Epoxy Resin Calculator — Composites
Composite laminating calculator
Estimate the theoretical amount of epoxy mixture and the thickness of your laminate from the reinforcement and layup method.
Your estimate
Resin + hardener mixture
Resin mass
Hardener mass
Estimated thickness
The resin and hardener split depends on the INFUPOXY hardener chosen (Fast or Slow).
Calculation details
- Area
- Area across all plies
- Fibre mass
- Fibre volume
- Epoxy volume
- Theoretical composite mass
Raw estimates, without a margin. The quantities shown do not include losses during preparation and application.
Recommended system
INFUPOXY
Contact Sicomin for advice on the INFUPOXY hardener suitable for your project.
Choose your hardener
Consider the temperature, available working time and your project when choosing the hardener.
Your packaging
Recommended combination
Commercial quantity
Packaging surplus
Total price
Your project requires a significant amount of resin. Please contact our team to discuss suitable packaging and pricing.
Contact usAdditional products
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How do you calculate resin for composite laminating?
The surface, reinforcement weight and number of plies determine the fibre mass. The fibre density converts that mass to volume. The fibre volume fraction for the selected process determines the theoretical epoxy volume.
How much resin for each process?
At an equal fibre mass, the reference fibre fractions are 35% for hand layup, 45% for vacuum bagging and 55% for infusion. A higher fibre fraction leaves less volume for epoxy. These are theoretical values without a loss allowance.
How thick will the laminate be?
Theoretical thickness follows from the reinforcement weight, number of plies, fibre density and fibre volume fraction. Actual thickness also depends on compaction and the reinforcement used.
Composite calculator FAQ
How much resin is needed for composite laminating?
Area, reinforcement weight, ply count, fibre density and processing method determine the theoretical epoxy requirement. Fibre mass and volume are calculated first, then resin volume follows from the reference fibre volume fraction. No allowance for losses is included.
How do hand layup, vacuum bagging and infusion differ?
This calculator assumes fibre volume fractions of 35% for hand layup, 45% for vacuum bagging and 55% for infusion. For an identical reinforcement, a higher fraction leaves less volume for epoxy and reduces theoretical thickness.
How is laminate thickness estimated?
Thickness depends on reinforcement weight, ply count, fibre density and the fibre fraction achieved by the process. Actual thickness may vary with compaction and the reinforcement.
How does fabric weight affect resin quantity?
A heavier fabric adds more fibre per square metre. Fibre volume and the theoretical epoxy needed both change; fibre type, ply count and process also matter.
Which epoxy system is suitable for laminating?
For hand layup or vacuum bagging this calculator suggests STRATPOXY PLUS for structural repair, GLASSPOXY for translucent laminating and STRATPOXY for marine repair. Infusion suggests INFUPOXY. Select a compatible hardener for the actual working conditions.