In the demanding world of industrial sealing, selecting the right gasket is critical for ensuring system integrity, preventing leaks, and maximizing operational safety and efficiency. Among the various sealing solutions available, Corrugated Gaskets stand out for their unique combination of flexibility, resilience, and high sealing force. These gaskets are engineered to handle challenging conditions in pipelines, pressure vessels, heat exchangers, and other critical equipment across industries like oil & gas, chemical processing, power generation, and petrochemicals. For over two decades, Kaxite Sealing has been at the forefront of designing and manufacturing premium corrugated gaskets that meet the most stringent international standards, providing reliable performance where it matters most.
The fundamental design of a corrugated gasket features a metallic core with a concentric, wavy (corrugated) pattern. This core is often clad or covered with a soft, conformable filler material such as graphite, PTFE, or ceramic fiber. This ingenious construction delivers several key advantages:
Kaxite Sealing's expertise ensures that each corrugated gasket is precision-engineered, considering factors like flange design (raised face, flat face, tongue-and-groove), operating conditions, and media compatibility to deliver optimal, leak-free performance.
Understanding the technical specifications is crucial for correct gasket selection. Below are the detailed parameters for Kaxite Sealing Corrugated Gaskets.
The performance of a corrugated gasket is directly determined by its material composition. Kaxite Sealing offers a comprehensive selection.
| Metal Core Material | Typical Grades | Temperature Range | Key Characteristics & Applications |
|---|---|---|---|
| Stainless Steel | 304, 304L, 316, 316L, 321 | -250°C to +800°C | Excellent corrosion resistance, general purpose for chemical, petrochemical, and food processing. |
| Carbon Steel | C.S. 1020, 1045 | -40°C to +500°C | High strength and economy, suitable for steam, water, oil, and gas services in non-corrosive environments. |
| Nickel Alloys | Monel 400, Inconel 600/625, Hastelloy C276 | Up to +1000°C | Superior resistance to extreme corrosion, oxidation, and high temperatures. Used in severe service. |
| Copper & Aluminum | Copper C11000, Aluminum 1100 | Up to +400°C (Cu), +300°C (Al) | Excellent thermal conductivity, often used in heat exchangers and low-temperature applications. |
| Filler/Facing Material | Temperature Range | pH Range | Key Characteristics & Applications |
|---|---|---|---|
| Flexible Graphite | -200°C to +450°C (in air)* *Up to 3000°C in inert gas |
0-14 (except strong oxidizers) | Superior chemical resistance, excellent thermal conductivity, self-lubricating. Most versatile filler. |
| PTFE (Teflon) | -200°C to +260°C | 0-14 (Universal) | Outstanding chemical inertness, low friction, non-stick. Ideal for aggressive chemicals and ultra-pure media. |
| Ceramic Fiber (Aramid) | Up to +1000°C | 2-12 | Exceptional fire resistance and high-temperature stability. Common in thermal oil, exhaust, and fire-safe applications. |
| Non-Asbestos Organic (NAO) | Up to +300°C | 3-11 | Cost-effective, good sealability for general industrial water, air, and mild chemical services. |
Kaxite Sealing corrugated gaskets are manufactured to precise dimensional and performance standards.
The following table provides a general guideline for maximum working pressure based on temperature for a common Kaxite Sealing configuration (304SS Core with Flexible Graphite Facing, Class 150 Flange). Always consult our engineering team for specific applications.
| Temperature (°C) | Max. Working Pressure (bar) | Temperature (°F) | Max. Working Pressure (psi) |
|---|---|---|---|
| -50 to +100 | 20 | -58 to +212 | 290 |
| +150 | 18 | +302 | 261 |
| +200 | 16 | +392 | 232 |
| +250 | 14 | +482 | 203 |
| +300 | 12 | +572 | 174 |
| +350 | 10 | +662 | 145 |
Q: What are the primary applications where corrugated gaskets are the best choice?
A: Corrugated gaskets are exceptionally versatile and are ideally suited for a wide range of demanding applications. They are a premier choice for heat exchangers (shell and tube, plate), due to their ability to handle thermal cycling. They are extensively used in refinery and petrochemical piping for hydrocarbons, steam, and process fluids. Their reliability makes them standard in power plant boiler manways, turbine casings, and high-pressure steam lines. Additionally, they perform well in chemical processing equipment, compressor fittings, and any flanged connection requiring a robust seal under variable pressure and temperature conditions where spiral wound gaskets or flat sheet gaskets may not be optimal.
