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No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China
In the vast world of construction, manufacturing, automotive, and aerospace, the integrity of joints, gaps, and interfaces is paramount. Sealing materials are the engineered products designed to prevent the passage of fluids, gases, dust, noise, and even fire between two or more substrates. They are the unsung heroes that ensure durability, safety, energy efficiency, and longevity in countless applications. From the silicone sealant around your bathroom tiles to the high-temperature gasket in a jet engine, these materials work under immense pressure—both literal and figurative. Selecting the right sealing solution is not a minor detail; it is a fundamental engineering decision that can determine the success or failure of an entire system. At Kaxite Sealing, we have dedicated decades to mastering the science and application of these critical components.
Kaxite Sealing offers a comprehensive portfolio of sealing solutions, each formulated to meet specific environmental, chemical, and mechanical challenges. Our product development is driven by data, performance standards, and real-world application feedback. Below is a detailed breakdown of our primary product categories and their defining parameters.
Ideal for static sealing applications requiring compression between flanges or surfaces. Available in sheets, rolls, and custom die-cut shapes.
| Material Type | Key Base Polymer | Temperature Range | Pressure Rating | Resistance Profile | Common Standards |
|---|---|---|---|---|---|
| Fluoroelastomer (FKM/Viton®) | Fluorocarbon | -20°C to +230°C | Up to 20 MPa | Excellent resistance to oils, fuels, acids, and ozone. | ASTM D2000, SAE J200 |
| Silicone Rubber (VMQ) | Polysiloxane | -60°C to +230°C | Up to 10 MPa | Superior flexibility at low temps, good weather/UV resistance. | FDA CFR 177.2600, USP Class VI |
| Nitrile Rubber (NBR) | Acrylonitrile Butadiene | -40°C to +120°C | Up to 15 MPa | Excellent resistance to petroleum-based oils and fuels. | ASTM D2000 (BF), NACE MR0175 |
| Expanded PTFE (ePTFE) | Polytetrafluoroethylene | -260°C to +315°C | Varies with density | Nearly universal chemical inertness, creep resistance. | FDA Compliant, ASTM F1545 |
Formulated for sealing seams, joints, and gaps where a dispensed and cured product is required. They can adhere to a wide variety of substrates.
Designed for dynamic sealing applications involving rotating or reciprocating shafts (e.g., pumps, mixers, valves).
| Product Type | Construction | Speed (PV Limit) | Media Compatibility | Surface Finish Recommendation |
|---|---|---|---|---|
| Cartridge Mechanical Seals | Pre-assembled unit with seal faces (SiC, Al2O3, Carbon), springs, and elastomers. | Up to 25 m/s | Wide range: water, chemicals, slurries. | Shaft: 0.4-0.8 µm Ra, Seal Chamber: 1.6-3.2 µm Ra |
| Compression Packing (Braided) | Yarns braided from PTFE, Graphite, Aramid, or Fiberglass. Impregnated with lubricants. | Moderate (Varies by style) | Select based on yarn material. | Shaft: 0.2-0.8 µm Ra. Avoid pitting or scoring. |
Choosing the optimal seal is a multi-variable equation. Here are the key factors our engineers always consider:
Q: What is the main difference between a gasket and a sealant?
A: A gasket is a pre-formed, solid material (like rubber, cork, or metal) cut into a specific shape. It is placed between two flanges and compressed to create a seal. A sealant is typically a liquid or paste applied to a joint that then cures or remains flexible in place. Gaskets are generally used for defined, flat surfaces (flanges), while sealants are used for irregular gaps, seams, or as form-in-place gaskets.
Q: How do I determine the correct hardness (durometer) for an elastomeric seal?
A: Hardness, measured in Shore A, indicates resistance to indentation. Lower numbers (e.g., 50-70 Shore A) are softer and better for sealing uneven surfaces or low-pressure applications. Higher numbers (e.g., 80-90 Shore A) are harder, offering more mechanical strength and resistance to extrusion in high-pressure applications but may require higher bolt load. The Kaxite Sealing engineering team can model the optimal hardness for your specific flange design and pressure.
Q: Can Kaxite Sealing materials withstand outdoor exposure and UV radiation?
A: Yes, but material selection is crucial. Standard nitrile (NBR) or natural rubber degrades quickly outdoors. For long-term outdoor exposure, we recommend materials like EPDM (excellent for weather, ozone, and steam), silicone (good UV and temperature stability), or specifically formulated, UV-stabilized polyurethane sealants. Many of our products carry certifications for prolonged outdoor weathering.
Q: What does "food-grade" or "FDA-compliant" mean for a sealing material?
A: These terms indicate that the formulation complies with specific sections of the U.S. Food and Drug Administration (FDA) regulations, such as CFR Title 21, for repeated or continuous contact with food. The materials must not impart taste or odor and must not transfer harmful substances into the food under intended use conditions. Kaxite Sealing offers a dedicated range of silicone, EPDM, and PTFE products that are FDA-compliant and often also meet NSF/ANSI 51 standards for food equipment.
Q: We have a high-temperature application (above 300°C). What are our best options?
A: For static sealing above 300°C, our primary recommendations are expanded PTFE (ePTFE), which performs well up to 315°C, and high-purity graphite (flexible graphite), which can handle inert atmospheres up to 3000°C but oxidizes in air above 450°C. For sealing compounds, our inorganic ceramic-based sealants are designed for temperatures exceeding 1000°C. For dynamic applications, specially engineered carbon-graphite or silicon carbide mechanical seal faces are necessary. Our technical team can guide you based on the exact atmosphere and thermal cycling involved.
Q: How important is surface preparation before applying a sealant or installing a gasket?
A: Surface preparation is absolutely critical and is often the leading cause of seal failure. All surfaces must be clean, dry, and free of oil, grease, dust, rust, and old sealant residue. For sealants, proper priming might be required on certain substrates (like metals or plastics) to ensure strong adhesion. For gaskets, flange surfaces should be checked for flatness, warping, and scratches. A smooth, uniform surface finish (Ra value) is vital for packing and mechanical seals to prevent leakage and premature wear.
Q: Does Kaxite Sealing offer custom formulations or shapes?
A: Absolutely. While our standard product line covers a vast array of needs, many industrial challenges are unique. Our R&D and manufacturing facilities are equipped to develop custom elastomer compounds with specific property balances (e.g., low-temperature flexibility with high chemical resistance). We also specialize in precision die-cutting, water-jet cutting, and CNC machining of gaskets and seals from customer-supplied drawings or samples, ensuring a perfect fit for your application.
The versatility of modern sealing materials means they are integral to nearly every sector. Kaxite Sealing products are specified by engineers worldwide for their reliability.
0086-574-87527773
No 432 Zhenhai Middle Road, Luotuo Street, Zhenhai District, Ningbo City, Zhejiang China