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Mineral fiber packing is a specialized sealing material engineered for demanding high-temperature applications. Composed primarily of inorganic fibers, often derived from minerals like alumina and silica, it is designed to withstand extreme heat where organic materials would degrade. This type of packing is essential for creating effective seals in valves, pumps, and flanges within industries such as power generation, chemical processing, and refining. Its inherent resistance to heat, corrosion, and thermal shock makes it a reliable, long-lasting solution for containing aggressive media under severe operating conditions.
Kaxite Sealing has developed a superior range of mineral fiber packing products by leveraging decades of material science expertise. Our packings are not just commodities; they are precision-engineered solutions.
To ensure proper selection and performance, below are the detailed specifications for the standard Kaxite Sealing mineral fiber packing series. These parameters are critical for engineers and maintenance professionals.
| Parameter | Specification / Value | Test Standard / Notes |
|---|---|---|
| Primary Fiber Composition | High-Purity Alumina-Silica | - |
| Continuous Service Temperature | Up to 1200°C (2192°F) | ASTM D-4000 |
| Maximum pH Range | 0 - 14 | Except Hydrofluoric Acid & Strong Alkalis |
| Density | 1.8 - 2.2 g/cm³ | ASTM D-3800 |
| Tensile Strength | > 15 MPa | ASTM D-2256 |
| Thermal Conductivity | 0.15 - 0.25 W/m·K @ 500°C | ASTM C-177 |
| Compression Set | < 15% | ASTM F-36 |
| Available Sizes (Square Section) | 3mm, 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm | Custom sizes available on request |
| Braiding Style | Plaited, Braided-on-Core, Die-Molded Rings | Style depends on application (Pump, Valve, etc.) |
| Lubricant / Impregnation | High-Temp Graphite & PTFE Dispersions | Enhances lubricity and sealing |
| Color | White / Off-White | - |
| Kaxite Series | MF-1000 | MF-1200 HT | MF-800 CR |
|---|---|---|---|
| Max Temp | 1000°C (1832°F) | 1200°C (2192°F) | 800°C (1472°F) |
| Key Feature | General Purpose, Cost-Effective | Ultra-High Temperature, Peak Performance | Optimized for Corrosive Chemical Services |
| Ideal For | Boiler Doors, Heat Exchanger Flanges | Incinerators, High-Temp Kilns, Exhaust Systems | Acid/Alkali Pumps, Chemical Reactor Flanges |
| Standard Lubricant | Graphite | Special High-Temp Binder | PTFE & Corrosion Inhibitors |
Q: What is the main difference between mineral fiber packing and graphite foil?
A: While both are used for high-temperature sealing, they differ fundamentally in form and function. Mineral fiber packing is a braided or molded cord/rope used in stuffing boxes to create an adjustable, compressive seal around a moving shaft (like a pump) or a static flange. Graphite foil is a flat sheet or tape, often used as gasketing material between static flanges. Mineral fiber packing offers better resilience and adaptability in dynamic applications, whereas graphite foil excels in providing a uniform seal across large, flat surfaces.
Q: How do I properly install mineral fiber packing in a pump stuffing box?
A: Correct installation is critical for performance and longevity. First, clean the stuffing box and shaft thoroughly. Cut individual packing rings using a mandrel or by wrapping around the shaft—never cut straight. Stagger the ring joints by 90 degrees as you install each ring. Use a proper packing tool to seat each ring firmly. After installing all rings, hand-tighten the gland follower. Start the pump and allow it to run hot, then gradually tighten the gland in small increments (about 1/6 of a turn) over several hours/days until a slight weeping leak is achieved for lubrication and cooling. Over-tightening will cause excessive heat and wear.
Q: Can Kaxite Sealing mineral fiber packing be used in oxygen service?
A: This requires extreme caution. While our mineral fiber base material is inherently non-combustible, the lubricants (like graphite) can pose a risk in high-pressure oxygen environments. We offer special grades with compatible, oxygen-service lubricants. Always consult Kaxite Sealing's technical datasheets and ensure the specific packing grade is certified for your oxygen service pressure and concentration before application. Never use standard graphite-impregnated packing in oxygen systems.
Q: What causes mineral fiber packing to fail prematurely?
A: Premature failure typically stems from a few common issues: 1) Improper Selection: Using a grade not rated for the specific temperature or chemical media. 2) Incorrect Installation: Over-tightening, under-tightening, or not staggering joints. 3) Shaft/Stem Damage: A scored or pitted shaft will quickly abrade any packing. 4) Insufficient Lubrication/Cooling: In pump applications, a complete lack of weepage can lead to frictional heat buildup, drying out the packing and causing it to crack. 5) Chemical Attack: Exposure to specific chemicals, like hydrofluoric acid, not compatible with the packing's composition.
Q: How does the performance of mineral fiber packing compare to modern braided ceramic fiber packing?
A: Both are top-tier for high temperatures. Traditional mineral fiber packing (alumina-silica) offers an excellent balance of performance, resilience, and cost for most applications up to ~1200°C. Advanced braided ceramic fiber packings (using fibers like polycrystalline alumina) can withstand even higher temperatures (above 1400°C) and offer superior purity for sensitive processes. However, they are often more brittle and significantly more expensive. Kaxite Sealing provides both; our technical team can help you select the most cost-effective solution based on your exact temperature, media, and motion requirements.
Q: Is there a break-in procedure required for new mineral fiber packing?
A: Yes, a controlled break-in is essential, especially for pumps. The procedure involves incremental tightening of the gland follower as described in the installation FAQ. This allows the packing to gradually adapt to the heat and friction, enabling the lubricants to distribute evenly and the fibers to seat properly. A proper break-in minimizes initial leakage, prevents overheating, and extends the service life of both the packing and the equipment shaft.
Selecting Kaxite Sealing means partnering with a specialist focused on reliability and performance. Our mineral fiber packings are the result of intensive R&D and real-world testing. We control the manufacturing process from raw material selection to final braiding and impregnation, ensuring consistent quality in every spool and ring. Our technical support team, comprised of experienced engineers, is available to assist with product selection, installation guidance, and troubleshooting to maximize your equipment's uptime and efficiency. We provide more than just a product; we deliver a sealing solution backed by expertise and a commitment to solving your high-temperature challenges.
