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Epoxy resin exotherm

Exotherm is heat released during curing. It may be invisible in a small sample, but in a large mass it can destroy the casting and mould.

TDS and safety

exotherm heat mass pour

In this guide

Quick answer How to approach it in practice Step by step Common mistakes Internal links FAQ

Quick answer

Epoxy resin exotherm

Exotherm is heat released during curing. It may be invisible in a small sample, but in a large mass it can destroy the casting and mould.

Technical parameters decide whether a project runs calmly or ends with stickiness, overheating or bubbles.

Read the TDS as a process guide: ratio, temperature, mass, working time, layer thickness and full cure are connected.

How to choose

Do not leave a large portion of mixed resin in the cup.
Match the system to pour thickness and workshop temperature.
Avoid pigments and additives not approved for large pours.

Why the cup heats up

A large mass in a narrow container releases heat slower than a thin layer in a mould.

What can go wrong

Overheating can cause bubbles, yellowing, cracks, shrinkage and deformation.

Risk reduction

Work within recommended temperature, split large pours and follow the TDS.

How to approach it in practice

Step by step

01

Start with system limits

First check the thickness and mass the resin is designed for. Product naming does not replace technical data.

02

Compare parameters under the same conditions

Pot life, gel time and curing depend on temperature and sample mass. Comparisons without conditions can mislead.

03

Plan pouring and degassing

Large volumes need time for mixing, pouring, degassing and leak control. Short pot life can be a real limitation.

04

Record technical decisions

Note ratio, temperature, batch, pigment and pour time. If a defect appears, you have data to learn from.

05

Split the project when needed

If layer, mass or temperature exceeds the system comfort zone, staging is safer than fighting exotherm.

Common mistakes

Mistake 1

Confusing pot life with full cure time.

Mistake 2

Mixing weight ratio with volume ratio.

Mistake 3

Ignoring workshop, wood and A+B component temperature.

Mistake 4

Too much resin mass in the cup or mould despite TDS warnings.

Internal links

LimitMaximum resin layer thicknessPour thickness and mass Working timeWhat is pot lifeWhy the cup speeds up RepairEpoxy resin defectsOverheating symptoms TDS and safetyHow to choose resin for a river tableHow to choose epoxy resin for a river table: pour depth, pot life, exotherm, clarity, UV stability, degassing and wood preparation. TDS and safetyHow to read a resin TDSHow to read an epoxy resin technical data sheet: mixing ratio, pot life, cure time, maximum layer thickness and working conditions. TDS and safetyEpoxy resin curing timeEpoxy resin curing time: the difference between gel, dust-free stage, machining time and full mechanical resistance. StudioResin databaseExtract parameters from technical data sheets ProductsResin databaseCompare TDS data and pour limits ToolResin calculatorMatch volume with product parameters

Read next

TDS and safetyHow to choose resin for a river tableHow to choose epoxy resin for a river table: pour depth, pot life, exotherm, clarity, UV stability, degassing and wood preparation. TDS and safetyHow to read a resin TDSHow to read an epoxy resin technical data sheet: mixing ratio, pot life, cure time, maximum layer thickness and working conditions. TDS and safetyWhat is pot lifeEpoxy resin pot life: what working time means, what affects it and why it is not the same as curing time. TDS and safetyEpoxy resin curing timeEpoxy resin curing time: the difference between gel, dust-free stage, machining time and full mechanical resistance. TDS and safetyMaximum epoxy resin layer thicknessMaximum epoxy resin layer thickness: why the TDS sets a pour limit, what happens when the pour is too thick and when to split casting into stages. StudioResin databaseExtract parameters from technical data sheets ProductsResin databaseCompare TDS data and pour limits ToolResin calculatorMatch volume with product parameters

Next step

Turn TDS into project data

Use the resin database to compare ratios, layer limits and working times before choosing a system.

Open resin database

FAQ

Does every epoxy heat up?

Yes, but the scale depends on system, mass, temperature and pour geometry.

Why did resin boil in the cup?

Usually because of too much mass, high temperature or a fast system left in the container.

Does deep-pour resin eliminate exotherm?

No. It reduces risk for thicker pours, but still has TDS limits.