Gasket Manufacturing Frequently Asked Questions
If you have questions about the gasket manufacturing process, we have answers. At KraFAB, we’re here to guide you through every step of the process, ensuring you have the information you need to make informed decisions.
Whether you’re curious about the differences between gasket materials, our methods to create custom gaskets, or specific applications like EMI shielding and thermal interface materials, our comprehensive FAQ page covers it all.
1. How are custom gaskets made?
We begin the process by getting a full understanding of the specific requirements of the application. We evaluate factors like temperature, pressure, chemical exposure, and environmental conditions.
Using this information, we select the appropriate materials and design the gasket to fit precisely within the intended assembly.
Advanced techniques such as die-cutting, waterjet cutting, or laser cutting are employed to shape the gasket. For form-in-place gaskets, a liquid or paste material is applied directly onto the part where it cures in place, forming an exact seal.
2. What is the difference between a seal and a gasket?
A gasket is a mechanical seal that fills the space between two or more mating surfaces, preventing leakage from or into the joined objects while under compression. A seal, on the other hand, can be more broadly defined and includes any material or device used to prevent the passage of fluids or contaminants. While gaskets are typically static (non-moving), seals can be dynamic (moving parts) or static.
3. What material makes the best gasket?
The best gasket material depends on the application. Common materials include rubber, silicone, neoprene, PTFE (Teflon), and EPDM. For high-temperature applications, materials like silicone or PTFE are preferred. For chemical resistance, PTFE and Viton are ideal. In environments with electrical interference, EMI gaskets made from conductive materials are used. Therefore, the “best” material is one that meets the specific requirements of the intended use.
4. Is a neoprene gasket better than a rubber gasket?
Neoprene, a type of synthetic rubber, offers several advantages over natural rubber, such as better resistance to oil, chemicals, and weathering. However, the choice between neoprene and natural rubber depends on the application.
Neoprene is superior for outdoor or chemical-exposed environments, while natural rubber may be adequate for more general purposes and offers better resilience and flexibility.
5. What is the difference between a preformed gasket and a form-in-place gasket?
Preformed gaskets are manufactured separately in a specific shape and then fitted into the assembly. They are ideal for applications where consistency and easy installation are required. Form-in-place (FIP) gaskets, on the other hand, involve applying a liquid or paste sealant directly onto the assembly surface, where it cures and forms a gasket. This method is beneficial for complex or irregular shapes and provides a highly precise seal.
6. Which is better: PTFE or EPDM gaskets?
The choice between PTFE and EPDM gaskets depends on the application requirements. PTFE (Teflon) gaskets offer excellent chemical resistance, high-temperature tolerance, and low friction, making them ideal for aggressive chemical environments and high-heat applications. EPDM (ethylene propylene diene monomer) gaskets provide superior resistance to weathering, ozone, and water, making them suitable for outdoor and water-related applications.
7. What material is good for EMI shielding?
Materials used for EMI (electromagnetic interference) shielding typically include metals like aluminum, copper, and nickel. Conductive elastomers, metalized fabrics, and conductive coatings are also used to provide effective EMI shielding. These materials block or absorb electromagnetic waves, preventing them from interfering with electronic devices and systems.
8. What material can block RF?
To block radio frequency (RF) signals, materials such as copper, aluminum, and certain steel alloys are commonly used. These materials are effective because they reflect and absorb RF waves, preventing them from penetrating through the shielded area. Specialized RF shielding materials like conductive fabrics and paints can be used in some applications.
9. Is laser cutting cheaper than CNC?
The cost-effectiveness of laser cutting versus CNC (computer numerical control) machining depends on the material, complexity of the design, and production volume. Laser cutting is generally more efficient and cost-effective for thin materials and intricate designs due to its precision and speed. CNC machining is better suited for thicker materials and three-dimensional shaping. Overall, laser cutting may be cheaper for specific applications, but a thorough cost analysis is necessary to determine the best option.
10. What is a die cut seal?
A die-cut seal is a seal created using a die-cutting process, where a pre-designed shape is cut out from a sheet of material using a die. This method allows for precise, repeatable production of seals in various shapes and sizes, ensuring a consistent fit and reliable sealing performance in the intended application.
11. What is a die cut gasket?
A die-cut gasket is produced by cutting a specific shape from a sheet of gasket material using a die. This process allows for high precision and consistency, making it ideal for mass production. Die-cut gaskets are used in various industries to provide reliable seals in machinery, automotive, aerospace, and other applications where exact dimensions are crucial.
12. What is the purpose of die cutting?
Die cutting is a manufacturing process used to cut, shape, and form materials into precise, consistent shapes. It is widely used for creating gaskets, seals, labels, and various other components. The purpose of die cutting is to achieve high accuracy, repeatability, and efficiency in producing parts that fit specific design requirements, ensuring reliable performance in their intended applications.
13. What are thermal interface materials in electronic packaging?
Thermal interface materials (TIMs) are used in electronic packaging to enhance the thermal connection between heat-generating components and heat sinks or spreaders. These materials improve the efficiency of heat transfer, helping to manage and dissipate heat effectively. TIMs are critical in preventing overheating and ensuring the longevity and performance of electronic devices.
14. What is TIM made of?
TIMs can be made from various materials, including thermal greases, adhesives, pads, phase change materials, and gap fillers. These materials typically consist of a base polymer or silicone matrix filled with conductive particles such as ceramics, metal oxides, or graphite to enhance thermal conductivity.
15. What are examples of phase change materials?
Examples of phase change materials (PCMs) include paraffin wax, salt hydrates, fatty acids, and eutectic salts. These materials absorb and release heat as they change from solid to liquid and vice versa, making them useful for thermal management applications in electronics, building materials, and textiles.
16. What is the cheapest phase change material?
Paraffin wax is one of the most cost-effective phase change materials. It is widely available, has a suitable melting point for many applications, and offers reliable thermal energy storage and release properties, making it a popular choice for cost-sensitive thermal management solutions.
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At KraFAB, we’re dedicated to providing you with the highest quality gaskets, adhesives, die-cutting solutions, EMI shielding, and thermal interface materials. Our expertise and state-of-the-art technology ensure that your specific needs are met with precision and reliability.
Whether you have questions about our manufacturing process, material selection, or need a custom solution contact us directly to discuss your project requirements.
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