Castaldo LiquaGlass-No Shrink, See-Thru Room Temperature Mold Rubber-1 Kilo Kit

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

What's Included

• 450 g Part A
• 450 g Part B
• Instruction sheet and mixing guide

Instructions for Use

1. Shake both Part A and Part B well before use.
2. Measure equal parts by weight (1:1 ratio) using a precise scale—do not estimate or measure by volume.
3. 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.
4. Vacuum the mixture for approximately 5 minutes to remove air bubbles—it should rise and collapse once.
5. Pour into the mold frame, avoiding air entrapment, then vacuum again for 3 minutes.
6. Allow to cure at room temperature (77 °F / 25 °C) for 16–24 hours. Do not disturb during cure.

Approximate Rubber Usage Guide

Notes

• Porous materials such as wood, terra cotta, and plaster must be sealed with wax, PVA, or potter's soap before casting.
• LiquaGlass™ 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:
Cancer and Reproductive Harm. www.P65warnings.ca.gov.