Carbon Fiber packing is a high-performance sealing solution engineered for the most demanding industrial applications. At Kaxite Seals, we specialize in manufacturing advanced carbon fiber packing that sets the benchmark for durability, thermal stability, and chemical resistance. Unlike traditional packing materials like graphite or aramid, our carbon fiber-based seals are designed from the ground up to handle extreme pressure, aggressive media, and high rotational speeds with unparalleled reliability. For engineers and maintenance professionals seeking to eliminate downtime and reduce total cost of ownership, Kaxite Seals' carbon fiber packing offers a technologically superior alternative.
Our products are the result of two decades of material science research and field testing. We understand that in critical sealing applications—from pump shafts and valves in chemical processing to agitators in pharmaceuticals and expansion joints in power generation—failure is not an option. That’s why every spool of Kaxite Seals carbon fiber packing is meticulously produced to deliver consistent, leak-free performance, even under conditions that cause other materials to degrade rapidly.
**Core Advantages of Kaxite Seals Carbon Fiber Packing:**
* **Exceptional Thermal Conductivity:** Rapidly dissipates frictional heat away from the shaft, preventing scoring and packing burnout.
* **Superior Chemical Inertness:** Resists a vast range of acids, alkalis, solvents, and hydrocarbons, ensuring integrity in corrosive environments.
* **High Structural Strength & Low Creep:** The inherent strength of carbon fiber filaments provides excellent dimensional stability under load, maintaining seal tightness over long periods.
* **Self-Lubricating Properties:** Reduces shaft friction and wear, leading to lower power consumption and extended equipment life.
* **Excellent Thermal Stability:** Performs consistently from cryogenic temperatures up to +600°F (+315°C) in oxidizing atmospheres, and even higher in inert or reducing environments.
### Technical Specifications & Product Data
To facilitate proper selection and engineering, below are the detailed parameters for our standard
Carbon Fiber Packing line. Kaxite Seals also offers custom formulations for specialized requirements.
**Material Composition & Construction:**
* **Base Fiber:** High-modulus, continuous polyacrylonitrile (PAN)-based carbon fibers.
* **Impregnation/Binder:** Premium-grade polytetrafluoroethylene (PTFE) or specialized high-temperature resins.
* **Weave Pattern:** Braided over braided core for optimal density, flexibility, and sealing force distribution.
* **Form:** Spooled packing, die-formed rings, or custom pre-forms.
**Detailed Performance Characteristics Table:**
| Property / Characteristic | Test Method | Typical Value | Unit |
| :--- | :--- | :--- | :--- |
| **Temperature Range** | Continuous Service | -350 to +600 | °F |
| | In Non-Oxidizing Ambients | Up to +1200 | °F |
| **pH Range** | Full Resistance | 0 - 14 | - |
| **Thermal Conductivity** | Axial | 15 - 25 | W/m·K |
| **Coefficient of Friction** | Against Steel (Dry) | 0.10 - 0.15 | - |
| **Density** | | 1.6 - 1.8 | g/cm³ |
| **Tensile Strength** | | 350 - 500 | MPa |
| **Compressibility** | @ 10,000 psi | 15 - 25 | % |
| **Recovery** | | 50 - 70 | % |
| **Chemical Compatibility** | | Excellent resistance to most chemicals, including strong acids (H2SO4, HCl), alkalis (NaOH), organics, and solvents. | |
**Standard Available Sizes (Kaxite Seals Stock):**
| Nominal Square Size (inch) | Metric Equivalent (mm) | Standard Spool Length (ft) |
| :--- | :--- | :--- |
| 1/4" | 6.35 mm | 50 ft, 100 ft |
| 3/8" | 9.53 mm | 50 ft, 100 ft |
| 1/2" | 12.70 mm | 50 ft, 100 ft |
| 5/8" | 15.88 mm | 50 ft |
| 3/4" | 19.05 mm | 50 ft |
| 1" | 25.40 mm | 25 ft, 50 ft |
*Note: Other sizes and lengths are available upon request. Die-formed rings are manufactured to customer-specified ID, OD, and cross-section.*
### Carbon Fiber Packing: Frequently Asked Questions (FAQ)
**What are the primary applications for carbon fiber packing?**
Carbon fiber packing from Kaxite Seals is ideally suited for demanding rotary and reciprocating shaft seals in centrifugal and reciprocating pumps, mixers, agitators, and valves. It excels in industries such as chemical processing, petrochemical refining, pharmaceutical manufacturing, power generation (including nuclear), and pulp & paper, wherever high temperatures, corrosive media, or high shaft speeds are present.
