuum into phenolic resin, epoxy resin, furan resin, or molten metal such as antimony or lead, allowing the impregnating agent to fill the open pores of the graphite material. This process significantly improves the physical and mechanical properties of the material. This technique effectively enhances the density, strength, hardness, and corrosion resistance of the material, while maintaining the inherent self-lubrication and thermal conductivity of the graphite material.
The surface of the graphite ring after impregnation is smooth and dense, without any open pores, effectively preventing the leakage of the medium and ensuring excellent sealing performance. Depending on the type of impregnating agent, the product can adapt to various corrosive media such as acids, alkalis, and salts, as well as harsh working conditions such as high temperature and high pressure. We can provide customized services for products with different impregnating materials and performance indicators according to the specific needs of customers.
Product Parameters (Specifications)
Parameter Categories
Specific indicators
Explanation
Manufacturing process
Vacuum impregnation, heat treatment
Ensure that the impregnating agent fully penetrates the graphite matrix.
Material composition
Graphite matrix + Impregnating agent
The impregnating agents include phenolic resin, epoxy resin, antimony, etc.
Density
1.7 - 1.9 grams per cubic centimeter
The density significantly increased after impregnation.
Sho's Hardness
60 - 90
According to the ISO 3587:2019 standard
Flexural strength
≥ 30 MPa
The strength significantly increased after impregnation.
Compressive strength
≥ 60 MPa
Adapt to high-pressure conditions
Open air pore rate
≤ 0.5%
It is almost impermeable after impregnation.
Operating temperature range
-200℃ to 450℃
Depending on the type of the impregnating agent, there will be differences.
Thermal conductivity
100 - 200 W/m·K
Maintain the high thermal conductivity of the graphite material
Coefficient of friction
0.05 - 0.15
Excellent self-lubricating properties
Corrosion resistance
Resistant to acids, alkalis, salts and organic solvents
Select the appropriate medium based on the type of impregnating agent.
Material options:
Resin impregnation: Phenolic resin (excellent acid resistance), epoxy resin (good alkali resistance), furan resin (strong acid and alkali resistance)
Metal impregnation: Impregnation with antimony graphite (commonly used in high-temperature oil pump seals), impregnation with copper graphite (to enhance conductivity and heat conductivity)
Surface treatment:
Precision machining (surface roughness Ra ≤ 0.8 μm)
Polishing treatment (mirror finish, combined with high-precision sealing surface)
Coating treatment (according to specific operating conditions requirements)
Tolerance accuracy:
Dimension tolerance: ± 0.2 μm
Surface roughness: Minimum Ra 0.8 μm
End face parallelism: ≤ 0.02mm
Product Features and Applications
Core Features
The outstanding sealing performance and impregnation process almost completely seals the open pores of the graphite material, enabling the impregnated graphite ring to have a sealing capability with a nearly zero permeability. This effectively prevents the leakage of various media and ensures the reliable operation of the sealing system.
2. Significantly enhanced mechanical strength Compared to ordinary graphite materials, the flexural strength and compressive strength of the impregnated graphite rings have increased by more than 30%, and their wear resistance has improved by 2-3 times. They are more suitable for sealing conditions with high loads and high line speeds.
3. Excellent corrosion resistance: Depending on the choice of the impregnating agent, the product can withstand the corrosion of strong acids (such as sulfuric acid and hydrochloric acid), strong bases (such as sodium hydroxide), salt solutions, and various organic solvents, and is suitable for extremely corrosive environments.
4. The impregnated graphite ring has stable thermal properties. It maintains stable performance within the temperature range of -200℃ to 450℃, has a low thermal expansion coefficient, excellent heat shock resistance, and is suitable for high temperature difference working conditions.
5. Self-lubrication and low friction maintain the inherent self-lubricating properties of graphite materials, with a low friction coefficient and a small wear rate. Even in dry friction conditions without lubricants, they can operate normally.
Application fields
Application of Mechanical Seals
High-speed centrifugal pump, compressor shaft seal
High-temperature oil pump, chemical pump mechanical seal
Mixing equipment and reaction vessel equipment sealing
Valve and flange sealing system
Petroleum and Chemical Industry
Sealing of crude oil transfer pump
Sealing of high-temperature and high-pressure facilities in the refining and chemical plants
Chemical reactor sealing
Sealing of the tube sheet of the heat exchanger
Electricity industry
Boiler feed pump seal
Steam turbine shaft sealing system
Sealing of the desulfurization device
Sealing of the energy storage system
Aerospace and Aviation
Sealing of the aircraft engine fuel system
Hydraulic system seal
Environmental control system sealing
Marine Engineering and Ships
Ship shaft sealing system
Sealing of underwater equipment on offshore platforms
Deep-sea submersible sealing device
Food and Medicine
Food processing equipment sealing
Pharmaceutical machinery seal
Bioreactor sealing
List of Core Advantages
Sealing reliability: The impregnation process ensures zero leakage, with excellent sealing performance and a leakage rate far lower than industry standards.
