Flexible Graphite Ring Sealing Die-Formed Ring for Industrial Machinery

• Material: Graphite
• Application: Valve
• Type: Static Seal
• Model NO.: Flexible Graphite Ring
• Performance: High Pressure
• Shape: O-Ring
• Standard: Standard, Nonstandard
• Customization: Available
• Density: 1.0-1.3 G/Cm³
• Recovery: ≥ 15%
• Compatible Media: Water, Steam, Oils, Solvents, Acids/Alkalis
• Transport Package: Wooden Boxes
• Specification: as your requirement
• Trademark: CHUNHUAN
• Origin: China
• Production Capacity: 100000pieces/Month
• Package Size: 10.00cm * 10.00cm * 10.00cm
• Package Gross Weight: 1.000kg

Product Description

Product Description

Flexible Graphite Ring

Flexible graphite rings are typically made from high-purity flexible graphite tapes or braided flexible graphite fillers. This flexible graphite material possesses high flexibility and malleability, allowing it to adapt to various shapes and sizes. Through special processing techniques, flexible graphite material can be formed into ring-shaped seals to meet the sealing requirements of various pipelines, equipment interfaces, or valves.
 

 

High-Temperature Resistance: Flexible graphite rings exhibit outstanding resistance to high temperatures and can operate under extreme temperature conditions, typically ranging from below several hundred degrees Celsius to several hundred degrees Celsius.

High-Pressure Resistance: Due to their dense structure and excellent elasticity, flexible graphite rings can withstand high-pressure environments without compromising their sealing performance, typically capable of withstanding tens to hundreds of megapascals of pressure.

Chemical Stability: Flexible graphite material demonstrates good chemical stability and can withstand the corrosion and erosion of various chemical media, including acids, alkalis, solvents, etc., making it suitable for various industrial environments.

Flexible Sealing: Flexible graphite rings possess good flexibility and elasticity, allowing them to adapt to minor deformations and vibrations during equipment operation, thereby achieving reliable sealing.
 

Material	Flexible graphite
Density	1.0 - 1.3 g/cm³
Compressibility	25 - 35%
Compatible Media	Water, steam, oils, solvents, acids/alkalis

 

Flexible graphite rings are widely used in various industries, including but not limited to:

• >>Chemical Industry: Sealing for chemical equipment, reactors, pipeline connections, etc.
• >>Oil and Gas Industry: Sealing for pipelines, valves, pumps, etc.
• >>Energy Sector: Sealing for heat exchangers, boilers, etc.
• >>Pharmaceutical and Food Processing: Sealing for pharmaceutical production equipment, food processing equipment, etc.
• >>Aerospace and Automotive Manufacturing: Sealing for engines, hydraulic systems, etc.

Our Service
1)Your inquiry will be replied within 2 hours during working time,Within 24hours when rest time.
2)Our working time is 7.30 AM --17:30 PM,Monday to Saturday.
3)General samples time can be arranged within 2--5days.
4)Orders will be produced exactly as request and approved samples.
5)When mass production,we send photos to show the production line.And confirm the estimate time again.
6)At the end of mass production,photos and samples will send to you for approval.You can arrange the inspection.
7)Before shipment,our QC will have inspection to make sure the quality.
8)We always try best to ensure every order to delivery in time.
 
Payment Terms
1)T/T,Cash,L/C.
2)30% deposit,70% balance before shipment.
3)Lead time: 15 days after received deposited for 2tons.
4)Delivery way: By sea,By air, By EMS,DHL,UPS,TNT,FedEx.
 
Packing & Delivery
For sample: By EMS,DHL,UPS,TNT,FedEx
                 around 5--7 working days to arrive
 
For Bulk order:
1.Qty of 2tons,within 15 days.
2.Via Sea
3.Delivery time:we will finish production in 15days for 2tons.
4.For 20 GP,may nee around 30days.

