In demanding industrial environments where extreme temperatures, aggressive chemicals, and high pressures are the norm, reliable sealing isn't just a preference—it's an absolute necessity for safety, efficiency, and cost control. For decades, professionals have turned to Mineral Fiber Packing as a cornerstone solution for these severe service applications. At Kaxite, we have refined this essential technology, engineering our packing to deliver unparalleled performance and longevity where other materials fall short.
Kaxite Mineral Fiber Packing is manufactured from high-purity inorganic fibers, bonded with specialized lubricants and sealants. This composition creates a robust, resilient packing braid capable of withstanding thermal shock, chemical attack, and mechanical stress. Unlike organic packings that degrade under heat or swell when exposed to certain fluids, mineral fiber maintains its structural integrity, providing a stable and dependable seal over extended periods.
Choosing the right packing material directly impacts maintenance schedules, emission control, and operational uptime. Here are the key benefits that set Kaxite Mineral Fiber Packing apart:
Understanding the precise parameters of sealing material is crucial for proper selection and application engineering. Below are the detailed specifications for the standard Kaxite Mineral Fiber Packing series.
| Property | Specification / Value | Test Standard |
|---|---|---|
| Base Fiber | High-purity Alumino-Silicate | - |
| Binder/Lubricant | Proprietary Graphite & High-Temp Grease | - |
| Specific Gravity | 1.8 - 2.2 g/cm³ | ASTM D792 |
| pH Range (Resistance) | 0 - 14 | - |
| Thermal Conductivity | 0.5 - 0.7 W/m·K | ASTM C177 |
| Compression Recovery | > 85% | API 622 / FSA |
| Parameter | Minimum | Maximum | Notes |
|---|---|---|---|
| Temperature | -100°F (-73°C) | 1200°F (650°C) | Continuous; higher peaks possible |
| Pressure | Full Vacuum | 2500 psi (172 bar) | Dependent on size & equipment |
| Shaft Speed | Static | 25 ft/s (7.6 m/s) | For rotary applications |
| pH | 0 (Strong Acid) | 14 (Strong Alkali) | Full range resistance |
Kaxite Mineral Fiber Packing is supplied in continuous coils, spools, or pre-cut rings to suit your maintenance practices.
| Cross-Section (Square) | Standard Coil Length | Spool Size | Pre-Cut Ring Kits |
|---|---|---|---|
| 1/8" (3 mm) | 50 ft (15.2 m) | 5 lb (2.3 kg) Spool | Available for common valve sizes |
| 1/4" (6 mm) | 50 ft (15.2 m) | 10 lb (4.5 kg) Spool | Available for common valve sizes |
| 3/8" (10 mm) | 25 ft (7.6 m) | 10 lb (4.5 kg) Spool | Available for common valve sizes |
| 1/2" (13 mm) | 25 ft (7.6 m) | 10 lb (4.5 kg) Spool | Available for common valve sizes |
| 5/8" (16 mm) | 25 ft (7.6 m) | 10 lb (4.5 kg) Spool | On request |
| 3/4" (19 mm) | 25 ft (7.6 m) | 10 lb (4.5 kg) Spool | On request |
This versatile packing is the go-to choice for numerous challenging sealing points across various industries. Key applications include:
Q: Is Kaxite Mineral Fiber Packing suitable for rotating equipment like centrifugal pumps?
A: Yes, it is an excellent choice for many rotary pump applications, especially where temperature or chemical resistance is a primary concern. For high-speed rotary shafts (above 25 ft/s), we recommend consulting our engineering team to ensure optimal performance and life. The packing's low friction and good thermal conductivity help manage heat generation at the seal interface.
Q: Can this packing be used for valves handling superheated steam?
A: Absolutely. Kaxite Mineral Fiber Packing is extensively used in steam service up to 1200°F. Its inorganic fibers will not carbonize or burn off, and the graphite lubrication remains effective at high temperatures, ensuring a reliable, leak-controlled seal for steam valves, bonnets, and stems.
Q: How does it perform against strong acids like sulfuric or hydrochloric acid?
A: It offers outstanding resistance. The inorganic mineral fibers are inherently inert to most acids and alkalis across the entire pH spectrum. Unlike some PTFE-based packings that can be affected by certain chemicals, mineral fiber maintains its sealing integrity and dimensional stability when exposed to aggressive acids and bases.
Q: What is the proper procedure for installing this packing?
A: Ensure the stuffing box is clean and free of old packing. Cut rings on a clean surface using a sharp blade and a mandrel of the correct shaft/stem diameter. Stagger the ring joints by 90 degrees. Install rings one at a time, seating each firmly with a packing tool. Tighten the gland follower hand-tight only for initial installation. After startup and heat cycling, make incremental adjustments (typically 1/6th of a turn) to the gland nuts until a slight leakage (a few drops per minute) is observed for run-in. Allow this run-in period before final tightening to achieve the ideal seal.
Q: How often will the packing need adjustment or replacement?
A: Service life varies greatly based on application conditions like temperature, pressure, shaft speed, and media. Under typical high-temperature service, Kaxite packing often provides significantly longer service intervals than conventional materials. Minimal adjustment is usually required after the initial run-in period. Replacement is needed when gland adjustment no longer controls leakage to acceptable levels.
Q: Does it require a break-in period?
A: Yes, a proper break-in period is crucial. The packing should be allowed to seat and the lubricants to distribute. Start with the gland nuts hand-tight, then gradually tighten in small increments over several hours or days of operation while allowing a slight cooling leakage. This process polishes the shaft and conditions the packing for long-term, low-friction operation.
Q: Is Kaxite Mineral Fiber Packing asbestos-free?
A: Yes. All Kaxite sealing products are rigorously tested and certified to be 100% asbestos-free. We use modern, high-purity synthetic mineral fibers that provide superior performance without the health risks associated with historical asbestos-based packings.
Q: Is it approved for use in potable water systems?
A: While chemically inert, standard Kaxite Mineral Fiber Packing is not specifically certified for potable water contact. For such applications, we recommend inquiring about our NSF-approved specialty packing formulations.
