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Jesmonite AC100 (Eco-Resin) for Cylindrical Cup Mold Calculator

Pre-loads specific gravity (1.75) and 2.5:1 mix ratio to calculate exact Part A & Part B weights with cup scraping buffer.

Calculated Benchmark Answer

A standard Cylindrical Cup Mold (Ø9 × 12 cm minus 150 cm³ master) requires 1159g (40.89 oz / 2.56 lbs) of Jesmonite AC100 (Eco-Resin). Mix 828.1g Part A with 331.2g Part B (8% buffer included).

Casting Material & Volume Mode

SG: 1.75

Pre-loads specific gravity and 2.5:1 ratio by weight.

cylinder

Geometry determines the container-volume formula. Use water displacement when the cavity is irregular.

cm(3.5 in)
Min: 2 cm15%Max: 50 cm
cm(4.7 in)
Min: 1 cm38%Max: 30 cm
cm³(5.1 fl oz)
Min: 0 cm³3%Max: 5000 cm³

Volume displaced by your master object inside the box.

%
Min: 0 %40%Max: 20 %

Compensates for resin clinging to mixing paddles and cup walls (8% recommended).

Preset Values: Buffer Presets
Graduated Mix Volume Schematic
RATIO 2.5:1
25%50%75%100%PART A [BASE]828g29.21 oz+25%50%75%100%PART B [CATALYST]331g11.68 oz
PART A: 828.1gJesmonite AC100 (Eco-Resin)PART B: 331.2g
Total Batch RequiredKEY RESULT
1159.3grams
40.89 oz (2.56 lbs)

Includes 8% waste buffer at SG 1.75

Part A (Base)
828.1g
29.21 oz

Ratio part: 2.5

Part B (Catalyst)
331.2g
11.68 oz

Ratio part: 1

Mold Cavity Volume
613.4cm³ / mL
20.74fl oz

Net volume before buffer

Verified Casting Kit Reference Spec

Order Jesmonite AC100 (Eco-Resin) Kit

High-tear strength Jesmonite AC100 (Eco-Resin) with verified 2.5:1 ratio. Ideal for bubble-free casting.

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Jesmonite AC100 (Eco-Resin) vs Alternative Casting Compounds

Compare specific gravities, mix ratios, working times, and cure speeds across casting compounds.

Material / SpecificationSpecific GravityMix RatioPot LifeDemold Time
Jesmonite AC100 (Eco-Resin)ACTIVE1.752.5:1 (weight)12 min2 hrs
RTV-2 Platinum Silicone (Smooth-On Mold Star 15/30)1.071:1 (weight)30 min6 hrs
RTV-2 Tin Cure Silicone (Condensation Cure)1.1210:1 (weight)45 min12 hrs
Jesmonite AC730 (Stone Casting)1.855:1 (weight)15 min4 hrs
Deep Pour River Epoxy (2:1 Ratio)1.112:1 (weight)90 min48 hrs
Table Top & Art Epoxy (1:1 Ratio)1.081:1 (weight)25 min12 hrs

Step-by-Step Mix Ratio Derivation: Jesmonite AC100 (Eco-Resin)

How displacement volume, specific gravity, and ratio split combine into final scale weights.

Step 1: Calculate Net Mold Cavity Volume613.4 cm³ (mL)
Formula: V_net = π × (D / 2)² × H - V_master
Calculation: π × (9 / 2)² × 12 - 150 cm³ = 613.4 cm³ (mL)

Calculates the empty fluid cavity by taking the gross 763.4 cm³ cylinder containment volume and deducting the 150 cm³ displaced by the master model.

Step 2: Calculate Total Batch Weight with 8% Buffer1159.3 grams
Formula: W_batch = V_net × SG × (1 + Buffer_pct / 100)
Calculation: 613.4 cm³ × 1.75 × 1.08 = 1159.3 grams

Multiplies fluid volume by the specific gravity of Jesmonite AC100 (Eco-Resin) (1.75 g/cm³) plus an 8% buffer for cup scraping and pouring loss.

Step 3: Divide into Part A and Part B by Mix RatioPart A: 828.1g | Part B: 331.2g
Formula: W_A = W_batch × (R_A / (R_A + R_B))
Calculation: 1159.3g × (2.5 / 3.5) = Part A: 828.1g | Part B: 331.2g

Distributes batch mass according to the exact 2.5:1 ratio by weight.

MetriFab Precision GuaranteeFormulas cross-verified against Blum, Smooth-On, Polymaker, and eSun technical data sheets.
Zero-Lag SSG

Engineering Specifications & Troubleshooting Guide: Jesmonite AC100 (Eco-Resin)

Factory-tested parameters, common failure modes, and workbench best practices.

Maker Pro Tips
  • Water-based acrylic composite material. Zero VOCs, solvent-free, and fire-resistant (Class 0).
  • Always add the AC100 Base powder (Part A) gradually into the Liquid (Part B) while blending with a high-shear mixer blade.
  • Vibrate or tap the silicone mold firmly on the tabletop for 60 seconds immediately after pouring to release surface air bubbles.
Most Critical Mistake to Avoid

Pouring liquid into dry powder, creating impossible lumpy clumps that ruin surface fidelity.

Recommended Machine Settings
mixing TechniqueHigh-shear mixing blade on an electric drill at medium speed for 2 minutes until creamy and smooth.
degassing RequiredNo
demold NoteDemold after 2 hours once warm exothermic peak subsides. Part reaches full hardness at 24 hours as residual water evaporates.

Frequently Asked Questions: Jesmonite AC100 (Eco-Resin)

Mix ratios, degas guidelines, cure times, and mold making tips.

Q1What is the mix ratio of Jesmonite AC100 (Eco-Resin)?
Jesmonite AC100 (Eco-Resin) has a mix ratio of 2.5 Part A to 1 Part B by weight. Always weigh both components on a digital scale for maximum cure integrity.
Q2How much Jesmonite AC100 (Eco-Resin) do I need for a Cylindrical Cup Mold?
For a standard Cylindrical Cup Mold with Ø9 × 12 cm outer containment, you will need approximately 1159 grams (828.1g Part A and 331.2g Part B) including an 8% waste buffer.
Q3How long before I can demold Jesmonite AC100 (Eco-Resin)?
Jesmonite AC100 (Eco-Resin) has a pot life (working time) of 12 minutes and can safely be demolded in 2 hours at room temperature (23°C / 73°F).

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Related Master Reference Guides & Lookup Charts

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Specific Gravity
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