Silicone Mold, Jesmonite & Resin Mix Ratio Directory
Eliminate wasted silicone and sticky, under-cured resin batches. Select your liquid casting compound and mold shape to instantly compute required Part A and Part B gram weights with verified specific gravity and cup-scraping buffer.
Popular Mold & Casting Compounds (10 Materials)
Pre-loaded with factory specific gravity, mix ratios, and curing times:
RTV-2 Platinum Silicone (Smooth-On Mold Star 15/30)
Premium platinum-catalyzed liquid silicone rubber with a 1:1 mix ratio by weight or volume. Zero shrinkage and high tear resistance.
RTV-2 Tin Cure Silicone (Condensation Cure)
Condensation cure silicone rubber resistant to chemical inhibition. Cost-effective for prototyping over UV resin prints.
Jesmonite AC100 (Eco-Resin)
Water-based composite acrylic resin system used to create terrazzo homewares, trays, and architectural castings with a ceramic feel.
Jesmonite AC730 (Stone Casting)
Rapid-setting acrylic-modified cementitious composite designed for glass-reinforced outdoor stone cladding and statuary.
Deep Pour River Epoxy (2:1 Ratio)
Ultra-clear, low-viscosity casting epoxy engineered for deep river tables, thick slab encapsulation, and massive art pours.
Table Top & Art Epoxy (1:1 Ratio)
High-gloss protective coating and shallow casting resin for wooden countertops, art canvasses, and jewelry bezels.
Fast-Cast Polyurethane Resin (Smooth-Cast 300)
Ultra-low viscosity liquid plastic that cures in 10 minutes to a bright white solid. Ideal for resin toy casting and prop replication.
Dragon Skin FX-Pro (Prosthetic Silicone)
Ultra-soft, tear-resistant platinum silicone rubber used worldwide for high-end movie special effects and flexible masks.
Hydrocal / Pottery Plaster (USG Plaster)
High-strength gypsum plaster cement for casting durable figurines, architectural moldings, and slip-casting ceramic molds.
Clear Water-Resin Polyurethane (Clear Flex 50)
Mercury-free, water-clear flexible polyurethane elastomer designed for impact damping, optical prototypes, and prop lenses.
Complete Mold Geometry Directory (All 50 Calculators)
Browse all materials paired with each specialized mold containment container:
Casting Compound Specific Gravity & Working Time Specs
Specific gravity indicates how much heavier a material is compared to water (1.00 g/cm³):
| Casting Material | Category | Specific Gravity | Mix Ratio | Pot Life | Demold Time |
|---|---|---|---|---|---|
| RTV-2 Platinum Silicone (Smooth-On Mold Star 15/30) | Silicone | 1.07 g/cm³ | 1 : 1 (weight) | 30 min | 6 hrs |
| RTV-2 Tin Cure Silicone (Condensation Cure) | Silicone | 1.12 g/cm³ | 10 : 1 (weight) | 45 min | 12 hrs |
| Jesmonite AC100 (Eco-Resin) | Jesmonite | 1.75 g/cm³ | 2.5 : 1 (weight) | 12 min | 2 hrs |
| Jesmonite AC730 (Stone Casting) | Jesmonite | 1.85 g/cm³ | 5 : 1 (weight) | 15 min | 4 hrs |
| Deep Pour River Epoxy (2:1 Ratio) | Epoxy | 1.11 g/cm³ | 2 : 1 (weight) | 90 min | 48 hrs |
| Table Top & Art Epoxy (1:1 Ratio) | Epoxy | 1.08 g/cm³ | 1 : 1 (weight) | 25 min | 12 hrs |
| Fast-Cast Polyurethane Resin (Smooth-Cast 300) | Resin | 1.05 g/cm³ | 1 : 1 (weight) | 3 min | 0.25 hrs |
| Dragon Skin FX-Pro (Prosthetic Silicone) | Silicone | 1.07 g/cm³ | 1 : 1 (weight) | 12 min | 0.75 hrs |
| Hydrocal / Pottery Plaster (USG Plaster) | Plaster | 1.65 g/cm³ | 1.42 : 1 (weight) | 8 min | 0.75 hrs |
| Clear Water-Resin Polyurethane (Clear Flex 50) | Resin | 1.08 g/cm³ | 1 : 2 (weight) | 20 min | 16 hrs |