silicone conformal coating 相關
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搜尋結果
「三防漆 (Conformal Coating)」 又稱「三防膠」是一種塗布在印刷電路板上以形成保護膜的一種方法，這層保護膜通常僅是薄薄的一層約25～300µm微米厚度，它 可以用來加強電子產品的 防潮 、 防污 、 防塵 、 防化學污染 的能力，也可以防止焊點及導體與空氣接觸而繼續 腐蝕 的問題，加入某些成分後也可以起到屏蔽及消除某些電磁干擾，更可以起到絕緣的作用。 既然三防膠 (conformal coating)可以阻隔空氣與焊點的接觸起到防潮的作用，所以它也可以間接的防止「錫鬚 (tin whisker)」及「電子化學遷移 (electrochemical migration, EMC)」的生長。
2021年1月5日 · Key Takeaways. Silicone conformal coatings function in the same way as other conformal coating types—protecting electronic components and PCBs from damage. Silicone conformal coatings are unique because they are useful for flexible PCBs and high-temperature applications that most other coating types cannot withstand.
- Cadence PCB Solutions
CHT’s silicone conformal coatings are popularly used in PCB electronic applications because they adhere well to most components and substrates, maintain physical properties in extreme temperatures, are contaminant & corrosion resistant, and flow easily around components.
- Conformal Coating Types
- Acrylic-Based Coatings
- Silicone-Based Coatings
- Polyurethane-Based Coatings
- Epoxy-Based Coatings
- Parylene-Based Coatings
- Conformal Coating Considerations
- Designing For Conformal Coating
- Conclusion
Every kind of coating has unique properties and characteristics suitable for specific applications. Here we look at the market's five main conformal coating types: Acrylic, Silicone, Polyurethane, Epoxy, and Parylene-based.
The main characteristics of Acrylic-based conformal coatings are their low cost and ease of application making them ideal for hobby electronics. You can apply this coating using various techniques, including dipping, spraying, or brushing. They are also simple to remove using a non-aggressive solvent like isopropanol if the circuit board needs to b...
The main characteristics of Silicone-based conformal coatings are their retained elasticity following curing, which offers good protection against the effects of vibrations and high mechanical stress levels on circuit boards. In addition, silicone provides excellent resistance against moisture and corrosion and good resistance to chemical contamina...
The main characteristics of Polyurethane, or urethane, conformal coatings are their toughness, adhesion, and strong resistance to solvents and other chemical contamination. Consequently, this material protects circuit boards exposed to harsh environments. The US Food and Drug Administration(FDA) has also approved Polyurethane for medical devices. T...
Epoxy-based conformal coatings produce a tough and smooth finish resistant to chipping or cracking, providing good protection against abrasion and moisture ingress. The key benefit of acrylic resins is their protection against chemical contamination, including solvents, which are ideal for use in harsh industrial environments. One downside to this ...
The main characteristics of Parylene-based conformal coatings are their low thermal expansion and high dielectric strength for specialist applications. In addition, it offers good resistance to chemical contamination and abrasion over reasonable temperature ranges. The US FDA approves this coating for use in medical applications. The main downside ...
Thermal Properties The primary consideration when choosing the suitable conformal coating material is the worst-case operating temperature of the circuit board. The maximum temperature can limit which conformal materials are ideal for use or require reconsidering thermal management strategy to reduce temperatures to the acceptable range of the pref...
Including the conformal coating specification as part of the electrical design of the circuit board offers benefits when it comes to managing the manufacturing process. Tools such as Altium Designer allow the specification of the conformal coating to be an integral part of the circuit board design. This feature allows you to share the details with ...
Applying a conformal coating to your circuit board is essential to protect your device from its operating environment, reducing failure rates and prolonging its working life. However, choosing the most suitable coating material requires balancing the protective properties of each type against your needs and the practicalities of application. For ex...
Learn about Momentive's conformal coatings materials, including ECC3011 and ECC3051S silicone conformal coatings, and how they can prevent corrosion on PCB components and surfaces.
2020年9月27日 · Coatings can also be removed with the right solvent, or they can be peeled away (e.g., silicone-based coatings) if needed for rework or repair. The table below shows the popular PCB conformal coating types, their advantages, and their disadvantages.
Silicone conformal coatings have emerged as a popular protective coating for PCBs due to their ability to repel water, provide insulation, and withstand wide temperature variations. This article provides an in-depth look into silicone conformal coatings, their properties, application methods, selection criteria, and benefits for PCB protection.
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