PCB News - How to choose the three potting glues for PCB circuit boards?

Potting glue, polyurethane potting glue, silicone potting glue, epoxy resin potting glue, polyurethane potting glue, silicone potting glue, epoxy resin potting glue, polyurethane potting glue, Silicone encapsulant, epoxy resin encapsulant, polyurethane encapsulant, silicone encapsulant, epoxy resin encapsulant
At present, there are three commonly used potting glues for PCB circuit boards, polyurethane potting glue, silicone potting glue and epoxy resin potting glue. Xihe will analyze the use of PCB circuit boards in this article, and how to choose these types.

Polyurethane potting glue: The temperature must not exceed 100°C, and it needs to be carried out under vacuum conditions, and bubbles are likely to be generated after potting. The bonding strength is between the epoxy potting compound and the silicone potting compound. The low temperature performance is excellent, and the shockproof performance is the best among the three. However, it is not resistant to high temperatures, has poor toughness, and the surface is not smooth after curing, and its chemical resistance is average. It is suitable for electronic components and indoor appliances with low heat generation.
Silicone potting glue: impact resistance, aging resistance, good physical resistance. It can maintain its performance in hot and cold environments. Good electrical performance and insulation performance, easy to repair. Silicone potting glue has low viscosity, good fluidity and easy potting. And can effectively improve the safety factor and heat dissipation of the components. But the adhesion is relatively poor, the confidentiality is not good enough, and the price is high. Suitable for electronic components that work in harsh environments for a long time.
Epoxy resin potting glue: high temperature resistance, excellent electrical insulation, stable before and after curing, excellent adhesion to a variety of metals and porous substrates, and simple operation. Insufficient cold resistance, not suitable for low temperature environments, cracks are prone to occur after cold and heat shocks, which may lead to device damage. The cured epoxy resin potting glue has insufficient toughness, high hardness and brittleness. It is suitable for electronic components under normal temperature environment, and does not have too many requirements for environmental mechanics.
Each of the commonly used potting adhesives for PCB circuit boards has different properties, advantages and disadvantages. Choose the appropriate one for operation, do not blindly choose and use, and choose according to the construction process and device requirements.