Custom Mineral Fiber Packing Solutions for Wholesale and Export

Mineral Fiber Packing is a high-performance, industrial sealing material engineered for demanding applications where extreme temperatures, aggressive chemicals, and high pressures are present. As a leader in sealing solutions, Kaxite Sealing has refined the formulation and manufacturing of our mineral fiber packing to deliver unmatched reliability and longevity in critical service. This material is composed of high-purity inorganic fibers, typically derived from minerals like rock or slag wool, which are then treated with lubricants and binders to create a flexible, yet durable, sealing yarn or braided packing. Unlike organic packings, Kaxite Sealing's mineral fiber packing is inherently non-combustible and maintains its structural integrity from sub-zero conditions up to intense heat. This makes it the go-to choice for sealing valves, pumps, flanges, and expansion joints in industries such as power generation (including nuclear), chemical processing, metallurgy, marine, and incineration. Its primary function is to prevent the leakage of hot gases, molten metals, acids, alkalis, and other challenging media, ensuring operational safety, environmental compliance, and reduced maintenance costs. **Key Characteristics of Kaxite Sealing Mineral Fiber Packing:** * **Exceptional Temperature Resistance:** Withstands continuous temperatures up to 600°C (1112°F) and short-term peaks even higher, depending on the specific grade. * **Superior Chemical Inertia:** Resists attack from a wide range of acids, alkalis, solvents, and molten metals, ensuring stable performance in corrosive environments. * **Low Thermal Conductivity:** Provides excellent insulation properties, protecting equipment and personnel from extreme heat. * **Non-Asbestos & Environmentally Safe:** Kaxite Sealing's packing is manufactured with no asbestos, meeting global health and safety regulations. * **Flexibility and Conformability:** Easily forms to the sealing surface, creating an effective seal with proper gland adjustment. * **Low Chloride & Fluoride Content:** Critical for applications in sensitive environments like nuclear power plants to prevent stress corrosion cracking. ### Detailed Product Specifications & Technical Data To specify the correct packing for your application, understanding the precise parameters is essential. Below are the detailed specifications for Kaxite Sealing's standard mineral fiber packing series, KX-MF500. #### Physical & Mechanical Properties | Property | Test Standard | Unit | Value (Typical) | | :--- | :--- | :--- | :--- | | **Temperature Range** | - | °C / °F | **Continuous:** -100 to +600°C / -148 to +1112°F
**Peak:** Up to 750°C / 1382°F | | **Density** | ASTM F 1315 | g/cm³ | 1.8 – 2.2 | | **pH Value** | ASTM E70 | - | 7.0 – 8.5 (Neutral) | | **Thermal Conductivity** @ 200°C | ASTM C177 | W/m·K | 0.08 – 0.12 | | **Tensile Strength** | - | N/mm² | ≥ 15 | | **Compression Set** | ASTM F 36 | % | ≤ 35 | | **Chloride Content** | - | ppm | < 50 | | **Fluoride Content** | - | ppm | < 50 | #### Chemical Compatibility Chart The following table outlines the resistance of Kaxite Sealing Mineral Fiber Packing to various media. Ratings: **E=Excellent, G=Good, F=Fair (Limited Service), N=Not Recommended.** | Chemical Media | Concentration | Resistance | Chemical Media | Concentration | Resistance | | :--- | :--- | :--- | :--- | :--- | :--- | | **Sulfuric Acid** | Up to 70% | G | **Sodium Hydroxide** | All conc. | E | | **Hydrochloric Acid** | Up to 30% | G | **Ammonia** | Aqueous | E | | **Nitric Acid** | Up to 50% | F | **Hydrogen Peroxide** | 30% | G | | **Phosphoric Acid** | Up to 85% | G | **Toluene** | 100% | E | | **Acetic Acid** | Up to 80% | G | **Fuel Oil** | - | E | | **Molten Aluminum** | Up to 800°C | G | **Steam** | Saturated & Superheated | E | | **Molten Zinc** | Up to 500°C | F | **Hot Flue Gases** | - | E | #### Available Sizes & Configurations Kaxite Sealing offers mineral fiber packing in a variety of standard sizes and forms to fit most equipment. Custom sizes are available upon request. * **Standard Square Section Sizes (mm):** * 3x3, 4x4, 5x5, 6x6, 8x8, 10x10, 12x12, 14x14, 16x16, 19x19, 22x22, 25x25. * **Standard Round Section Sizes (mm diameter):** * 3, 4, 5, 6, 8, 10, 12, 14, 16, 19, 22, 25. * **Packing Rings:** Pre-cut rings are available for all standard sizes, reducing installation time and waste. * **Spools & Coils:** Supplied in continuous lengths on spools (typically 25kg or 50kg) for custom cutting on-site. * **Core Material:** Packing can be supplied with an Inconel wire core (KX-MF500IC) for added mechanical strength and temperature resistance in extremely dynamic applications. ### Mineral Fiber Packing - Frequently Asked Questions (FAQ) **What are the primary applications for mineral fiber packing?