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When working with epoxy resin, the heat generated during curing—known as an exothermic reaction—plays a crucial role, especially for large or deep castings. Using a low exothermic resin helps manage this heat, reducing risks and producing better results for thick projects.
What Are Low Exothermic Reactions?
An exothermic reaction is the release of heat when resin and hardener are mixed. Epoxies designed for low exothermic reactions generate less heat during curing. This moderation is vital if you’re pouring layers greater than a few centimetres thick, as excessive heat can lead to cracking, distortion, or yellowing in the finished piece.
Practical Tips for Safe Deep Pour Projects
- Use specialised low-exotherm products like EpoxyTable 5-Five for castings up to 5cm thick, or “Epoxytable 10-Ten” for even deeper pours up to 10cm.
- For extra-large or thick castings, it is often best to work in layers, allowing each to set before pouring the next. This helps keep heat build-up under control.
- Always follow the manufacturer’s recommended mixing ratio and pour thickness to avoid overheating and deformations.
When Low Exothermic Resins Matter Most
Low exothermic epoxies are essential for artists, furniture makers, and DIYers working on projects like river tables, countertops, or artistic castings, particularly when dimensions exceed a few centimetres in thickness or width. Choosing the right resin makes the process safer and results more reliable.
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Selecting a low exothermic reaction resin is a key consideration in calculating the amount and type of epoxy needed for your project. For more tips on resin quantities and casting advice, visit our main guide on calculating epoxy resin amounts.