Understanding Low Exothermic Reaction in Resin

What Is a Low Exothermic Reaction?

When resin cures, it releases heat—a process called an exothermic reaction. Some resins are designed to generate less heat during curing, known as having a low exothermic reaction. This is particularly important in large or deep resin pours, as excessive heat can cause warping, bubble formation, or even deformation in your piece. A resin formulated for low exothermic reaction enables safe casting of thick layers, offering greater control and minimising the risk of damage.

Practical Guidance for Deep Pour Projects

For large castings or resin tables up to 10cm thick, opt for a specialist product like the Epoxytable 10-Ten Deep Pour Epoxy. Its formulation prevents overheating and allows air bubbles to escape easily, resulting in a clear, even finish. Always follow the manufacturer’s recommended casting thickness and consider pouring in stages for projects near the maximum depth. Working in a well-ventilated area and avoiding direct sunlight during curing also helps maintain temperature stability and prevents yellowing.

When Low Exothermic Reaction Matters Most

• Pouring thick layers (e.g. tabletops, river tables, large sculptures)
• Working in bulk or on projects where temperature control is difficult
• Reducing risk of cracks or cloudiness in clear resin works