Verified Engineering EngineInteractive 2D Schematic

Jesmonite AC730 (Stone Casting) for Cylindrical Cup Mold Calculator

Pre-loads specific gravity (1.85) and 5:1 mix ratio to calculate exact Part A & Part B weights with cup scraping buffer.

Calculated Benchmark AnswerDatasheet-Derived Math

A standard Cylindrical Cup Mold (Ø9 × 12 cm minus 150 cm³ master) requires 1226g (43.23 oz / 2.7 lbs) of Jesmonite AC730 (Stone Casting). Mix 1021.3g Part A with 204.3g Part B (8% buffer included).

Casting Material & Volume Mode

Casting Compound / ResinSG: 1.85

Pre-loads specific gravity and 5:1 ratio by weight.

Mold Geometrycylinder

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

Calculation Method

Mold Inside Diameter

cm(3.5 in)

Min: 2 cm15%Max: 50 cm

Mold Pour Height / Depth

cm(4.7 in)

Min: 1 cm38%Max: 30 cm

Master Part Volume (Deduction)

cm³(5.1 fl oz)

Min: 0 cm³3%Max: 5000 cm³

Volume displaced by your master object inside the box.

Waste & Cup-Scraping Buffer

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 5:1

PART A: 1021.3gJesmonite AC730 (Stone Casting)PART B: 204.3g

Total Batch RequiredKEY RESULT

1225.6grams

43.23 oz (2.7 lbs)

Includes 8% waste buffer at SG 1.85

Part A (Base)

1021.3g

36.03 oz

Ratio part: 5

Part B (Catalyst)

204.3g

7.21 oz

Ratio part: 1

Mold Cavity Volume

613.4cm³ / mL

20.74fl oz

Net volume before buffer

Verified Casting Kit Reference Spec

Order Jesmonite AC730 (Stone Casting) Kit

High-tear strength Jesmonite AC730 (Stone Casting) with verified 5:1 ratio. Ideal for bubble-free casting.

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Jesmonite AC730 (Stone Casting) vs Alternative Casting Compounds

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

Material / Specification	Specific Gravity	Mix Ratio	Pot Life	Demold Time
Jesmonite AC730 (Stone Casting)ACTIVE	1.85	5:1 (weight)	15 min	4 hrs
RTV-2 Platinum Silicone (Smooth-On Mold Star 15/30)	1.07	1:1 (weight)	30 min	6 hrs
RTV-2 Tin Cure Silicone (Condensation Cure)	1.12	10:1 (weight)	45 min	12 hrs
Jesmonite AC100 (Eco-Resin)	1.75	2.5:1 (weight)	12 min	2 hrs
Deep Pour River Epoxy (2:1 Ratio)	1.11	2:1 (weight)	90 min	48 hrs
Table Top & Art Epoxy (1:1 Ratio)	1.08	1:1 (weight)	25 min	12 hrs

Step-by-Step Mix Ratio Derivation: Jesmonite AC730 (Stone Casting)

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% Buffer1225.6 grams

Formula: W_batch = V_net × SG × (1 + Buffer_pct / 100)

Calculation: 613.4 cm³ × 1.85 × 1.08 = 1225.6 grams

Multiplies fluid volume by the specific gravity of Jesmonite AC730 (Stone Casting) (1.85 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: 1021.3g | Part B: 204.3g

Formula: W_A = W_batch × (R_A / (R_A + R_B))

Calculation: 1225.6g × (5 / 6) = Part A: 1021.3g | Part B: 204.3g

Distributes batch mass according to the exact 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 AC730 (Stone Casting)

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

Maker Pro Tips

Formulated with decorative stone aggregates for outdoor architectural facades and garden planters.
Acid-etch the cured surface with 5% brick acid or vinegar to expose shimmering granite/sandstone aggregates.

Most Critical Mistake to Avoid

Allowing direct outdoor water exposure before the complete 7-day moisture cure is achieved.

Recommended Machine Settings

mixing TechniqueMechanical paddle mixer; fold slowly to preserve aggregate texture.

degassing RequiredNo

demold NoteDemold after 4 hours. Keep under plastic wrap for 24 hours to cure.

Frequently Asked Questions: Jesmonite AC730 (Stone Casting)

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

Q1What is the mix ratio of Jesmonite AC730 (Stone Casting)?

Jesmonite AC730 (Stone Casting) has a mix ratio of 5 Part A to 1 Part B by weight. Always weigh both components on a digital scale for maximum cure integrity.

Q2How much Jesmonite AC730 (Stone Casting) do I need for a Cylindrical Cup Mold?

For a standard Cylindrical Cup Mold with Ø9 × 12 cm outer containment, you will need approximately 1226 grams (1021.3g Part A and 204.3g Part B) including an 8% waste buffer.

Q3How long before I can demold Jesmonite AC730 (Stone Casting)?

Jesmonite AC730 (Stone Casting) has a pot life (working time) of 15 minutes and can safely be demolded in 4 hours at room temperature (23°C / 73°F).

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Jesmonite AC730 (Stone Casting) for Cylindrical Cup Mold Calculator

Casting Material & Volume Mode

Order Jesmonite AC730 (Stone Casting) Kit

Jesmonite AC730 (Stone Casting) vs Alternative Casting Compounds

Step-by-Step Mix Ratio Derivation: Jesmonite AC730 (Stone Casting)

Engineering Specifications & Troubleshooting Guide: Jesmonite AC730 (Stone Casting)

Frequently Asked Questions: Jesmonite AC730 (Stone Casting)

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