** Mineral fiber packing is specifically designed for sealing applications involving extreme temperatures and aggressive chemicals. Common uses include: sealing valves and pumps in chemical plants handling acids/alkalis, expansion joints and flanges in power plant boiler systems, furnace doors and ladles in metal foundries, incinerator access ports, and heat treatment equipment. Its non-melting property is crucial for safety in fire-prone scenarios. **How does mineral fiber packing compare to graphite or PTFE packing?** While graphite packing offers excellent thermal conductivity and high-temperature stability, mineral fiber packing provides superior insulation and better resistance to certain molten metals and strong oxidizers. Compared to PTFE, mineral fiber operates at much higher temperatures (PTFE degrades above 260°C). PTFE is better for lower-temperature, high-purity chemical services. Kaxite Sealing mineral fiber packing fills the niche for the most severe thermal and chemical challenges. **Is Kaxite Sealing Mineral Fiber Packing safe to handle and use?** Yes. Our packing is 100% asbestos-free, complying with all international safety standards (OSHA, REACH, etc.). The inorganic fibers are bound with lubricants, so standard personal protective equipment (gloves, safety glasses) is recommended during handling to prevent minor skin irritation from fiber dust. It is non-toxic and does not release harmful fumes when heated within its rated range. **What is the correct installation procedure for this type of packing?** Proper installation is key to performance. Clean the stuffing box thoroughly. Wrap the packing loosely around the shaft or stem to determine the correct ring length, then cut at a 45-degree angle. Stagger the joints by 90 degrees for each successive ring. Use a tamping tool to seat each ring firmly but avoid over-compressing. Adjust the gland follower evenly, allowing the packing to "break-in." Final tightening should be done after the equipment has reached operating temperature, as the packing will soften and seat further. **How do I select the right size and grade of packing?** The packing cross-section should match the clearance between the shaft/stem and the stuffing box wall. Measure the shaft diameter and the bore of the stuffing box: (Bore - Shaft)/2 = Packing Size. For aggressive chemical service, specify the standard KX-MF500. For applications with high shaft speed or vibration, consider the Inconel wire reinforced grade KX-MF500IC. Consult Kaxite Sealing's engineering team for complex media or temperature combinations. **What are the signs that my mineral fiber packing needs replacement?** Increased leakage that cannot be controlled by gentle gland adjustment is the primary indicator. Other signs include a significant increase in friction or heat generation on the shaft, visible degradation or hardening of the packing material, or excessive wear on the shaft itself. Proactive replacement during scheduled maintenance is always recommended over a failure. **Can this packing be used on rotating equipment like pump shafts?** Yes, it is suitable for both rotary and reciprocating pump shafts, especially in hot oil or chemical service. However, for high-speed rotary applications, a lubricant flush might be necessary to manage heat from friction. The Inconel wire reinforced grade (KX-MF500IC) is specifically recommended for dynamic service due to its enhanced mechanical strength. **Does it require any special break-in or run-in procedure?** After installation and initial hand-tightening of the gland, start the equipment and bring it to a low load or temperature. Gradually tighten the gland nuts in small increments (1/6th of a turn at a time) while the equipment is running and warming up, until the leakage is reduced to a slight drip or vapor. Allow the system to reach full operating temperature and condition for 24 hours, then make a final minor adjustment. The goal is a slight leakage for lubrication and cooling during break-in.