In the demanding world of industrial sealing, reliability under extreme conditions is paramount. Mineral Fiber Packing stands as a premier choice for engineers and maintenance professionals seeking a robust, heat-resistant sealing material. Composed primarily of high-purity inorganic fibers, often from basalt or silica-based rock wool, this packing is engineered to perform where organic materials fail. Its inherent properties make it indispensable for applications involving high temperatures, aggressive media, and dynamic equipment. Unlike traditional packings that can degrade, melt, or lose compression, mineral fiber packing maintains its structural integrity, ensuring long-term, leak-free operation. This makes it a critical component for enhancing safety, reducing downtime, and optimizing operational efficiency in heavy industries. The versatility of this material allows it to be tailored with various lubricants and corrosion inhibitors, further expanding its application range across different chemical environments and mechanical stresses.
Our mineral fiber packing is manufactured to the highest international standards, ensuring consistent quality and performance. The following specifications detail the core attributes that define our product's superiority in the market.
| Grade Code | Fiber Type | Max Temp (°F/°C) | Lubricant/Additive | Primary Applications | Standard Size (Inch) |
|---|---|---|---|---|---|
| MF-1000 | Basalt Fiber | 1200°F / 649°C | PTFE Dispersion | Boiler Doors, Expansion Joints | 1/4", 3/8", 1/2", 5/8" |
| MF-1200HT | Alumino-Silicate Fiber | 1400°F / 760°C | High-Temp Graphite | High-Temp Valves, Flue Ducts | 3/16", 1/4", 3/8", 1/2" |
| MF-800CR | Silica Fiber | 1000°F / 538°C | Corrosion Inhibitor | Chemical Pumps, Acid Services | 1/4", 3/8", 1/2", 3/4" |
| MF-950AT | Basalt/Silica Blend | 1100°F / 593°C | Food-Grade Lubricant | Food Processing, Ovens | 3/16", 1/4", 3/8" |
| Property | Test Standard | Typical Value (MF-1000 Grade) | Unit |
|---|---|---|---|
| Specific Heat Capacity | ASTM E1269 | 0.25 | cal/g·°C |
| Linear Shrinkage (after 24h @ 1200°F) | ASTM C356 | < 3% | % |
| Compression Set (22h @ 75°F & 1000 psi) | ASTM F36 | 15% | % |
| Thermal Expansion Coefficient | ASTM E228 | 5.5 x 10⁻⁶ | in/in·°F |
| Chemical Resistance (Weight Loss in 10% H₂SO₄, 24h) | ASTM D471 | < 2% | % |
What is the primary advantage of using mineral fiber packing over asbestos-based packing?
Mineral fiber packing is a completely non-asbestos, safe, and environmentally friendly alternative. It offers comparable or superior high-temperature performance, excellent chemical resistance, and does not pose the health risks associated with asbestos fibers. Its inorganic nature ensures it will not combust or contribute to fire spread, enhancing workplace safety.
How do I correctly install mineral fiber packing in a pump or valve?
Proper installation is critical for performance. Ensure the stuffing box is clean, dry, and free of old packing debris. Cut new packing rings squarely using a sharp knife or a mandrel for precision. Stagger the ring joints by 90 degrees for each subsequent ring. Use a stuffing box tool to tamp each ring firmly into place, avoiding excessive force that could damage the fibers. Follow the manufacturer's recommended torque settings for the gland follower to achieve the correct compression, allowing for a brief run-in period where slight leakage may occur before the packing seats properly.
Can mineral fiber packing be used in applications involving strong acids or alkalis?
Yes, specific grades like our MF-800CR are formulated with enhanced corrosion inhibitors and are made from silica-based fibers that exhibit excellent resistance to a wide range of acids and alkalis. However, it is crucial to consult the chemical resistance chart for the specific grade, as prolonged exposure to hydrofluoric acid and strong phosphoric acids may not be recommended. Always verify compatibility with your process media.
What is the expected service life of mineral fiber packing?
Service life varies significantly based on operating conditions, including temperature, pressure, media, shaft speed, and alignment. Under standard conditions in a well-maintained system with temperatures below 1000°F (538°C) and proper installation, a service life of 12 to 18 months is typical. In more severe services, such as high-temperature valves, life may be 6-12 months. Regular maintenance checks for gland adjustment can extend the packing's effective life.
Is lubrication required for mineral fiber packing, and what type is compatible?
Most mineral fiber packings are pre-impregnated with a high-temperature lubricant such as PTFE or graphite during manufacturing, which is sufficient for initial operation. In some cases, especially during run-in or for specific low-friction requirements, an external lubricant might be recommended. Use only compatible, high-temperature tube oils or graphite-based pastes. Avoid petroleum-based greases at high temperatures as they can carbonize and impede packing performance.
How does mineral fiber packing perform under thermal cycling conditions?
Mineral fiber packing excels in thermal cycling applications due to its low thermal expansion coefficient and excellent recovery properties. The inorganic fibers do not become brittle upon repeated heating and cooling cycles. They maintain their flexibility and sealing force, preventing the leaks that often occur with materials that harden or permanently deform under thermal stress.
What are the safety considerations when handling and disposing of mineral fiber packing?
While mineral fibers are generally safer than asbestos, it is good practice to handle them with care. Wear appropriate personal protective equipment (PPE) such as gloves and safety glasses to prevent minor skin or eye irritation from loose fibers. During removal of old packing, dampen it to suppress dust. Disposal should follow local regulations for industrial waste; it is typically classified as non-hazardous waste but should be disposed of responsibly in sealed bags.
Can this packing be used in potable water or food processing applications?
Yes, select grades like MF-950AT are specifically engineered with food-grade lubricants and meet relevant standards for incidental contact with food and potable water. These grades are manufactured under controlled conditions to ensure they do not leach harmful substances and are suitable for ovens, mixers, and other equipment in the food and beverage industry.
