Understanding Epoxy Resin Ratios and Their Impact on Your Projects

When you step into the world of epoxy resin, the mixing ratios you encounter can seem intimidating at first. However, whether you are a seasoned artist or just starting out, grasping these ratios is crucial for getting the best results in your creations. Ratios like 1:1, 2:1, and 3:1 are not just numbers; they play a vital role in determining curing time, durability, and how you apply the resin. In this post, we will break down these differences to help you select the right resin for your next project.

What Are Epoxy Resin Ratios?

Epoxy resin includes two main components: resin and hardener. The mixing ratio tells you how much of each you need to mix to initiate the curing process. For instance, a 1:1 ratio involves equal measures of resin and hardener, while a 2:1 ratio requires two parts resin for every one part hardener.

These ratios matter because they influence important characteristics of the finished product, such as strength, flexibility, and clarity.

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1:1 Ratio (820)

• Mixing: Equal parts resin (A) and hardener (B) by volume.

• Working Time: 1–2 hours

• Curing Time: 8–24 hours

• Thickness: Best for 2–3 cm layers.

• Reference Temperature: 25°C

• Best For: Trinkets, keychains, coasters, decorative ornaments.

• Feature: Easy to use, beginner-friendly, slightly less hard than higher ratios.

This ratio is ideal for most DIY and craft projects. Since it’s forgiving and easy to measure, it’s a popular choice for beginners.

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2:1 Ratio – Fast Curing

• Mixing:

  • By weight 2 parts resin to 1 part hardener

  • By volume 1.7 parts resin to 1 part hardner

• Working Time: ~10 minutes

• Curing Time: Around 40 minutes

• Thickness: Around 2 cm layers.

• Reference Temperature: 18°C

• Best For: Small items that need to be ready quickly.

• Feature: Very fast curing — requires quick, precise work.

This is perfect when you want speed — like making small pendants or prototypes — but it’s less forgiving for beginners due to short working time.

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2:1 Ratio – Slow Curing

• Mixing:

  • By weight 2 parts resin to 1 part hardener

  • By volume 1.7 parts resin to 1 part hardner

• Working Time: 1–2 hours

• Curing Time: 24–48 hours

• Thickness: 2–4 cm layers.

• Reference Temperature: 18°C

• Best For: Large, thicker artworks like river tables or canvas pours.

• Feature: Allows more time to work and remove bubbles, but needs patience for curing.

This type is loved by professionals for big projects — the slower cure reduces the risk of overheating and cracking in thicker pours.

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3:1 Ratio (806)

• Mixing:

  • By weight 3 parts resin to 1 part hardener

  • By volume 2.5 parts resin to 1 part hardner

• Working Time: 1–2 hours

• Curing Time: 24–48 hours

• Thickness: Up to 5 cm layers.

• Reference Temperature: 25°C

• Best For: 3D artworks like casting molds, ashtrays, tables, and display pieces.

• Feature: Easy to operate, harder finish than 1:1 resin.

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This is a great middle ground — easy enough to handle, yet produces a harder, more durable finish than a 1:1 mix.

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UV Resin

• Mixing: No mixing required — cures under UV light.

• Working Time: 1–2 minutes before UV exposure

• Curing Time: 2–10 minutes with UV light

• Thickness: Around 5 mm per layer.

• Reference Temperature: UV lamp lighting

• Best For: Small jewelry pieces like earrings, hairpins, or water drop pendants.

• Feature: High hardness, very fast curing, perfect for quick projects.

If you’re making small, clear jewelry and want instant results, UV resin is unbeatable.

Choosing the Right Ratio for Your Project

Selecting the best epoxy resin for your needs involves thoughtful consideration. Reflect on these factors:

1. Project Type: Are you crafting a delicate piece of jewelry or a sturdy tabletop?

2. Curing Time: Do you need the resin to harden quickly, or is there flexibility in timing?

3. Strength Requirements: Will your item bear weight or endure stress?

4. User Experience: Are you just starting, or do you have some familiarity with resin crafting?

By addressing these questions, you can more easily identify which mixing ratio complements your project. Here's our suggestion.

1. For beginners: 1:1 ratio — simple, versatile, and easy to measure.

2. For urgent projects: 2:1 fast curing — just be ready to work quickly.

3. For large pours: 2:1 slow curing — more working time, better for thick layers.

4. For durability & larger layers: 3:1 ratio — strong and clear finish.

5. For instant results: UV resin — no mixing, cures in minutes.

Tips for Working with Epoxy Resin

• Measure Accurately: Use a digital scale or calibrated measuring cups for precision.

• Mix Thoroughly: After combining the resin and hardener, stir for a minimum of 3-5 minutes. Incomplete mixing can lead to poor results.

• Work in a Well-Ventilated Area: Ensure adequate airflow as epoxy can emit strong fumes.

• Follow Manufacturer Instructions: Each resin has specific guidelines; always check the packaging or product data sheet.

  
  

Final Thoughts

Grasping the differences in epoxy resin ratios can significantly affect your project's outcome. Whether you opt for a 1:1, 2:1, or 3:1 ratio, or choose something unique like UV resin, understanding how these ratios impact curing time and strength will empower you to make informed decisions.

Take your project's requirements into account and apply best practices for working with resin. With careful consideration, you can create beautiful, durable pieces that exceed your expectations. Happy crafting!