High mechanical strength: Flexural strength ≥ 30 MPa, Compressive strength ≥ 60 MPa, Wear resistance increased by 2-3 times
High corrosion resistance: Capable of withstanding strong acids, strong bases, salt solutions and organic solvents. The applicable medium range is wide.
Good temperature adaptability: The operating temperature range is -200℃ to 450℃, with excellent resistance to thermal shock.
Self-lubricating performance: The friction coefficient is low (0.05 - 0.15), and no external lubrication is required.
Long service life: Under harsh conditions, its service life is 3 to 5 times longer than that of ordinary graphite rings.
Customized service: Different impregnation materials, sizes and performance indicators can be customized according to customer requirements.
Quality Assurance: Certified to ISO9001:2015 quality system standard. The product complies with JB/T 8872 standards.
Environmental compliance: Compliant with environmental standards such as RoHS and REACH, capable of meeting export requirements
High cost-effectiveness: Compared to materials such as hard alloys and ceramics, the cost is reduced by more than 30%
Technical Capability Details
Impregnation Process Technology
We employ advanced vacuum impregnation technology and ensure product quality through the following steps:
Matrix pre-treatment
The graphite matrix was machined to the required dimensions.
Ultrasonic cleaning for oil removal and impurity removal
Heat treatment removes moisture and volatile substances.
2. Vacuum impregnation
Place the graphite substrate in the vacuum impregnation equipment.
Vacuum the system to below 0.1 Pa, and remove the gas from the pores of the substrate.
Injecting the liquid impregnating agent under vacuum conditions
Maintain vacuum impregnation for 30 to 60 minutes to ensure that the impregnating agent is fully absorbed.
3. Solidification treatment
Resin impregnation: Cured according to a specific temperature curve to ensure complete polymerization of the resin.
Metal impregnation: Cooling and curing, metal filling the pores
4. Post-processing
Precision machining to the final size
Surface polishing treatment (as per customer requirements)
Quality inspection and performance testing
Material selection expertise
Phenolic resin impregnation
Excellent acid resistance, suitable for strong acid media
The cost is relatively low and the value for money is high.
The operating temperature can reach up to 200℃.
Moderate hardness, good machinability
Epoxy resin impregnation
Excellent alkali resistance and solvent resistance
Higher mechanical strength and greater wear resistance
The operating temperature can reach up to 250℃.
Strong adhesive force and stable structure
Furan resin impregnation
Best comprehensive resistance to acid and alkali conditions
High resistance to chemical medium corrosion
The operating temperature can reach up to 300℃.
Suitable for complex chemical environments
Metal impregnation (with antimony, copper, etc.)
The conductivity and heat conductivity have been significantly enhanced.
The wear resistance has been further enhanced.
Suitable for special working conditions requirements
Different metals can be selected as needed.
Quality control system
We have established a comprehensive quality management system to ensure the consistency and reliability of our products:
1. Raw material control
Purchase of high-quality graphite matrix
Qualification review of emulsifier suppliers
Inspection of raw materials upon entry to the factory
2. Process Control
Real-time monitoring of impregnation process parameters
Precise control of the curing curve
Monitoring of environmental conditions (temperature, humidity, cleanliness)
3. Product Inspection
Density test (Archimedes method)
Hardness test (Shore hardness tester)
Strength test (universal material testing machine)
Porosity test (helium leak detection)
Corrosion resistance test (medium immersion)
Dimension accuracy inspection (three-coordinate measuring instrument)
4. Quality Traceability
Product Batch Management
Full-process quality record
Non-conforming Product Control Procedure
Continuous improvement mechanism
Research and development innovation capability
We have a professional materials research and development team, which continuously drives product innovation:
Development of New Impregnating Agents
Process optimization and improvement
Performance testing and evaluation
Application Technology Research
Patent technology transformation
Application domain presentation
Petrochemical industry
In the petrochemical industry, impregnated graphite rings are widely used in sealing systems under various harsh conditions, including:
Crude oil transportation system
High-pressure crude oil pump shaft seal
Valve sealing
Pipe flange sealing
Refining and Chemical Plant
Sealing of the high-temperature distillation tower
Reactor seal
Sealing of the heat exchanger
Pump and compressor seals
Chemical medium transportation
Sealing of strong acid and strong alkali pumps
Sealing of the solvent delivery system
Sealing of corrosive media
Mechanical manufacturing industry
In the field of mechanical manufacturing, impregnated graphite rings, due to their excellent wear resistance and self-lubrication properties, have become the preferred material for sealing in various mechanical equipment:
