Understanding Epoxy Resin Mixing Ratios

What Are Epoxy Resin Mixing Ratios?

Epoxy resins are typically supplied as two components: resin (part A) and hardener (part B). The mixing ratio refers to the proportion in which you combine these components, as recommended by the manufacturer. Common ratios include 2:1 (two parts resin to one part hardener) or 3:2, but some specialised products vary. Using the correct ratio is critical—too much or too little hardener can affect the curing process and the final appearance.

How to Measure and Mix Resin Correctly

• Check the product label or instructions for the precise ratio—this is not the same for every resin. For example, “Trasparente” epoxy resin uses a specific mix suited for up to 2cm layers.
• Use clean, dry measuring containers and mix by volume unless the manufacturer specifies by weight.
• Combine resin and hardener, mix thoroughly for several minutes, scraping the sides and bottom to ensure a uniform blend.
• Avoid estimating—precise measurement ensures your resin cures clear and strong.

When Mixing Ratios Matter Most

Mixing ratios are particularly crucial when clarity and hardness are important, such as in casting jewellery, coasters, or tabletop projects. Incorrect ratios may cause cloudiness, stickiness, or softness, leading to wasted materials and disappointing results. For decorative finishes, like those achieved with “Art Pro” resin, accuracy becomes especially important to secure a glass-like finish.