Avoid Thick Pours Over Heat-Sensitive Components

Why Thick Pours Are Problematic

Epoxy resins typically generate heat while curing—a process called exothermic reaction. Thicker resin layers mean greater heat, which can adversely affect sensitive electronic parts, melting plastic housings, loosening solder joints, or degrading critical chips. This is especially problematic with modern circuit boards featuring surface-mount devices or temperature-sensitive elements.

Safer Encapsulation Techniques

• Apply Resin in Layers: For best results, pour thin layers (a few millimetres) and allow each to partially cure before adding the next. This approach minimises heat build-up and reduces the risk of component damage.
• Choose Low-Exotherm Formulations: Select resins formulated for deep pours, such as EpoxyTable 5-Five, as these are engineered to generate less heat even at higher thicknesses. Always refer to the manufacturer’s maximum recommended depth per pour.
• Monitor Temperatures: Work in a well-ventilated, temperature-controlled environment and consider using a non-contact thermometer to check the surface temperature while curing.

When Thick Pours Matter

Avoiding thick epoxy pours is particularly critical for prototypes, custom hardware, or repairs involving parts like sensors, microcontrollers, or batteries. Even a single overheated component can compromise the entire project.