Understanding how much resin is required for impregnating carbon fibre is crucial for makers, engineers, and composite fabricators. This page compares leading epoxy resins by ResinPro, explains recommended resin-to-fibre ratios, and details which product suits each project—so you can select with confidence.

Comparing Resins: What is the Ideal Amount for Carbon Fibre?

When working with carbon fibre, using the right quantity of resin ensures optimal impregnation, strength, and finish. Typically, for each 100g of carbon fibre, you will require between 70g and 110g of mixed resin depending on the weave, application technique, and desired finish. The mixing ratio between resin and hardener varies by product, typically ranging from 100:55 to 100:60 by weight.

Key differences between popular ResinPro options include their mixing ratios, clarity, specialised features, and suitability for certain types of composite work. Let’s compare their core strengths for carbon fibre applications below.

The Importance of Proper Resin Impregnation

Thorough resin impregnation is vital for ensuring structural stability in carbon fibre composites. Using the recommended ratio reduces risks of dry patches or excessive resin that can impact strength and finish. Always work methodically, allowing resin to thoroughly saturate fibres for optimal results.

“Carbon Resin” – Epoxy Resin for Carbon Fiber & Fiberglass Coating

“Carbon Resin” – Epoxy Resin for Carbon Fiber & Fiberglass Coating is formulated specifically for composite technicians and model makers using technical fabrics. It ensures perfect impregnation with high impact resistance and a glossy, professional finish. The recommended mixing ratio is 100g resin (Component A) to 55g hardener (Component B) by weight, so for every 100g of carbon fibre, aim for about 100g of mixed resin (approximately 65g Component A, 35g Component B). This is ideal when structural integrity is your priority.

“Trasparente” Epoxy Resin Kit 800g + Mica Powder 10g – 10 Colour Variations

The “Trasparente” Epoxy Resin Kit offers a versatile solution for surface restoration, art projects, and fabric impregnation, including carbon fibre. The mixing ratio for this kit is 100g resin to 60g hardener by weight. For every 100g of carbon fibre, use about 90g to 110g of mixed resin depending on surface texture and absorption. This kit stands out for its high transparency and is supplied with gloves, sticks, and pigment for creative applications.

“Trasparente” – Multipurpose Clear Epoxy Resin for Casting – Up to 2cm

“Trasparente” – Multipurpose Clear Epoxy Resin for Casting – Up to 2cm is perfect for detailed composite work and art castings on carbon fibre up to 2 cm thickness. Use the 100:60 ratio by weight as with the kit version, adjusting total resin upwards for denser fibre layups. Its ultra-clear formula and integrated UV filter make it suitable for projects where clarity and appearance matter.

“EpoxyTable 5-Five” – Deep Pour Epoxy Resin for Tables and Large Projects – Up to 5cm

The “EpoxyTable 5-Five” – Deep Pour Epoxy Resin is built for larger carbon fibre applications and thick castings up to 5 cm. It features a 100:55 resin-to-hardener mix, like “Carbon Resin”. Allow for about 100–115g of mixed resin per 100g of carbon fibre when working with thicker layups, large pours, or coarser textures. The product’s low exothermic reaction supports large-scale composite projects where careful processing and heat management are vital.

Tips for Best Results: Resin Ratios and Project Types

Choosing the correct amount of resin is only part of the equation. For fine weave carbon fibre, less resin is required; coarse or layered fabrics need more. Always mix resin and hardener by weight for precise ratios. Pour slowly to minimise bubbles and ensure even distribution. Testing on sample pieces is recommended before full-scale work.

Testing and Adjusting Resin Quantities

Begin with a small test piece to confirm the resin-to-fibre ratio suits your fabric type. Adjust up or down by 5–10% as needed. Observing how the resin spreads and bonds will help fine-tune the amount for your main project, avoiding waste and enhancing performance.