Conformal coatings can be defined as polymeric materials which are applied to substrates as film barriers. The films protect electronics from hazardous environmental elements like humidity, corrosion, liquids, and chemicals. The most popular conformal coatings are silicone, urethane, acrylic, parylene, and epoxy.
Epoxy is a coating material popular where abrasion and chemical resistances are crucial. The coating is a protective layer offering excellent barrier properties against moisture and thermal, electrical, and mechanical damage. Epoxy coating attributes are:
• High rigidity
• Superior dielectric strength
• Robust protection layer making it difficult to remove
• Excellent abrasion and chemical resistance
Where is the Epoxy coating applied?
Epoxy conformal coatings are highly resistant to abrasion and are tough, thus making them suitable for harsh environments like the military, marine, automotive, and aerospace industries. There are different epoxy types, which come with varying properties and benefits. For instance, PCBs that give off heat should be protected using thermally conductive epoxies. Epoxies, which are flame retardant, on the other hand, are suitable for protecting against fire hazards, whereas clear epoxies are great, keeping visualization of the circuit boards as needed.
What does it protect against?
Epoxy coatings offer high resistance levels against acids, alkalis, moisture, chemicals, and organic solvents. They are most popular because of their excellent adhesion in substrates without using primers to retain the adhesion needed under various conditions. The reliable electrical characteristics also protect the coating even when humidity levels are high and in areas with elevated temperatures.
How is the application process?
Epoxies are easy to apply using dipping, spray, or brushing techniques. With the dipping method, the protective coating component is immersed into a coating material tank. The immersion and removal need to be precise to achieve an even layer. In the brushing method, the operator uses a manual brush to target specific areas or the entire board. On the other hand, the spraying application method can be manual or automated depending on the production needs. The epoxy materials can be a two-part compound that cures easily or a single compound that requires curing by heat or UV exposure.
Why epoxy for electronic devices?
When determining coating materials suitable for your PCBs, you should weigh the properties of each conformal coating option. Besides ensuring that the coating type you choose meets your requirement, you should also consider scalability, cleaning, masking, inspection, and reworking possibilities. It also helps to be aware of the possible defects and how to avoid or address them.
Epoxy coating has all the properties any electronic device could need in terms of protection. The material has strong barrier properties, is low in cost, and is very easy to apply. It will offer protection to the devices without interfering with their functionality. Even with a few challenges like shrinkage, it is still a good conformal coating, especially with the right processing.
If you are unfamiliar with epoxies, using conformal coating services can make all the difference in the results you get. Professional applicators with experience and expertise in the coating will know the best ways to handle the layer; they can even offer advice on what coating materials are best for your assembly needs.
The product has excellent weather resistance and has good adaptability to natural environment. Excellent electrical insulation performance, can avoid the reaction between components and lines, special water repellent, can prevent components from being affected by moisture and humidity, good heat dissipation ability, can reduce the temperature of electronic components working, and prolong the service life.
This product is a one component heat curing epoxy with good adhesion to a wide range of materials. A classic underfill adhesive with ultra-low viscosity suitable for most underfill applications. The reusable epoxy primer is designed for CSP and BGA applications.
Conductive silver glue products cured with high conductivity, thermal conductivity, high temperature resistance and other high reliability performance. The product is suitable for high-speed dispensing, dispensing good conformability, glue point does not deform, not collapse, not spread; cured material moisture, heat, high and low temperature resistance. 80 ℃ low temperature fast curing, good electrical conductivity and thermal conductivity.
Product Category: Low temperature curing epoxy adhesive
This series is a one-component heat-curing epoxy resin for low temperature curing with good adhesion to a wide range of materials in a very short period of time. Typical applications include memory cards, CCD/CMOS program sets. Particularly suitable for thermosensitive components where low curing temperatures are required.
The product cures at room temperature to a transparent, low shrinkage adhesive layer with excellent impact resistance. When fully cured, the epoxy resin is resistant to most chemicals and solvents and has good dimensional stability over a wide temperature range.
Acrylic glue non-flowing, UV wet dual-cure encapsulation suitable for local circuit board protection. This product is fluorescent under UV(Black). Mainly used for local protection of WLCSP and BGA on circuit boards. Organic silicone is used to protect printed circuit boards and other sensitive electronic components. It is designed to provide environmental protection. The product is typically used from -53°C to 204°C.
The product is a one-component damp-cured reactive polyurethane hot-melt adhesive. Used after heating for a few minutes until molten, with good initial bond strength after cooling for a few minutes at room temperature. And moderate open time, and excellent elongation, fast assembly, and other advantages. Product moisture chemical reaction curing after 24 hours is 100% content solid, and irreversible.
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DeepMaterial
Best epoxy adhesive glue manufacturer in China, our adhesives are widly used in consumer electronic, home appliance, smart phone, laptop and more industries. our R&D team customizes glue products for customers to help customers reduce costs and improve process quality. Glue products are delivered quickly and ensure their environmental friendliness and performance.
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