SEO calculator / mixing

Epoxy resin mixing calculator

Calculate component A and B for an epoxy mix, add allowance and split a large batch into safer smaller pours.

Input data

Enter workshop assumptions. The result is recalculated locally in your browser.

A+B total before pigment.
First number from the TDS, e.g. 100.
Second number from the TDS, e.g. 45.
Cup residue and process losses.
Limit the mass of one mix.

Why do smaller batches matter?

A large epoxy mass in one cup heats up faster and shortens real working time. Splitting the mix is safer than fighting a gelling batch.

Can the ratio be rounded?

It is better not to. In small batches, a few grams can affect curing. Weigh components if the TDS gives a weight ratio.

What about pigment?

Calculate pigment separately as a percentage of the A+B mix unless the pigment technical sheet says otherwise.

What should be saved with the project?

Save ratio, batch size, room temperature and start time. Those notes matter more than photos when you repeat a colour or diagnose a defect later.

Related pages

LinkEpoxy resin ratio calculatorFast A+B ratio split. LinkWhat is pot lifeWorking time in practice. LinkResin databaseCompare product ratios and technical parameters.

FAQ

Is a 100:45 ratio by weight?

Usually, but always check the TDS. Never assume that a weight ratio is also a volume ratio.

Can I mix the whole mass at once?

Only if the mass and pot life fit the TDS. For larger projects, split the resin into batches.

Should allowance be added to A and B?

Yes. Add allowance to the whole mix first, then split it according to the A:B ratio.