In the demanding world of industrial sealing and gasketing, uncompromising performance is non-negotiable. Compression sheets are the cornerstone of creating reliable, long-lasting seals in high-pressure, high-temperature, and chemically aggressive environments. At their core, compression sheets are engineered sealing materials, typically supplied in sheet form, designed to be cut into custom gaskets. Their fundamental purpose is to fill the microscopic irregularities between two mating flanges, creating a barrier that prevents the leakage of fluids, gases, or vapors. Unlike basic gasket materials, premium compression sheets from Kaxite Sealing are formulated to exhibit exceptional recovery and creep relaxation properties. This means they compress under bolt load to form an initial seal but are specifically engineered to maintain a significant percentage of that sealing force over time, even under cyclic thermal and pressure conditions. This resistance to "setting" or "cold flow" is what separates high-performance sheets from inferior products, ensuring flange integrity and operational safety for the long term. From chemical processing plants and power generation facilities to offshore oil platforms and pharmaceutical manufacturing, the correct selection of a compression sheet is critical for preventing downtime, ensuring environmental compliance, and protecting capital equipment.
For over two decades, Kaxite Sealing has been at the forefront of advanced sealing technology. Our commitment to material science, rigorous testing, and deep application understanding allows us to produce compression sheets that consistently outperform industry standards. We don't just supply material; we provide sealing solutions. Each Kaxite compression sheet is developed with a clear understanding of the complex interplay between temperature, pressure, medium, and flange design. Our products are trusted by maintenance engineers, plant managers, and OEMs globally because they deliver predictable, reliable performance where it matters most. Our technical support team works alongside customers to analyze application specifics, ensuring the selected sheet material—be it our high-grade compressed non-asbestos, premium PTFE-based, or specialized graphite sheets—is perfectly matched to the service conditions, thereby optimizing seal life and system reliability.
Selecting the right compression sheet requires careful consideration of its physical and chemical properties. Below is a detailed breakdown of the key parameters for Kaxite Sealing's primary compression sheet series. These specifications are derived from extensive laboratory testing per ASTM, DIN, and other international standards.
| Product Grade | KAX-CNA 3010 (Standard) | KAX-PTFE 4500 (Chemical Resistant) | KAX-GRAPH 6000 (High Temp) | KAX-ARAMID 3500 (High Strength) |
|---|---|---|---|---|
| Color | Blue | White | Black | Orange |
| Density (g/cm³) | 1.8 - 2.0 | 2.1 - 2.3 | 1.9 - 2.1 | 1.7 - 1.9 |
| Temp. Range (°C) | -100 to +400 | -200 to +260 | -200 to +600 (Inert Atmos.) | -50 to +300 |
| Max. Pressure (Bar) | 150 | 120 | 100 | 200 |
| Tensile Strength (MPa) | 12.0 | 15.0 | 8.0 | 25.0 |
| Compression Set (%) | 15 | 10 | 8 | 12 |
| pH Range | 1 - 12 | 0 - 14 | 0 - 14 (Oxidizing agents除外) | 2 - 11 |
| Primary Applications | General purpose, water, steam, mild chemicals | Aggressive chemicals, pharmaceuticals, food processing | High-temp heat exchangers, exhausts, boiler systems | High bolt load flanges, pumps, heavy machinery |
Q: How do I choose the right compression sheet grade for my application?
A: Selection depends on four critical factors: the fluid or gas being sealed (chemical compatibility), the continuous and peak operating temperatures, the system pressure (including pressure cycling), and the flange condition/surface finish. Always consult the chemical resistance and temperature/pressure ratings for the specific grade. For complex applications, Kaxite Sealing's technical team can provide a detailed recommendation based on your process data sheets (PDS).
Q: Can I re-use a gasket made from a compression sheet?
A: It is generally not recommended to re-use a compressed gasket. During the initial bolting, the sheet material undergoes plastic and elastic deformation to conform to the flange faces. Upon disassembly, this deformation is permanent, and the material's recovery properties are partially exhausted. Re-using such a gasket significantly increases the risk of a leak path developing. For reliable sealing, always install a new gasket cut from fresh sheet material.
Q: What is the difference between "compression set" and "creep relaxation," and why are they important?
A: Both relate to the material's ability to maintain sealing force, but they describe different phenomena. Compression Set is the percentage of original thickness that a material does not recover after a compressive load is released. A low value (e.g., 10%) indicates good recovery. Creep Relaxation is the gradual loss of sealing stress in a gasket while it is under constant compressive load and temperature over time. A material with low creep relaxation, like Kaxite's grades, retains bolt load better, maintaining seal integrity for longer periods without re-torquing.
Q: Do I need to apply a sealant or lubricant to a compression sheet gasket?
A: Typically, no. High-quality compression sheets from Kaxite Sealing are designed to create an effective seal directly against clean, dry flange surfaces. The use of sealants can sometimes be detrimental, as they may introduce chemicals that degrade the sheet's binders or fillers, or create a slippery interface that affects friction during bolting. Exceptions are very specific applications, such as sealing porous cast iron flanges, where a thin application of a suitable flange sealant might be advised. Always refer to the product installation guide.
Q: How should I store compression sheets, and do they have a shelf life?
A: Proper storage is crucial for maintaining material properties. Sheets should be stored flat in their original packaging in a cool, dry, and dark environment, away from direct sunlight, heat sources, ozone generators, and chemicals. Ideal storage temperature is between 10°C and 25°C (50°F - 77°F). While most grades do not have a strict expiration date, it is best practice to use them within 5 years of manufacture. Always inspect the sheet for dryness, cracking, or distortion before use.
Q: What is the proper bolt torque procedure for gaskets made from these sheets?
A: Correct bolting is essential. Always follow a cross-pattern, multi-step torquing sequence to ensure even compression across the gasket face. The final target torque value should be calculated based on the gasket material's stress-to-seal value (provided in our datasheets), bolt size/grade, and flange design. Under-torquing can cause immediate leakage, while over-torquing can crush the gasket, damaging its internal structure and leading to premature failure. Using a calibrated torque wrench is mandatory for critical applications.
The versatility of Kaxite Sealing compression sheets makes them suitable for a vast array of industries. Each sector presents unique challenges that our product range is designed to meet.
Even the highest-quality compression sheet will underperform if installed incorrectly. Adhering to these best practices ensures a safe, reliable, and leak-free seal.