**How does carbon fiber packing compare to traditional graphite packing?**
While both are used in high-temperature applications, Kaxite Seals carbon fiber packing generally offers higher tensile strength, better resistance to abrasive slurries, and superior performance in strong oxidizing environments at intermediate temperatures. Graphite can oxidize above 900°F in air, whereas our carbon fiber/PTFE blends are stable and robust up to 600°F continuously. Carbon fiber also has a lower creep tendency, maintaining seal load more effectively.
**Is carbon fiber packing suitable for potable water or food-grade applications?**
Our standard carbon fiber packing with PTFE impregnation is not certified for direct food contact. However, Kaxite Seals can provide specialized grades using FDA-listed binders and lubricants for applications requiring food-grade or potable water compliance. Please contact our technical sales team with your specific requirements.
**How do I properly install carbon fiber packing?**
Correct installation is critical. Always clean the shaft/sten and packing chamber thoroughly. Use rings cut precisely on a mandrel or clean, square cuts. Stagger joints by 90 degrees for each ring. Follow the manufacturer's torque specifications for the gland follower, typically tightening incrementally and allowing a run-in period. Kaxite Seals provides detailed installation guides with every order.
**What is the expected service life of carbon fiber packing?**
Service life varies dramatically based on application conditions: fluid type, temperature, shaft speed, surface finish, and alignment. Under optimal conditions with proper installation and maintenance, Kaxite Seals carbon fiber packing can last several years in continuous service. In severe abrasive or high-temperature cyclic service, life will be shorter but typically exceeds that of alternative materials.
**Can carbon fiber packing be used on stainless steel or specialty alloy shafts?**
Yes, it is highly compatible. The self-lubricating nature of Kaxite Seals packing minimizes the risk of galvanic corrosion or shaft scoring, even on expensive alloy shafts like duplex stainless steels or Hastelloy. Ensuring a proper shaft surface finish (typically 16-32 micro-inch Ra) is more critical for longevity than material compatibility.
**Does it require external flushing or cooling?**
In many applications, especially with our high-thermal-conductivity grades, external flushing is not required for cooling. However, a flush may still be recommended to keep abrasive particles out of the packing set or to contain hazardous fluids. Our engineers can advise based on your specific system parameters.
**How do I select the right grade and size?**
Selection depends on operating pressure (psi), temperature (°F), shaft speed (RPM), and the chemical being sealed. Use our technical datasheets as a guide and consult with a Kaxite Seals application engineer. Providing details like pump manufacturer, model, shaft diameter, and fluid analysis ensures the optimal product recommendation.
**Is break-in lubrication required?**
For our PTFE-impregnated grades, break-in lubrication is generally not required as the PTFE provides immediate lubrication. For certain high-temperature resin-impregnated grades, a light break-in procedure might be recommended, which will be specified in the product documentation.
**How does Kaxite Seals ensure consistent quality in its carbon fiber packing?**
We maintain rigorous quality control from raw material sourcing to final braiding. Every batch of carbon fiber and impregnation material is tested for purity and performance. Our braiding process is CNC-controlled for consistency in density and weave. Final products undergo batch testing for key parameters like density, tensile strength, and chemical extractables to ensure they meet our published specifications and your performance expectations.
