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Managing heat during resin curing is crucial for ensuring a successful cast. A low exothermic reaction means the resin produces less heat as it cures, which greatly reduces the risk of overheating or deformation—especially in larger or deeper applications.
What Is a Low Exothermic Reaction?
When resin and hardener are mixed, the chemical reaction releases heat, known as an exothermic reaction. In high-volume or deep-pour applications, this heat can accumulate quickly. Resins formulated for a low exothermic reaction are specifically designed to minimise the energy—and therefore the temperature—produced as they cure, which helps keep the process stable and the result predictable.
Why Is It Important for Deep Pour and Large Casts?
In deep resin pours or casts exceeding several centimetres in thickness, excess heat can cause warping, yellowing, cracking, or even produce a hazardous situation. A resin such as EpoxyTable 5-Five is formulated to handle castings up to 5cm thick, specifically by keeping the exotherm low—this makes it ideal for resin tables and other large pieces. For super-deep applications up to 10cm, Epoxytable 10-Ten offers similar benefits on a larger scale.
Practical Tips for Safe Pouring
- Always follow the recommended maximum pour depth for your chosen resin to prevent overheating.
- For very large or thick pours, consider working in several layers, allowing each to cool before adding more.
- Ensure your workspace is at a stable room temperature to maintain consistent curing conditions.
When This Matters
The risk of overheating increases most when working with large volumes, deep pours, or moulds that limit heat dissipation. Using a low exothermic resin is especially important for river tables, thick jewellery, and other projects where clarity and structural integrity are priorities.
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Selecting a low exothermic resin is a key step for anyone working on large or thick-cast projects and wanting to avoid heat-related problems. For more guidance on material compatibility and mixing techniques, return to our main page on mixing resins from different suppliers.