Welcome to Kaxite, your trusted partner for high-performance sealing solutions. In demanding industrial environments, reliability is non-negotiable. That's where our premium Aramid Fiber Packing comes into play. Engineered for excellence, this packing material leverages the extraordinary properties of aramid fibers to deliver superior sealing performance under extreme conditions of pressure, temperature, and chemical exposure. For over two decades, Kaxite has been at the forefront of sealing technology, and our Aramid Fiber Packing represents the culmination of this expertise.
Aramid fiber packing is a braided sealing material primarily composed of synthetic aramid fibers, known globally by brands like Kevlar® and Twaron®. These fibers belong to a class of high-strength, heat-resistant polyamides. When processed into braided packing, they create a robust, durable, and versatile seal ideal for a vast range of rotary, reciprocating, and valve stem applications. Unlike traditional packing materials like graphite or flax, aramid packing offers a unique combination of high tensile strength, exceptional thermal stability, and remarkable resistance to wear and abrasion.
At Kaxite, we don't just supply aramid packing; we engineer it. Our proprietary braiding techniques and carefully selected lubricant impregnations (such as PTFE, graphite, or synthetic oils) ensure optimal performance, reduced break-in time, and extended service life, minimizing downtime and maintenance costs for your operations.
Selecting the right packing requires precise data. Below are the detailed specifications for Kaxite's standard Aramid Fiber Packing. Custom formulations are available upon request to meet specific application challenges.
| Parameter / Property | Specification / Value | Notes & Test Standards |
|---|---|---|
| Primary Fiber Material | High-Modulus Aramid (Kevlar® / Twaron® type) | Premium, continuous filament for uniform strength. |
| Temperature Range | -100°F to +550°F (-73°C to +288°C) | Short-term exposure up to 600°F (316°C) possible. |
| pH Range | 2 - 12 (for standard impregnation) | Special impregnations available for stronger acids/alkalis. |
| Density (Typical) | 85 - 95 lbs/ft³ (1.36 - 1.52 g/cm³) | Ensures optimal sealing density in the gland. |
| Tensile Strength | > 40,000 psi (276 MPa) | ASTM D-885. Provides high resistance to blow-out. |
| Thermal Conductivity | Low | Acts as a thermal insulator, protecting equipment. |
| Standard Impregnation | PTFE (White), Graphite (Black), or Synthetic Oil | PTFE for broad chemical compatibility; graphite for high-temp lubrication. |
| Available Styles | Braided Square, Braided Round, Twist/Plait | Square braid is most common for pump and valve stems. |
| Standard Sizes (Square Section) | 1/8", 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8", 3/4", 1" | Other sizes and custom die-formed rings available. |
| Typical Applications | Pump Shafts, Valve Stems, Mixers, Agitators, Expansion Joints | Ideal for hot water, steam, chemicals, and hydrocarbons. |
| Material | Max Temp (°F) | Key Strength | Key Limitation | Best For |
|---|---|---|---|---|
| Kaxite Aramid | 550 | High Strength, Abrasion Resistance, Versatility | Not for strong acids/oxidizers | Hot water, steam, chemicals, general service |
| Graphite Foil | 1200+ | Extreme Temperature, Thermal Conductivity | Low mechanical strength, brittle | High-temperature valves & flanges |
| PTFE (Teflon) | 500 | Universal Chemical Inertness | Cold flow, high thermal expansion | Aggressive chemicals, food/pharma |
| Carbon Fiber | 600 | High Temp, Good Conductivity | Can be abrasive, higher cost | High-speed pumps, hot oils |
| Flax / Jute | 250 | Low Cost, Easy to Install | Low temp limit, swells with water | Cold water, general low-duty service |
Q: What are the main applications for Kaxite Aramid Fiber Packing?
A: Kaxite Aramid Packing is exceptionally versatile. Its most common applications include sealing centrifugal and rotary pump shafts, valve stems (especially in steam and hot water service), mixers and agitators, expansion joints, and reciprocating equipment. It is the go-to choice for services involving hot water (up to and above 212°F/100°C), saturated and superheated steam, hydrocarbons, oils, solvents, alkalis, and many chemical process streams.
Q: How does aramid packing handle high-pressure environments?
A: The inherent high tensile strength of the aramid fibers makes this packing highly resistant to extrusion and blow-out. When properly braided and densified by Kaxite, it maintains excellent structural integrity in high-pressure pump and valve applications. The braided construction allows it to compress uniformly in the gland, creating a tight, multi-layer seal that withstands significant system pressures without failing.
Q: Is aramid fiber packing abrasive to my pump shaft or valve stem?
A: No, this is a key advantage. Unlike some carbon-based packings, high-quality aramid fiber packing like Kaxite's is non-abrasive. The fibers are flexible and smooth, especially when impregnated with PTFE or graphite. This property significantly reduces wear on the shaft or sleeve, prolonging the life of both the packing and the expensive equipment it seals.
Q: Can I use it for acidic or caustic services?
A: Aramid fibers themselves have good resistance to many chemicals, but the overall chemical compatibility depends heavily on the impregnating lubricant. Our standard PTFE-impregnated aramid packing has excellent resistance to a wide pH range (typically 2-12) and handles many acids and alkalis well. For highly concentrated acids, strong oxidizing agents, or specific harsh chemicals, please consult Kaxite's engineering team for a custom recommendation or a specialized packing material.
Q: What is the correct installation procedure for this packing?
A: Proper installation is critical for performance and longevity. Key steps include: 1) Clean the shaft/sleeve and gland thoroughly. 2) Cut packing rings neatly using a sharp blade and a mandrel of the correct size—never wrap and cut. 3) Stagger the ring joints by 90 degrees or more. 4) Install rings one at a time, seating each firmly using a split bushing or appropriate tool. 5) Tighten the gland follower evenly, hand-tight only initially. 6) After startup, allow a brief run-in period (15-30 minutes) and then re-tighten the gland just enough to achieve a minimal, controlled leakage for lubrication and cooling. Never overtighten.
Q: How do I choose between PTFE-impregnated and graphite-impregnated aramid packing?
A: The choice depends on your service conditions. PTFE (white) impregnation offers the broadest chemical resistance, is FDA-compliant for incidental food contact, and provides excellent lubrication in wet services. Graphite (black) impregnation is superior for high-temperature applications (especially above 450°F/232°C), provides excellent thermal conductivity to dissipate heat from the shaft, and is ideal for dry or steam services. The Kaxite team can help you select the optimal type.
Q: What sizes and forms does Kaxite offer?
A: Kaxite supplies Aramid Fiber Packing in standard square braid, round braid, and twisted/plaited forms. It is available in continuous coils, spools, or pre-cut boxed sets. Standard square cross-section sizes range from 1/8" to 1". We also offer custom die-molded rings for specific gland dimensions, which ensure a perfect fit and reduce installation errors and time.
