Low Exothermic Reaction to Avoid Overheating in Large Pours

Understanding Exothermic Reactions in Resin

When epoxy resin cures, it produces heat through an exothermic reaction. In small or thin layers, this heat escapes quickly. But with large or thick pours, the heat can build up rapidly and cause issues such as cracking, yellowing, or even deformation of the project and formwork. Choosing a resin specifically formulated for low exothermic reaction helps keep temperatures manageable, even in deep pours.

Choosing the Right Resin for Large Pours

For projects involving thick layers or substantial resin volumes (for instance, casting up to 10cm), opt for specialist products like the Epoxytable 10-Ten – Deep Pour Epoxy Resin. This type of resin is formulated for slow, controlled curing and reduced exothermic output, making it suitable for large pieces. If your pour exceeds weight or area recommendations, it is best to work in multiple layers, allowing heat to dissipate between pours. Accurate measuring tools, such as a graduated dosing cup, also help ensure you don’t exceed safe thickness per layer.

Tips for Safer, More Reliable Results

• Always check manufacturer advice for maximum individual pour thickness.
• Allow each layer to cool fully before adding the next.
• Work in a well-ventilated area to assist in temperature regulation.
• If possible, pour at lower room temperatures for greater control.