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No. 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
In the demanding world of industrial sealing, selecting the right material is not just a choice—it's a critical operational decision. For engineers and procurement specialists across chemical processing, power generation, oil & gas, and aerospace sectors, the search for a reliable, high-performance sealing solution often leads to one superior material: Graphite Packing. Renowned for its exceptional thermal stability, chemical inertness, and self-lubricating properties, graphite packing forms the backbone of leak-free operations in extreme environments.
At Kaxite, we have dedicated decades to mastering the science and engineering of advanced graphite-based sealing solutions. Our Kaxite Graphite Packing is not merely a product; it is the culmination of rigorous research, precision manufacturing, and an unwavering commitment to quality. We understand that your equipment's integrity and your plant's safety depend on the seals you specify. That's why every strand of Kaxite packing is engineered to deliver uncompromising performance, longevity, and cost-efficiency, setting the industry benchmark for excellence.
The superiority of Kaxite Graphite Packing stems from its unique molecular structure and our proprietary enhancement processes. Unlike traditional packing materials like asbestos or aramid fibers, our pure, high-crystalline graphite offers a combination of benefits that are essential for modern industry:
To ensure precise selection and application, Kaxite Graphite Packing is available in multiple styles and grades. Below are the detailed specifications for our core product lines.
Our flagship product, manufactured from 99.9% pure, flexible graphite filament, reinforced with an Inconel wire insert for enhanced structural integrity. Ideal for pumps, valves, and agitators.
| Parameter | Specification / Value | Test Standard |
|---|---|---|
| Material Composition | 99.9% Pure Flexible Graphite, Inconel 600/316SS Wire Insert | ASTM D7219 |
| Temperature Range | -200°C to 600°C (in air); Up to 3000°C (inert atm.) | ASTM E831 |
| pH Range | 0 – 14 (All acidic & alkaline media) | - |
| Density | 1.6 – 1.9 g/cm³ (adjustable) | ASTM D3800 |
| Thermal Conductivity | >100 W/m·K (in-plane, at 25°C) | ASTM E1461 |
| Compression Recovery | >40% | API 622 / ISO 18647 |
| Chemical Weight Loss | < 2% (in 10% HNO3, 24h, 100°C) | ASTM D471 |
| Available Sizes (Square) | 3mm, 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 20mm | - |
| Standard Packing | Coils of 50 feet, 100 feet; Pre-cut rings available | - |
Designed for large flanges, heat exchangers, and expansion joints where high resilience and excellent sealing under low bolt loads are required.
| Parameter | Specification / Value |
|---|---|
| Structure | Corrugated/Embossed Pure Graphite Foil |
| Thickness | 0.5mm, 0.75mm, 1.0mm, 1.5mm, 2.0mm |
| Width | 10mm to 1000mm (custom widths available) |
| Compressibility | >50% |
| Recommended Stress | 15 – 25 MPa |
| Maximum Service Pressure | Up to 20 MPa (2900 psi) |
Q: What is the primary difference between graphite packing and traditional braided packing like PTFE or aramid?
A: The core differences lie in temperature capability, chemical resistance, and lubrication. Graphite packing can withstand significantly higher temperatures (up to 600°C in air) compared to PTFE (260°C max) or aramid (300°C max). It is chemically inert to a broader range of media. Crucially, graphite is self-lubricating, which reduces wear on the shaft, whereas traditional packings often require external lubricants that can wash out or degrade.
Q: Can Kaxite Graphite Packing be used on high-speed rotary equipment?
A: Yes, absolutely. Kaxite's graphite filament packing, especially with the metal wire reinforcement, is specifically engineered for dynamic applications including high-speed centrifugal pumps and mixers. Its excellent thermal conductivity dissipates frictional heat, and its self-lubricating property maintains low friction coefficients, making it suitable for surface speeds up to 25 m/s. Proper installation and break-in procedures are critical for optimal performance in high-speed service.
Q: How do I install graphite packing correctly to ensure a long service life?
A: Correct installation is paramount. First, clean the stuffing box thoroughly. Cut packing rings on a clean surface using a sharp blade and a mandrel of exact shaft/stem diameter—never wrap and cut. Stagger ring joints by 90 degrees. Install rings one at a time, seating each firmly with a packing tool. For pumps, tighten the gland finger-tight only, then start the pump. Gradually tighten the gland in 1/4-turn increments during operation until a slight drip (1-2 drops per minute for cooling) is achieved. Overtightening is the most common cause of premature failure.
Q: Is graphite packing suitable for oxygen or strong oxidizing agent services?
A: Caution is required. While pure graphite has excellent chemical resistance, it can oxidize in the presence of pure oxygen or strong oxidizers (e.g., nitric acid, chlorine) at elevated temperatures, leading to accelerated wear. For such services, Kaxite offers specially treated Oxidation-Inhibited Graphite Packing. This grade contains impregnated inhibitors that dramatically slow the oxidation rate, making it the recommended choice for oxidizing environments above 400°C.
Q: What factors determine the choice between graphite filament packing and corrugated graphite foil?
A: The choice is application-driven. Use Graphite Filament Packing (braided/rope style) for dynamic sealing in pumps, valves, and agitators—anywhere there is movement between the shaft and housing. Use Corrugated Graphite Foil for static sealing applications such as flanges, heat exchangers, manways, and expansion joints. The corrugated structure provides exceptional resilience and sealing force at lower bolt loads, conforming easily to irregular surfaces.
Q: How does Kaxite ensure the quality and consistency of its graphite packing?
A: Kaxite's quality assurance is integrated at every stage. We start with sourcing the highest purity natural or synthetic graphite. Our proprietary exfoliation and calendaring processes are tightly controlled. Every production batch undergoes rigorous in-house testing for key parameters like density, chemical loss, tensile strength, and thermal conductivity against ASTM and ISO standards. We maintain full traceability from raw material to finished coil, ensuring the performance you specify is the performance you receive, batch after batch.
Q: Can you supply graphite packing in custom sizes or pre-formed shapes?
A: Yes, customization is a core strength at Kaxite. Beyond our standard square and rectangular sizes, we routinely manufacture custom cross-sections (round, trapezoidal), extremely large or small sizes, and die-cut gaskets or spiral-wound rings to precise customer drawings. Our engineering team can assist in designing the optimal packing profile for your unique equipment geometry.
Selecting Kaxite Graphite Packing means investing in a sealing solution engineered for reliability under pressure. Our technical support team is ready to assist with material selection, installation guidance, and troubleshooting to ensure your operations achieve maximum uptime and safety.
0086-574-87527773
No. 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China