Product Application

Company Profile

Chunhuan Group (Zhenjiang Chunhuan Sealing Group Co., Ltd.), established in 1985, is a leading manufacturer of fluoroplastic products, chemical semiconductor linings, and new energy sealing gaskets. The company primarily focuses on the research, development, and production of fluoroplastic series sealing products (for hydrogen energy and nuclear power applications) and chemical semiconductor linings. With subsidiaries in South Korea and Shanghai, the group has also established a joint venture with South Korea's Houcheng Group for semiconductor lining equipment. Main  production: PTFE  products, metal  seals  series, steel  lining  anti-corrosion series, engineering plastics series,rubber products series,it is the leading enterprise in the national fluoroplastics industry. The  company  supplies  more  than  300  varieties  of  PTFE  composite modified  materials,ranging  from standard  composite modified  materials (bronze,glass fiber,carbon,graphite,etc.) to  customized  solutions  to  meet different  production  needs  of customers.The  company  provides  flexible  quantity  and  fast  delivery service. The engineers have 35 years working experience in the field of PTFE,serving customers in more than 30 countries.

Our Advantages

Certifications

Packaging & Shipping

FAQ

1.What is the main material of flexible graphite rings? Do they contain any binders or fillers?
A: The rings are made from high-purity flexible graphite tape through molding or lathe cutting, containing no resin, rubber, or metal binders. Grades with corrosion inhibitors (e.g., zinc powder) are available to enhance resistance against electrochemical corrosion.

2. What are the maximum temperature and pressure ratings for this product?
A: In oxidizing media, the recommended temperature range is -200°C to +450°C; in non-oxidizing media, it can withstand up to +650°C. The maximum pressure is typically 400 bar (≈40 MPa), depending on the sealing configuration.

3. Which media are flexible graphite rings suitable for? Can they be used in strong acid or strong alkali environments?
A: The rings exhibit excellent resistance to most corrosive media, including strong acids (except highly oxidizing acids like concentrated sulfuric and nitric acid), strong alkalis, organic solvents, steam, and hot oils. Long-term exposure to strongly oxidizing acids (e.g., fuming nitric acid) is not recommended.

4. What is the sealing mechanism of this product? Does it require high bolt preload?
A: Flexible graphite offers excellent compressibility and resilience, enabling an effective seal even under low bolt preload. When compressed, the graphite flakes interlock and fill microscopic irregularities on flange or valve stem surfaces.

5. What are the advantages of flexible graphite rings over PTFE or rubber sealing rings?
A: Compared to PTFE, flexible graphite rings have higher temperature resistance, better creep relaxation resistance, and superior thermal conductivity. Compared to rubber, they resist almost all chemicals and do not age or harden. They are ideal for high-temperature, high-pressure, thermal cycling, and highly corrosive applications.

6. How do I determine the required inner diameter, outer diameter, and height? Do you support custom non-standard sizes?
A: Simply provide the stem or shaft diameter (for ring ID), the stuffing box bore diameter (for ring OD), and the height of each ring. We support custom non-standard sizes from 3 mm up to over 500 mm, available as split angle-cut rings or solid rings.

7. What should I pay attention to when installing flexible graphite rings?
A: Clean the stuffing box and stem surface before installation. Insert rings one by one, compacting each with a dedicated sleeve; stagger the cuts of adjacent rings by 90°-120°. Tighten bolts evenly and symmetrically to avoid uneven compression. Never hammer the rings into place.

8. What is the service life of this product? How do I know when to replace it?
A: Service life depends on operating conditions (temperature, pressure, cycling frequency, etc.). In typical steam or hot oil systems, it can last 2-5 years. Replacement is needed when persistent minor leakage appears at the stem, the gland requires frequent re-tightening, or the rings become hardened and lose resilience.

9.Does long-term storage affect the performance of flexible graphite rings? How should they be stored?
A: Flexible graphite rings are virtually unaffected by storage time - no aging or hardening occurs. Store in a dry, clean, room temperature environment, away from oil, dust, and mechanical damage. No special light or humidity control is needed.