Jesmonite AC100 Coaster Ratio Calculator
Calculate mix weights for Jesmonite AC100 (2.5:1), AC300 (3:1), and AC730 (4:1) castings. Scale mineral base powder and liquid acrylic weights. Adjust the parameters in the interactive workbench below to get immediate recipe card outputs.
Jesmonite & Plaster Batch Splitter
Scale from 1 prototype to full production run
MEASUREMENT OUTPUTS
Jesmonite AC100 Batch Summary
Studio Batch of 1 piece of cylinder (DIAMETER 10cm x DEPTH / HEIGHT 1.5cm) using Jesmonite AC100: • Per Single Unit: 162.0g Base Powder + 64.8g Liquid (Total: 226.8g). • Total Studio Run (1 Units): 162.0g Base Powder + 64.8g Liquid (Total Mass: 226.8g). • Mix Ratio: 2.5:1 | Waste: 10%.
MakerRatio • Studio Workshop Batch Sheet
https://makerratio.com • Precision Craft Formula Record
Date: _______________
Batch #: ____________
Project: Jesmonite AC100 (cylinder x 1)
Category: Mineral Composite
Dimensions: cylinder (x1)
Mix Ratio: 2.5:1 (Powder:Liquid) | Batch: 1 unit(s)
Specific Gravity: 1.75 g/ml
Safety Spill Margin: 10%
Batch Mix Breakdown (By Exact Weight)
Workshop Safety & Quality Protocol:
[ ] Ambient room temp 70°F–78°F (21°C–25°C) & mold leveled.
[ ] Protective nitrile gloves on & workspace ventilation active.
[ ] Mix thoroughly scraping sides and bottom for 3 full minutes.
[ ] Verify pot life and demold window per manufacturer TDS.
Curing Schedule Log:
Pour Time: ___________
Gel / Tack-Free: ______
Demold Time: ________
Recommended Materials & Tools for this Project
Jesmonite AC100 Composite Base & Liquid
Formula: Official 2.5:1 base powder to acrylic liquid ratio. Water-based, solvent-free composite for coasters, trays, and vessels.
Heavy-Duty Silicone Coaster Molds Pack
Specification: Flexible, tear-resistant platinum silicone molds (circle and hexagon) with thick sidewalls to prevent bowing.
Transparency Notice: As an Amazon Associate, MakerRatio earns from qualifying purchases at zero extra cost to you. Product recommendations are selected based on verified Manufacturer Technical Data Sheets (TDS). Always consult chemical safety data before pouring.
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To calculate the exact volume and weight splits for this craft project, the workbench executes the following geometric equations:
Jesmonite AC100 Standard Decor Mold Mix Matrix
2.5:1 Ratio Official SpecExact Base Powder, Acrylic Liquid, and pigment limits across popular silicone home decor molds using Jesmonite AC100 (1.75 g/ml specific gravity).
| Mold Shape & Home Decor Item | Total Slurry Weight (1.75 g/ml) | AC100 Base Powder (2.5 Wt / 71.4%) | AC100 Liquid (1.0 Wt / 28.6%) | Max Pigment (2% Wt) | Demold Time |
|---|---|---|---|---|---|
| Round Coaster (10 cm × 1 cm) | 140.0 g (4.94 oz) | 100.0 g | 40.0 g | 2.8 g | 20 – 30 mins |
| Set of 4 Round Coasters (10 cm) | 560.0 g (19.75 oz) | 400.0 g | 160.0 g | 11.2 g | 20 – 30 mins |
| Oval Trinket Tray (18 × 9.5 × 1.5 cm) | 260.0 g (9.17 oz) | 185.7 g | 74.3 g | 5.2 g | 25 – 35 mins |
| Hexagon Coaster (10 cm × 1 cm) | 150.0 g (5.29 oz) | 107.1 g | 42.9 g | 3.0 g | 20 – 30 mins |
| Round Serving Tray (20 cm × 1.5 cm) | 520.0 g (18.34 oz) | 371.4 g | 148.6 g | 10.4 g | 30 – 40 mins |
| Shell Trinket Dish (11 × 10 × 2 cm) | 175.0 g (6.17 oz) | 125.0 g | 50.0 g | 3.5 g | 25 – 30 mins |
| Candle Vessel Jar (8 cm × 8 cm) | 320.0 g (11.29 oz) | 228.6 g | 91.4 g | 6.4 g | 30 – 45 mins |
In-Depth Crafting Guide & Density Analysis
Jesmonite AC100 is an eco-friendly composite material composed of a reactive mineral base powder and a pure water-based acrylic emulsion. Widely popular for artisanal coasters, terrazzo trays, and architectural decor, Jesmonite cures in 20 to 30 minutes without emitting toxic VOCs.
Because Jesmonite is mixed strictly by weight at a 2.5:1 ratio and has a dense specific gravity of 1.75 g/ml, manual calculations are prone to error. This tool divides target batch weights, calculates exact liquid-to-powder splits, and caps pigment additions at the 2% chemical safety threshold.
Frequently Asked Questions (Jesmonite Coaster Ratio Calculator)
What is the exact official mixing ratio for Jesmonite AC100?
The official ratio is 2.5 : 1 by weight (2.5 parts Base Powder to 1 part Acrylic Liquid). To calculate: divide total weight by 3.5 to get the Liquid weight (Total / 3.5), then multiply the Liquid weight by 2.5 to get the Base Powder weight.
Why is Jesmonite AC100 75% heavier than water for the same silicone mold?
Jesmonite AC100 has a cured specific gravity of 1.75 g/ml. If a mold cavity holds 100 ml of water, it requires 175 grams of mixed Jesmonite slurry (125g Powder + 50g Liquid). Using a 1:1 water weight calculation will result in severely underfilled molds.
What is the maximum amount of liquid pigment you can add to Jesmonite?
Never exceed 2% of total mix weight in pigment (e.g., maximum 2.8g of pigment for a 140g coaster). Adding more than 2% saturates the acrylic polymer, resulting in weak, chalky casts that crack easily and never achieve full hardness.
How do you eliminate pinhole air bubbles on the surface of Jesmonite castings?
(1) Mix powder into liquid with a high-shear blade attached to a drill for 60 seconds, (2) paint a thin 'face coat' into the mold details with a dry brush to pop trapped surface bubbles, (3) pour the remaining slurry, and (4) firmly tap the sides and vibrate the table for 60 seconds.
How long should Jesmonite cure before sealing for water and wax resistance?
Demold after 20–30 minutes, but let the piece dry and cure in an open room for 24 to 48 hours until all free moisture evaporates. Once fully dry, seal with an acrylic sealer (like Jesmonite Acrylic Sealer) or food-safe penetrating wax.
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