Calculate Your Materials
Your Materials
Enter your mold dimensions or volume to calculate materials
Frequently Asked Questions
Jesmonite AC100 uses a ratio of 2.5:1 (powder to liquid by weight). This means for every 1kg of liquid, you need 2.5kg of powder. This ratio ensures optimal strength and workability for most casting applications.
Jesmonite typically takes 24 hours to fully cure at room temperature. You can demold pieces after 2-4 hours for simple shapes, but allow 24 hours before sanding or finishing. Full strength develops over 7 days.
Yes! Add water-based pigments or dyes to the liquid component before mixing with powder. Use up to 5% pigment by weight of the liquid. For deeper colors, consider layering or using specialized Jesmonite pigments designed for optimal results.
Cracking usually occurs from incorrect ratios, overmixing, or rapid drying. Ensure accurate measurements, mix only for 2-3 minutes, and avoid direct heat. Bubbles can be minimized by tapping the mold and using a spray bottle with rubbing alcohol on the surface.
We recommend adding 10-15% extra material to account for waste, mixing container residue, and spillage. For complex molds or beginners, consider 20% extra. Our calculator uses the exact volume, so factor this in when ordering materials.
AC100 (2.5:1 ratio) is the standard formulation ideal for most casting projects. AC200 (2.3:1 ratio) offers enhanced flexibility and impact resistance, making it better for items that may be handled roughly or need to flex slightly. Choose based on your project's requirements.