General Machinery
Centrifugal pump seal
Reciprocating pump seal
Compressor seal
Blender seal
High-precision equipment
Precision machine tool spindle seal
High-speed motor shaft seal
Precision instrument sealing
Construction machinery
Sealing of the hydraulic system of the excavator
Sealing of the loader's transmission system
Engineering pump seal
Electricity industry
In the power industry, impregnated graphite rings are used in various sealing applications that require high temperature resistance and corrosion resistance:
Thermal power industry
Boiler feed pump seal
Sealing of the induced draft fan and the supply fan
Coal mill seal
Sealing of the desulfurization device
New Energy
Wind power generation gear box seal
Thermal insulation of photovoltaic inverter
Energy storage system sealing
Hydrogen energy equipment sealing
Aerospace and Aviation
In the aerospace field, impregnated graphite rings are used in sealing systems with extremely high reliability requirements:
Aircraft
Sealing of the aircraft engine fuel system
Hydraulic system seal
Environmental control system sealing
Landing gear seal
Spacecraft
Rocket engine seal
Spacecraft propulsion system seal
Life support system sealed
Sealing of the experimental module
Ocean Engineering
In the field of marine engineering, impregnated graphite rings are used in various sealing systems in underwater and marine environments:
Ship
Ship shaft sealing system
Ship pump seal
Valve sealing
Cabin sealing
Offshore platform
Platform underwater equipment sealing
Sealing of the seawater desalination system
Sealing of oil and gas extraction equipment
Sealed deep-sea exploration equipment
Frequently Asked Questions Answered
Q1: What are the main advantages of impregnated graphite rings compared to ordinary graphite rings?
A1: The impregnated graphite ring has the following significant advantages over the ordinary graphite ring:
Better sealing performance: The impregnation process almost completely seals the open pores, preventing the penetration of the medium.
Higher mechanical strength: The flexural strength and compressive strength have increased by more than 30%
Better wear resistance: The wear resistance has been enhanced by 2-3 times, resulting in an extended service life.
More corrosion-resistant: Capable of withstanding a wider range of corrosive media
Surface is smoother: The surface roughness after processing can reach below Ra 0.8 μm.
Q2: How to select the appropriate type of impregnating agent?
A2: When choosing the impregnating agent, specific application conditions should be taken into account:
Phenolic resin impregnation: Suitable for strong acid media, with low cost and high cost-effectiveness.
Epoxy resin impregnation: Suitable for strong alkalis and organic solvents, with higher mechanical strength
Furan resin impregnation: Suitable for complex chemical environments with extremely high requirements for resistance to acids and alkalis.
Metal impregnation: Suitable for applications requiring electrical conductivity, heat conductivity, or exceptional wear resistance.
If you are not sure, our technical team can provide you with professional selection suggestions.
Q3: What is the temperature range for using the impregnated graphite ring?
A3: The operating temperature range depends on the type of impregnating agent:
Resin impregnation: -50℃ to 200℃ (phenolic), -50℃ to 250℃ (epoxy)
Furan resin impregnation: -100℃ to 300℃
Metal impregnation: Up to 450℃
For special high-temperature applications, please contact us for customization.
Q4: How to correctly install the impregnated graphite ring?
A4: When installing the impregnated graphite ring, please pay attention to the following points:
The sealing surface should be clean and flat, without any scratches, dents or other defects.
It is recommended to use a dedicated installation tool to avoid damaging the device by knocking.
The installation pressure should be uniform and avoid being too tight in any one area.
Hot application should consider leaving a thermal expansion gap.
For dry friction conditions, it is recommended to conduct a warm-up run first.
Detailed installation instructions can be found in our technical manual or you can contact the technical support for assistance.
Q5: What are the quality standards and certification status of the product?
A5: Our impregnated graphite rings strictly adhere to the following quality standards:
Compliant with JB/T 8872 'Technical Specifications for Carbon Graphite Sealing Rings for Mechanical Seals'
Compliant with ISO 3587:2019 'Graphite Self-Sealing Rings' standard
Passed the ISO9001:2015 quality management system certification
The product complies with environmental protection requirements such as RoHS and REACH.
Material reports (MTR), material certifications (MC) and quality certificates can be provided.
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SIMO (TIANJIN) TECHNOLOGY CO., LTD.
Telephone: 136-4212-5292
Q Q:2767728703
Postal Code: 300350
Email: smkj889@163.com
思摩（天津)科技有限公司
电话:13642125292
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Q Q:2767728703
邮编:300350
邮箱:smkj889@163.com
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