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In the demanding world of industrial sealing, reliability isn't just an expectation; it's a prerequisite for safety, efficiency, and operational continuity. For over two decades, Kaxite Sealing has been at the forefront of sealing technology, engineering solutions that withstand the most extreme conditions. Among our flagship products, Expanded Graphite Gaskets stand out as a cornerstone of modern sealing technology. These gaskets are engineered from pure, exfoliated graphite, offering an unmatched combination of thermal resilience, chemical stability, and sealing force. Unlike traditional materials that degrade under stress, our graphite gaskets maintain their integrity, ensuring a leak-free seal from cryogenic temperatures up to intense heat, all while conforming perfectly to flange faces.
Kaxite Sealing's expanded graphite gaskets are manufactured under stringent quality controls. We start with high-purity natural graphite, which is chemically expanded to create a flexible, vermiform structure. This process results in a material with exceptional natural lubricity, high thermal conductivity, and outstanding resistance to creep relaxation. Whether you are dealing with aggressive chemicals in chemical processing, superheated steam in power generation, or volatile hydrocarbons in oil and gas applications, our gaskets provide a dependable, long-lasting seal that reduces maintenance downtime and total cost of ownership.
Understanding the precise capabilities of a sealing material is critical for proper selection and application. Below are the detailed parameters that define the superior performance of Kaxite Sealing's Expanded Graphite Gaskets.
| Product Code | Standard Size (ID x OD x Thickness) | Density (g/cm³) | Max Pressure (Bar) | Standard Facing | Primary Application |
|---|---|---|---|---|---|
| KX-EG-100 | Custom / ASME B16.21 | 1.1 | 150 | Plain / Unfaced | General Service, Heat Exchangers |
| KX-EG-200 | Custom / ASME B16.21 | 1.3 | 300 | Stainless Steel Foil Laminate (0.05mm) | High-Pressure Steam, Petrochemical |
| KX-EG-310 | Custom / EN 1514 / DIN | 1.15 | 100 | Perforated Steel Core Insert | Aggressive Chemicals, Acids |
| KX-EG-450 | Custom / ASME B16.21 | 1.0 | 75 | Corrugated Metal Foil | Low Bolt Load Applications, HVAC |
Note: All dimensions, including Inner Diameter (ID), Outer Diameter (OD), and Thickness, can be fully customized to your specific flange drawings and requirements. Pressure ratings are for guidance and depend on flange design, bolting, and temperature.
Q: What are the main advantages of using expanded graphite gaskets over traditional asbestos or compressed non-asbestos (CNAF) gaskets?
A: Expanded graphite gaskets offer several superior advantages. They provide excellent thermal stability across a much wider temperature range than CNAF. They have superior chemical resistance to a vast array of media, excluding strong oxidizers. Their natural lubricity and high compressibility allow them to seal effectively on lower bolt loads and imperfect flange finishes. Crucially, they exhibit minimal creep relaxation, meaning the seal integrity lasts longer without retorquing. They are also inherently fire-safe and do not contain hazardous fibers like asbestos.
Q: Can Kaxite Sealing expanded graphite gaskets be used in FDA or drinking water applications?
A: Yes, specific grades of our pure expanded graphite material are compliant with FDA regulations 21 CFR §177.2600 for rubber articles intended for repeated use in contact with food. We also offer grades certified for use with potable water (WRAS, KTW, NSF/ANSI 61). It is essential to specify your regulatory requirement when inquiring so we can provide the correct, certified material batch.
Q: How do I choose between an unfaced graphite gasket and one with a metal foil or insert?
A: The choice depends on application parameters. Unfaced or plain expanded graphite gaskets (like our KX-EG-100) offer maximum conformability and are ideal for heat exchangers and general service. Adding a thin stainless steel foil laminate (KX-EG-200) significantly improves handling strength, prevents material blow-out in high-pressure steam lines, and provides a barrier against galvanic corrosion. Gaskets with a perforated steel core insert (KX-EG-310) offer exceptional mechanical strength and dimensional stability for large diameters or aggressive chemical service, preventing excessive compression.
Q: What are the limitations of expanded graphite? When should I not use it?
A: The primary limitation is exposure to strong oxidizing agents. Expanded graphite gaskets should not be used in services with concentrated nitric acid, sulfuric acid above 98%, bromine, or chlorine trifluoride, as these can rapidly oxidize the graphite. They are also not recommended for applications with highly abrasive media unless protected by a suitable facing. For applications involving strong oxidizers, Kaxite Sealing recommends alternative materials such as PTFE or specific elastomers.
Q: What is the proper installation procedure for a Kaxite expanded graphite gasket?
A: Correct installation is key to performance. First, ensure flanges are clean, undamaged, and aligned. Never use cutting agents or graphite sprays on the gasket. Center the gasket carefully on the flange. Use a cross-bolt tightening pattern (star pattern) in multiple incremental steps—typically 30%, 60%, and finally 100% of the target bolt load—to ensure even compression. We always recommend following ASME PCC-1 guidelines for bolted joint assembly. Retorquing after the first heat cycle is often recommended for critical services. Our technical datasheets provide detailed, application-specific installation guidance.
Q: Does Kaxite Sealing provide custom shapes and sizes?
A: Absolutely. Customization is a core strength of Kaxite Sealing. We routinely manufacture expanded graphite gaskets in any custom shape—circular, oval, square, rectangular, or complex geometries—directly from your CAD drawings, sketches, or samples. We can also provide special facings, embossing, or eyelets for handling. Our engineering team can assist in material selection and design for unique or challenging applications.
The versatility of Kaxite Sealing's expanded graphite gaskets makes them the sealing component of choice across a diverse range of industries. In the power generation sector, they reliably seal superheated and saturated steam lines, turbine casings, and heat recovery steam generators (HRSGs), where temperature and pressure cycling are constant challenges. Chemical and petrochemical plants utilize our gaskets for reactors, columns, and heat exchangers handling corrosive acids, alkalis, and hydrocarbons due to their broad chemical compatibility.
In oil and gas refineries, they are specified for critical service on flanges in crude units, reformers, and cokers. The pharmaceutical and food processing industries benefit from our FDA-compliant grades for hygienic and sanitary applications. Furthermore, their performance in cryogenic applications, such as LNG processing and storage, demonstrates their remarkable functional range. For HVAC systems, engine exhausts, and any application involving thermal cycling, the high recovery and stability of our graphite gaskets prevent leaks and ensure system integrity over long service periods.
