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How to choose potting sealant for PCB board? What are the advantages and disadvantages of these types of electronic potting sealants?

At present, there are two types of potting sealant for PCB board, which are epoxy resin potting sealant and silicone potting sealant.
Epoxy resin potting sealant:
Advantages: excellent high-temperature resistance and electrical insulation, simple operation, very stable before and after curing, excellent adhesion to a variety of metal substrates and porous substrates.
Scope of application: suitable for potting and sealing of electronic components with no special requirements on environmental mechanical properties under normal temperature.
Silicone potting sealant:
Advantages: strong aging resistance, good weather resistance, excellent impact resistance; Has excellent resistance to cold and hot changes, can be used in a wide range of working temperature, can be in -55 ℃ ~ 180℃ temperature range to maintain elasticity, no cracking; It has excellent electrical performance and insulation ability. After potting and sealing, it can effectively improve the insulation between internal components and lines and improve the use stability of electronic components. It is not corrosive to electronic components and does not produce any by-products in the curing reaction. With excellent repair-ability, it can quickly and conveniently remove the sealed components for repair and replacement; With excellent thermal conductivity and flame retardant ability, effectively improve the heat dissipation ability and safety factor of electronic components; Low viscosity, good fluidity, can penetrate into small voids and components below; It can be cured at room temperature or heated, and has good self-effervescent property and is more convenient to use. Small solidification shrinkage, with excellent waterproof performance and seismic ability.
Disadvantages: poor adhesion, poor confidentiality.
Scope of application: suitable for filling and sealing all kinds of electronic components working in a harsh environment.

In many PCB electronic potting glue, each has its own advantages and disadvantages, how to choose their own electronic potting glue. Of course, it is necessary to first clarify the characteristics and requirements of their products, according to the requirements of their own process, to purchase the right products.

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