Q: How do I select the correct metal and filler material combination for my service?
A: Material selection is a three-step process. First, identify the chemical composition, concentration, and phase (liquid, gas) of the media being sealed to ensure full chemical compatibility with both the metal core and the filler. Second, determine the continuous and peak operating temperatures; the materials must withstand these without degrading. Third, consider the pressure and any potential for pressure shocks or cycling. For example, for concentrated sulfuric acid at moderate temperatures, a PTFE-faced gasket with a Hastelloy core might be specified. For high-temperature steam, a graphite-faced stainless steel gasket is common. Kaxite Sealing provides detailed chemical compatibility charts and expert engineering support to guide this critical selection.
Q: What is the difference between a corrugated metal gasket with a filler and a spiral wound gasket?
A: While both are composite metal gaskets, their construction and behavior differ. A spiral wound gasket is made by winding pre-formed metal strips and filler material in a V-shape, creating a series of concentric circles. It is highly compressible and excellent for wide pressure-temperature ranges. A corrugated gasket has a pre-formed, solid metal core with a corrugated (wavy) pattern, to which the filler is bonded. The corrugated gasket typically requires a lower bolt load to seat effectively, offers higher resilience (spring-back), and can provide a better seal on flanges with less-than-perfect surface finish due to the conformability of its facing. The choice depends on flange type, available bolt load, and specific sealing requirements.
Q: Can Kaxite Sealing corrugated gaskets be used for fire-safe applications?
A: Yes, absolutely. Kaxite Sealing offers specific fire-safe corrugated gasket designs that comply with industry standards such as API 607, API 6FB, and ISO 10497. These gaskets typically feature a metal core (like 316 stainless steel) with a ceramic fiber or specially treated graphite filler that maintains its integrity and prevents catastrophic leakage in the event of a fire, even after the filler material is consumed. An inner metal ring is often recommended in fire-safe designs to contain the filler and provide a secondary metal-to-metal seal under extreme conditions.
Q: What are the recommended flange surface finishes and flatness for optimal performance with corrugated gaskets?
A: For best results, flange sealing surfaces should be clean, undamaged, and free of old gasket material, rust, and pits. The ideal surface finish (Ra) is between 3.2 μm and 6.3 μm (125 μin and 250 μin). A finish that is too smooth (e.g., below 1.6 μm) may not provide enough "bite" for the filler, while a finish that is too rough can cause excessive filler wear and embedment. Flange flatness is critical; the maximum allowable deviation is typically specified in flange standards (e.g., ASME B16.5). For high-performance sealing, parallelism and flatness should be verified. Kaxite Sealing gaskets can accommodate minor imperfections, but proper flange condition is essential for a reliable, long-lasting seal.
Q: How should corrugated gaskets be installed and torqued?
A: Correct installation is paramount. First, ensure the flange faces are clean and aligned. Place the gasket carefully centered on the flange. Never reuse a corrugated gasket. Use calibrated torque wrenches and follow a cross-bolting pattern (star pattern) in multiple passes to ensure even compression. The specific torque value should be calculated based on the bolt size, grade, gasket type, and target seating stress (often provided by Kaxite Sealing's datasheets). A common practice involves 30% of final torque on the first pass, 60% on the second, and 100% on the final pass. After the system has been in service and undergone a thermal cycle, a hot re-torque may be recommended to compensate for any relaxation.
Q: Does Kaxite Sealing offer custom-designed corrugated gaskets for non-standard applications?
A> Yes, custom engineering is a core strength of Kaxite Sealing. We regularly manufacture corrugated gaskets in non-standard sizes, unusual shapes (oval, rectangular, square), with special thicknesses, and in unique material combinations to meet specific customer challenges such as extreme cryogenic temperatures, ultra-high vacuum, or exposure to novel chemical compounds. Our technical team can work from your drawings, specifications, or a detailed description of the operating conditions to develop a sealing solution tailored precisely to your equipment's needs.
Copyright © 2015-2025 Ningbo Kaxite Sealing Materials Co., Ltd. All Rights Reserved.
