Professional Introduction to Graphite Packing Rings
Graphite packing rings are high-performance sealing components primarily made from high-purity graphite. Leveraging their unique layered crystal structure, they exhibit exceptional performance in industrial sealing applications. This product employs advanced manufacturing processes to ensure stable physical and chemical properties, making it widely applicable in sealing solutions for various demanding conditions.
Core Performance Advantages
1. Exceptional Temperature Resistance
Standard operating range: -200°C to 450°C
Can withstand temperatures up to 1600°C in inert gas environments
Excellent thermal conductivity (50-120 W/(m·K)), providing superior heat dissipation
2. Outstanding Self-Lubricating Properties
Low friction coefficient, as low as 0.08 (dry friction conditions)
Low interlayer shear strength, facilitating the formation of transfer films
Suitable for oil-free lubrication conditions
3. Excellent Chemical Stability
Resistant to strong acid and alkali corrosion (pH 0-14)
Tolerant of most organic solvents
Good oxidation resistance (≤400°C in air)
Product Series Specifications
This product line includes four major series to meet different operational needs:
1. Standard Flexible Graphite Rings
Density: 1.6-1.7 g/cm³
Compression: 25-30%
Suitable for standard static sealing
2. Metal-Reinforced Type
Incorporates stainless steel wire mesh
Compressive strength increased to 45-60 MPa
Suitable for dynamic sealing applications
3. Impregnated Modified Type
Impregnated with resin or metal
Porosity < 10%
Suitable for corrosive media
4. Special Composite Type
Carbon fiber reinforced
Wear resistance improved by 300%
Suitable for high-speed rotating equipment
Typical Application Fields
Energy & Power: Steam turbine shaft seals, boiler valves
Petrochemical: Compressors, reactors
Process Industry: Pump mechanical seals
Special Equipment: Aerospace propulsion systems
Quality Assurance System
1. Raw Material Control
Graphite purity ≥ 99%
Ash content ≤ 0.5%
Particle size distribution testing
2. Production Process Control
Molding pressure ≥ 50 MPa
Precise heat treatment process control
100% dimensional inspection
3. Finished Product Testing
Density testing
Compression resilience testing
Leakage rate testing
Installation and Usage Guide
1. Pre-installation Preparation
Clean sealing surfaces (Ra 0.8-1.6 µm)
Check packing ring dimensions
Apply graphite lubricating paste (optional)
2. Installation Specifications
Install using staggered cuts
Tighten layer by layer (15-20 MPa per layer)
Control total compression to 25 ± 2%
3. Operation and Maintenance
Initial 50-hour run-in period
Regularly check tightening force
Replenish lubrication every 2000 hours
Precautions
1. Operating temperature should not exceed 400°C in oxidizing environments.
2. Avoid contact with strong oxidizing media.
3. Sudden drastic temperature changes may cause cracking.
4. For high-pressure conditions, use in conjunction with metal-reinforced rings is recommended.
Graphite packing rings, with their excellent overall performance, have become the preferred sealing solution for demanding conditions such as high temperatures and corrosion. We recommend that users select the appropriate model based on specific operating parameters and strictly follow the specifications for installation and maintenance to ensure optimal sealing performance and service life. For special conditions, we can provide customized solutions.
Product Types
| Type |
Characteristics |
Applicable Scenarios |
| Flexible Graphite Rings |
Good compressibility |
Pipeline flange sealing |
| Reinforced Graphite Rings |
High mechanical strength |
Pump/valve dynamic sealing |
| Impregnated Graphite Rings |
Low permeability |
Corrosive media |
| Carbon-Graphite Rings |
Strong wear resistance |
High-speed rotating equipment |
Basic Performance Parameters
| Performance Indicator |
Parameter Range |
Test Standard |
Remarks |
| Material Composition |
Graphite ≥ 99% |
GB/T 3518 |
Reinforcing materials can be added |
| Operating Temperature |
-200°C ~ 450°C |
ASTM D7216 |
Up to 1600°C in inert gases |
| Density |
1.6-1.8 g/cm³ |
ISO 5017 |
Varies with impregnation |
| Porosity |
15-25% |
ASTM C838 |
Affects sealing performance |
| Coefficient of Friction |
0.08-0.15 |
ASTM D1894 |
Dry friction conditions |
| Compression |
20-30% |
ASTM F36 |
Under 15 MPa pressure |
Product Specification Comparison
| Model |
Cross-section Shape |
Size Range (mm) |
Reinforcing Material |
Applicable Conditions |
| G-100 |
Square |
3×3 ~ 30×30 |
None |
Static Sealing |
| G-200 |
Round |
Φ5 ~ Φ50 |
Stainless Steel Wire |
Dynamic Sealing |
| G-300 |
Custom Shape |
Custom |
Carbon Fiber |
High-Pressure Sealing |
| G-400 |
Braided Type |
Width 5~50 |
Ceramic Fiber |
Ultra-High Temperature |
