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In the world of industrial sealing, where extreme temperatures, aggressive media, and relentless pressure are commonplace, selecting the right sealing component is not just a choice—it’s a critical engineering decision. At Kaxite Sealing, we specialize in manufacturing premium sealing solutions that meet the most rigorous demands. Our Die-formed Graphite Ring stands as a testament to this commitment, offering unparalleled reliability and performance. Unlike conventional machined rings, our die-formed process ensures superior material integrity, consistent density, and a flawless sealing surface right out of the tooling, providing a perfect seal from the moment of installation.
| Property | Test Method | Typical Value | Unit |
|---|---|---|---|
| Carbon Content (Minimum) | ASTM D5618 | 99.0 | % |
| Density (As-formed) | ASTM F1315 | 1.8 - 2.2 | g/cm³ |
| Compressibility | ASTM F36 | 15 - 25 | % |
| Recovery | ASTM F36 | 40 - 60 | % |
| Thermal Conductivity | ASTM E1461 | 80 - 120 (W/m·K) | W/m·K |
| Maximum Service Temperature (Oxidizing) | - | 850 | °F |
| Maximum Service Temperature (Inert/Reducing) | - | 3000 | °F |
| pH Range | - | 0 - 14 | - |
| Parameter | Standard Range | Custom Availability |
|---|---|---|
| Inner Diameter (ID) | 0.25" to 120" (6mm to 3048mm) | Yes |
| Cross-Section (Width x Thickness) | From 1/16" x 1/16" to 2" x 2" | Yes |
| Density Grades | Standard (1.8 g/cm³), High-Density (2.0 g/cm³), Ultra-Density (2.2 g/cm³) | Yes |
| Facing/Cladding Options | Plain Graphite, Perforated Steel Core Insert, Tanged Metal Foil Facing (304SS, 316SS, Inconel) | Yes |
| Standards | ASTM, DIN, ISO, ASME, Custom OEM Drawings | Yes |
Q: How does a die-formed graphite ring differ from a machined graphite ring?
A: The fundamental difference lies in the manufacturing process. A machined ring is cut from a block of molded graphite, which can expose cut fibers and create potential leak paths along the grain. A die-formed ring, like those from Kaxite Sealing, is created by compressing flexible graphite directly into a precision die. This results in a ring with uniform density, no cut edges, superior grain orientation for better sealing, and enhanced mechanical strength, especially in thinner cross-sections.
Q: Can Kaxite Sealing die-formed graphite rings be used in high-pressure applications?
A: Absolutely. While pure flexible graphite has a lower blow-out resistance compared to some materials, Kaxite Sealing offers reinforced versions specifically for high-pressure service. Our rings can be manufactured with an internal perforated steel core or with metal foil facings (such as stainless steel). These reinforcements significantly increase the ring's resistance to extrusion and blow-out, allowing them to perform reliably in pressures exceeding 2,500 psi, depending on the gap and service conditions.
Q: What are the temperature limits, and do they require oxidation protection?
A: In inert, vacuum, or reducing atmospheres, our graphite rings can withstand temperatures up to 3000°F (1650°C). In continuous oxidizing atmospheres (air), the upper limit is typically 850°F (454°C) for long-term service. For intermittent oxidizing service, they can handle short-term exposure up to 1200°F (650°C). For applications in oxidizing environments above 850°F, we strongly recommend our rings with oxidation-inhibited graphite or metal foil facings, which dramatically slow the oxidation rate and extend service life.
Q: Are these rings suitable for all chemical services?
A: Flexible graphite is one of the most chemically inert sealing materials available. Kaxite Sealing die-formed rings are resistant to nearly all acids, alkalis, solvents, hydrocarbons, and severe corrosive media across a full pH range of 0-14. The primary exceptions are strongly oxidizing acids at high concentrations (e.g., nitric, sulfuric above 98%) and certain molten metals. For applications with these specific media, consulting with Kaxite Sealing engineers is advised to confirm suitability or recommend an alternative facing material.
Q: How do I select the correct density grade for my application?
A: Density is a critical factor affecting sealing force, creep resistance, and recovery. Kaxite Sealing offers three primary grades. Standard Density (1.8 g/cm³) is ideal for general-purpose applications with good compressibility. High-Density (2.0 g/cm³) provides better load-bearing capacity and lower creep for flanges with high bolt load or elevated temperature. Ultra-Density (2.2 g/cm³) is designed for the most demanding services, including high pressure, high temperature, and for use as spiral wound gasket filler, offering maximum anti-extrusion and thermal stability.
Q: What is the shelf life and how should I store these rings?
A: When stored properly, Kaxite Sealing die-formed graphite rings have an indefinite shelf life. They should be kept in their original packaging in a clean, dry, and temperature-stable environment. It is important to protect them from dust, moisture, and physical damage. Avoid stacking heavy objects on them to prevent deformation. Unlike elastomers, graphite does not cure or degrade over time, ensuring the seal is ready for service whenever needed.
Q: Does Kaxite Sealing provide custom sizes and configurations?
A: Yes, customization is a core strength of Kaxite Sealing. While we maintain a vast inventory of standard sizes, our engineering team is equipped to produce die-formed graphite rings to any non-standard inner diameter, cross-section, or density requirement. We can also incorporate various metal inserts, facings, and even produce non-circular shapes (oval, rectangular, etc.) based on your technical drawings or sample parts. Our goal is to provide a perfect sealing solution for your unique application.
