Jesmonite AC100 Calculating how much Jesmonite you need for your Mould

Introduction

In this tutorial, you will learn how to accurately calculate the amount of Jesmonite AC100 you need for your silicone moulds. This method simplifies the process of measuring and ensures you have the right proportions for your projects. Whether you're creating a trinket tray or any other flat mould, these steps will guide you through the calculation and mixing process.

Step 1: Gather Your Materials

Before you begin, make sure you have the following items ready:

• Jesmonite AC100 liquid
• Jesmonite AC100 powder
• Weighing scales
• A plastic bucket
• A jug (optional for larger moulds)
• A silicone whisk or mixing tool

Step 2: Fill Your Mould with Water

• Place your silicone mould inside the plastic bucket to prevent water from getting on your scales.
• Gradually fill the mould with water until it is completely full.
• If you have a larger mould that cannot fit on the scales, use a jug to pour water into the mould and weigh the jug before and after to determine the amount of water used.

Step 3: Measure the Water Volume

• Take note of the weight displayed on your scales after filling the mould with water (for example, 201 grams).
• Divide this number by 2 to determine the amount of Jesmonite AC100 liquid you will need. For instance, 201 grams / 2 = 100.5 grams (round down to 100 grams).

Step 4: Calculate the Powder Component

• Jesmonite AC100 has a mixing ratio of 1 part liquid to 2.5 parts powder.
• Multiply the amount of liquid by 2.5 to find out how much powder you need. Continuing the example, 100 grams x 2.5 = 250 grams of powder.

Step 5: Mix the Jesmonite

• Begin by adding the 250 grams of powder to the 100 grams of liquid.
• It’s important to add the powder slowly to the liquid, not the other way around, to avoid clumping.
• Stir the mixture with a silicone whisk for about 3 to 4 minutes, ensuring there are no lumps or clumps.

Step 6: Pour the Mixture into the Mould

• Once your mixture is smooth, pour it into the mould. You can use various pouring techniques, such as zigzagging or spiraling, for different effects.
• Use a spatula or stick to smooth out the surface and eliminate air bubbles. Tap or shake the mould gently to further reduce bubbles.

Step 7: Demould Your Creation

• After around 30 minutes, it’s time to demould. Flip the mould upside down and gently pull the silicone away from the Jesmonite.
• Always pull the silicone away from the Jesmonite to minimize breakage, as the piece may still be fragile.

Conclusion

With these steps, you can confidently measure and mix Jesmonite AC100 for any flat mould project. Remember to take your time while mixing and pouring to achieve the best results. By using the water measurement method, you can ensure accuracy and reduce waste. Happy crafting, and enjoy your Jesmonite projects!