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For engineers and maintenance professionals seeking a reliable, high-temperature sealing solution, Mineral Fiber Packing stands as a cornerstone technology. At Kaxite, we've refined this essential material into a product line engineered for extreme performance and durability. Unlike generic offerings, Kaxite Mineral Fiber Packing is meticulously manufactured using select high-purity mineral fibers, bonded with advanced proprietary compounds to deliver unmatched sealing integrity under punishing conditions. Its primary function is to create a tight, resilient seal in pumps, valves, flanges, and other equipment handling hot gases, molten media, and aggressive chemicals where conventional packings would rapidly fail.
The inherent properties of mineral fibers—exceptional thermal resistance, low thermal conductivity, and excellent chemical stability—are amplified through Kaxite's precise manufacturing process. This results in a packing material that not only withstands intense heat but also maintains its structural integrity, ensuring minimal leakage and extended service intervals. Whether you're operating in power generation, metal processing, chemical refining, or high-temperature filtration, specifying Kaxite Mineral Fiber Packing translates to enhanced safety, reduced downtime, and significant long-term cost savings by protecting critical equipment from wear and failure.
Understanding the precise specifications of sealing materials is crucial for correct application and optimal performance. Below are the core parameters that define Kaxite Mineral Fiber Packing.
| Parameter | Value / Range | Test Standard / Notes |
|---|---|---|
| Continuous Operating Temperature | Up to 1093°C (2000°F) | ASTM D-570 |
| Peak Short-Term Temperature | Up to 1260°C (2300°F) | |
| Thermal Conductivity | 0.05 - 0.07 W/m·K at 500°C | ASTM C-177 |
| Compression Recovery | > 85% | ASTM F36 |
| Chemical Resistance | Excellent to most acids, solvents, and molten metals (except hydrofluoric acid & strong alkalis) | Immersion testing per ASTM D-543 |
| Tensile Strength | 8 - 15 MPa | ASTM D-2256 |
| Recommended Compression Load | 30 - 60 N/mm² | For gland adjustment |
| Available Sizes (Square Section) | 3mm x 3mm to 25mm x 25mm (1/8" x 1/8" to 1" x 1") | Custom sizes available |
To address diverse application needs, Kaxite offers specialized grades of mineral fiber packing.
| Product Code | Grade Name | Key Feature | Ideal Application |
|---|---|---|---|
| KX-MF100 | Standard High-Temp | Cost-effective, braided construction for general service. | Flange gasketing, oven doors, exhaust systems up to 950°C. |
| KX-MF200 | Enhanced Sealing | Impregnated with high-temp lubricant for dynamic seals. | Pump shafts, valve stems in chemical & petrochemical service. |
| KX-MF300 | Ultra-Pure & Low Chloride | Chemically cleaned fibers, chloride content <50ppm. | Stainless steel systems, sensitive processes (e.g., food, semiconductor). |
| KX-MF400 | Anti-Extrusion | Reinforced with Inconel wire for extreme pressure/vibration. | High-pressure steam valves, aggressive cycling equipment. |
What is the primary advantage of Mineral Fiber Packing over asbestos-based packings?
Mineral Fiber Packing provides a safe, non-carcinogenic alternative to asbestos while matching or exceeding its thermal performance. Kaxite's packing is manufactured from biosoluble fibers, meaning they have low bio-persistence and pose minimal health risk if handled properly, ensuring compliance with modern health and safety regulations worldwide.
How do I determine the correct size and quantity of packing needed for a pump or valve?
You need two measurements: the shaft/stem diameter and the stuffing box bore diameter. The cross-section size of the packing is typically half the difference between these two diameters. For quantity, calculate the stuffing box depth (length) divided by the packing cross-section width. Our technical datasheets provide detailed formulas, and Kaxite's engineering support team can assist with specific calculations.
Can Kaxite Mineral Fiber Packing be used in oxidizing atmospheres?
Yes, it performs excellently in oxidizing atmospheres. The inorganic silica-based fibers are inherently resistant to oxidation. For long-term service above 1000°C in highly oxidizing environments, our KX-MF300 ultra-pure grade is specifically recommended to prevent any potential minor contamination from binders.
What is the proper installation procedure to ensure optimal performance?
Clean the stuffing box thoroughly. Cut packing rings on a clean, sharp mandrel with 45-degree staggered joints—never square cuts. Install rings one at a time, seating each firmly with a tamping tool and staggering joints by 90 degrees. Tighten the gland follower hand-tight only for initial startup. After thermal cycling, re-tighten gradually to achieve a slight leakage (1-2 drops per minute) for lubrication, which will seal as it runs in.
Is this packing suitable for sealing against molten aluminum or salts?
Yes, Kaxite Mineral Fiber Packing is highly resistant to wetting and penetration by many molten non-ferrous metals, including aluminum, zinc, and their salts. Its low thermal conductivity helps maintain a temperature gradient that solidifies a thin layer of metal at the interface, enhancing the seal. Confirm specific chemical compatibility with our team for your exact media.
How does the packing perform under thermal cycling and vibration?
The material's high compression recovery (>85%) allows it to maintain seal tightness during thermal expansion and contraction cycles. For applications with severe vibration or pulsation, the KX-MF400 grade with Inconel wire reinforcement is designed to resist extrusion and packing bore wear, ensuring a stable, long-lasting seal.
What are the limits of chemical resistance?
While resistant to most acids, organic solvents, and steam, prolonged exposure to strong alkaline solutions (pH >12) or hydrofluoric acid (HF) will degrade the silica fibers. For such services, alternative materials like PTFE or specialty graphite packings should be considered. Always consult the Kaxite chemical resistance chart for detailed guidance.
Can used Kaxite Mineral Fiber Packing be replaced easily?
Yes. Due to its non-brittle nature and the proprietary binders used, the packing typically does not fuse to the shaft or housing. It can be removed in complete rings using packing hooks, making maintenance clean and efficient, reducing downtime during repacking operations.
