Hengshui Minai Rubber & Plastic Technology Co., Ltd. is one of the leading manufacturers and suppliers of graphite seal ring in China. We are committed to providing high quality customized service and OEM/ODM service to global clients. Please feel free to wholesale bulk durable graphite seal ring made in China here from our factory. If you have any enquiry about pricelist, please feel free to email us.
Products Description
This series of graphite seal rings is made of high-purity expanded graphite with purity ≥98%, asbestos-free and impurity-free. Finely processed through multi-layer lamination, high-temperature shaping and precise trimming, the products have compact and uniform structure, smooth surface, excellent elastic resilience, regular dimensions and high sealing fitting degree, which can closely fill micro gaps of equipment to achieve zero-leakage sealing after installation. Graphite material has inherent natural self-lubricating performance with an ultra-low friction coefficient, requiring no additional lubrication during equipment rotation and reciprocating movement, avoiding shaft scratching and wear powder generation. It features extremely high chemical stability, resisting strong acid, strong alkali, organic solvents, steam and heat conduction oil corrosion without reacting with most industrial media. With an ultra-low thermal expansion coefficient, it maintains stable dimensions under temperature changes, no softening or hardening at high temperature and no brittle cracking at low temperature. It can withstand long-term alternating high and low temperature, high-pressure impact and continuous operation, perfectly solving the pain points of conventional seals such as high-temperature failure, corrosion leakage and dry wear damage, suitable for various static and dynamic sealing scenarios.
Product Advantages
Ultra-high Temperature Resistance & Extreme Environment Stability
Graphite boasts outstanding high temperature resistance. It can withstand long-term high temperature of 450℃ in aerobic environments and instantaneous extreme temperature of 650℃ in anaerobic environments, and adapt to ultra-low temperature of -200℃. It maintains stable performance without melting, carbonization, shaft clamping or deformation failure, serving as an irreplaceable sealing material for high-temperature industrial equipment.
Self-lubrication & Low Friction for Durability
With excellent solid self-lubricating properties, it has minimal friction resistance under dry friction conditions, ensuring smooth shaft operation without jamming and no additional lubrication required. It resists wear and shaft damage during long-term high-speed rotation and reciprocating movement, greatly reducing equipment operation loss and maintenance costs with a far longer service life than rubber and plastic seals.
Corrosion & Chemical Resistance for Complex Media
Featuring strong chemical inertness, it is insoluble in various industrial media such as acid, alkali, grease, steam and solvents. It resists strong acid and alkali corrosion, high-temperature steam scouring and chemical solvent immersion, without swelling, aging or damage during long-term operation, maintaining stable sealing performance consistently.
Excellent Resilience & Zero-leakage Sealing
Zero-leakage Sealing: Flexible graphite has excellent elasticity with tight fitting under pressure and fast resilience recovery. It adapts to tiny equipment vibration and pressure fluctuations, effectively filling irregular micro gaps to eliminate micro-leakage of steam, liquid and gas, delivering high sealing accuracy and superior air tightness.
Asbestos-free & Environmentally Friendly
Adopting pure asbestos-free graphite formula, it contains no harmful impurities and dust pollution, being environmentally friendly and compliant with industrial environmental standards, suitable for high-standard and strict industrial scenarios such as thermal power, nuclear power and chemical industry.
Product Parameters
|
Parameter |
Specification |
|
Material |
High-purity Flexible Expanded Graphite (Purity≥98%, Asbestos-free) |
|
Density |
1.4~1.7g/cm³ |
|
Working Temperature |
-200℃ ~ 450℃ (Long-term aerobic); Max 650℃ (Short-term anaerobic) |
|
Working Pressure |
0–10MPa High-pressure sealing |
|
Core Features |
High temperature resistance, self-lubrication, acid & alkali resistance, corrosion resistance, low friction, no hardening |
|
Applicable Medium |
High-temperature steam, heat conduction oil, acid & alkali solution, lubricating oil, gas, organic solvent |
|
Execution Standard |
JB/T 6617 Industrial Sealing Standard |
|
Applicable Conditions |
High-temperature static & dynamic sealing, dry friction without lubrication, corrosive extreme working conditions |
Product Q&A
Q: What are the advantages of graphite seal rings over rubber seals?
A: The core advantages are high temperature resistance, corrosion resistance and dry friction adaptability. Rubber seals can only withstand up to about 180℃, prone to aging, hardening and leakage at high temperatures, and cannot adapt to strong corrosive media and dry friction conditions. In contrast, graphite seal rings can resist long-term high temperature up to 450℃, acid and alkali corrosion, and feature self-lubrication. They work stably in extreme scenarios such as oil-free dry friction, high-temperature steam and chemical corrosion where rubber seals fail completely, serving as exclusive sealing parts for high-temperature and corrosive equipment.
Q: Will graphite seal rings carbonize, harden or fail at high temperatures?
A: No. High-purity flexible graphite itself is a high-temperature stable material without carbonization, melting or hardening at high temperatures, maintaining flexible resilience throughout operation. It will not cause shaft jamming, sealing failure, cracking or residue falling under rated high-temperature conditions, and retains original elasticity and sealing performance after temperature drops, with far higher high-temperature stability than all rubber and plastic seals.
Q: Do graphite seal rings need lubricant assistance?
A: No. Graphite has excellent solid self-lubricating performance and is one of the few sealing materials supporting oil-free dry friction operation. It maintains low friction and low wear without shaft scratching during high-speed rotation and reciprocating movement without lubricant filling, especially suitable for clean industrial scenarios where oil pollution is prohibited or lubrication is unavailable due to high-temperature volatilization.
