Beware of exothermic reaction during a pour.

The polymerization reaction of epoxy resin is exothermic, meaning it releases heat. This heat is significant, as the most reactive systems can reach temperatures above 200 °C. If the temperature rise is too high, deformation or yellowing of the part may occur. To ensure an optimal result, it is necessary to select the hardener reactivity according to the size of your project.

Exothermic behavior depends on several factors:

• The poured mass

• Ambient temperature

• The geometry of the part

• The insulating properties of the container

The most important factor is the mass of the pour. The larger the mixed quantity, the faster the polymerization reaction and the more intense the temperature increase. If a large amount of mixture remains, divide it into several containers to limit the rise in temperature.