Castaldo LiquaGlass™ is a clear, two-part liquid molding rubber for creating see-through RTV molds with zero shrinkage. Ideal for jewelry mold making, LiquaGlass™ offers clarity, flexibility, and strength—so you can see your work as you cut and inject wax. This 1 kilo kit includes 450 grams each of Part A and Part B and cures at room temperature.
Features
- 100% clear RTV molding rubber—see through your molds as you inject wax
- Zero shrinkage (0.0%) for high dimensional accuracy
- Easy 1:1 mix ratio by weight—no volume guesswork
- Low viscosity (≈ 1,200 cps) for smooth mixing and bubble-free casting
- Cures at room temperature (70 °F / 21 °C) in 16–24 hours
- Clear blue-green finish for maximum visibility during mold cutting
Specifications
| Mix Ratio (by Weight) |
1 : 1 |
| Viscosity |
1,200 cps (very low) |
| Hardness |
Shore A 50 ± 2 |
| Shrinkage |
0.0% |
| Specific Gravity |
1.00 |
| Tensile Strength (Before Break) |
2.1 N/mm² |
| Elongation (Before Break) |
750% |
| Tear Strength (Die C) |
12.9 N/mm² |
| Color |
Clear blue/green |
| Kit Net Weight |
1 kilo (900 g usable rubber) |
What's Included
- 450 g Part A
- 450 g Part B
- Instruction sheet and mixing guide
Instructions for Use
- Shake both Part A and Part B well before use.
- Measure equal parts by weight (1:1 ratio) using a precise scale—do not estimate or measure by volume.
- Pour Part A into Part B and mix by hand for 3–4 minutes until color is uniform, scraping the sides and bottom of the bowl.
- Vacuum the mixture for approximately 5 minutes to remove air bubbles—it should rise and collapse once.
- Pour into the mold frame, avoiding air entrapment, then vacuum again for 3 minutes.
- Allow to cure at room temperature (77 °F / 25 °C) for 16–24 hours. Do not disturb during cure.
Approximate Rubber Usage Guide
| Mold Frame Size |
Part A (g) |
Part B (g) |
Total (g) |
| 0.75″ (19 mm) |
60 g |
60 g |
120 g |
| 1.00″ (25 mm) |
77 g |
77 g |
154 g |
| 1.25″ (32 mm) |
105 g |
105 g |
210 g |
| 1.50″ (38 mm) |
113 g |
113 g |
226 g |
Notes
- Porous materials such as wood, terra cotta, and plaster must be sealed with wax, PVA, or potter's soap before casting.
- LiquaGlassâ„¢ is not a silicone rubber; follow the manufacturer's mixing and vacuuming instructions carefully.
- Longer cure times produce stronger, more stable molds without deformation.
- Store unmixed components in a cool, dry area (50–80 °F / 10–27 °C) with containers sealed to prevent moisture contamination.
- Wear gloves and protective eyewear when mixing and vacuuming.
California Prop 65 Warning: