.webp?unique=ef98faa)
.webp?unique=ef98faa)
Product description
MOLD STAR 30
Mold Star™ 30 is an easy-to-use, platinum-cure mold silicone. It has a 1:1 mix ratio by volume. Mold Star silicones have relatively low viscosity. Mold Star™ 30 is a firmer material with a Shore hardness of 30A. It has a pot life of 45 minutes and cures in 6 hours at room temperature.
Mold Star™ silicones cure to soft yet strong molds that are tear-resistant and have minimal long-term shrinkage. Molds made with Mold Star™ are long-lasting and suitable for casting wax, plaster, resins, and other materials. Once cured, Mold Star™ silicone can withstand heat up to 232 °C (450 °F) and is suitable for casting low-melting metal alloys.
Important: This product will not cure properly against surfaces that contain sulfur, even in closed molds. If you're unsure whether your clay contains sulfur, always perform a small test before beginning a critical project.
Properties:
- Room temperature curing
- High tear strength
- Excellent heat resistance
- Low shrinkage
- No release agent needed (in many applications)
Applications
- Mold making
- Wax and plaster casting
- Compatible with most casting resins (urethane, polyester, epoxy)
| Hardness (ShoreA) | 30 |
Mixing ratio (by volume) | 1:1 |
Pot life (23 °C) | 45 min |
Curing time (23 °C) | 6 h |
Heat resistance (min) | -53 °C |
Heat resistance (max) | 232 °C |
Shrinkage | <0.0254 mm/mm |
Viscosity (cpc) | 12 500 |
Elongation (%) | 339 |
Color | Sininen |
Instructions for use
Thoroughly mix each component before measuring, as materials may settle in storage. Measure parts A and B in a 1:1 ratio by weight or volume. Mix thoroughly for at least 3 minutes. Scrape the sides and bottom of the mixing container to ensure even curing.
Degassing – For best results, vacuum degas the mixture before pouring. Use a vacuum pump capable of pulling at least -1 bar pressure. Leave enough headroom for the silicone to expand during degassing – it will rise, break, and settle. Continue degassing for 1 more minute after the surface levels out..
Pour the silicone slowly into the lowest point of the mold and let it rise over the model. For one-piece block molds, pour at least 1 cm above the model.
Allow the mold to cure at room temperature (23 °C) for the specified time. Do not cure below 18 °C – this can slow or inhibit curing. Optional post-cure: 80 °C for 2 hours or 100 °C for 1 hour. Allow mold to cool to room temperature before use.
Cure Inhibition – Platinum silicones may not cure properly if they come into contact with certain materials, such as latex, tin-cure silicones, sulfur-containing clays, some wood surfaces, fresh polyester, epoxies, or polyurethanes. If in doubt, perform a small-scale test. Signs of inhibition include tacky or uncured silicone. To prevent inhibition, models may be sealed with a clear acrylic spray. Let the sealer dry completely before applying silicone. Note: Platinum silicone is not compatible with clays high in sulfur content. Always test before full use.
Mold Use & Storage
New silicone molds are naturally self-releasing, but repeated use—especially with resins—can wear down the surface. No release agent is needed for wax or plaster. When casting polyurethane, polyester, or epoxy resins, always use a release agent.
Clean the mold with mild soap solution and dry thoroughly. Assemble multi-part molds before storage. Store molds on a flat surface, in a cool, dry area away from direct sunlight.
Modifying Viscosity
- Use THI-VEX™ to increase the viscosity of Mold star™ silicones for brushable applications. Adjust the amount to achieve the desired consistency.
- Silicone Thinner™ lowers viscosity, making the silicone easier to pour and degas. Note that it reduces tear and tensile strength. Do not exceed 10% by weight of total mix.
Safety
Use in a well-ventilated area. Protective glasses, long sleeves, and vinyl gloves are recommended – do not use latex gloves, as they inhibit curing. Store and use at room temperature (approx. 23 °C). Higher temperatures will significantly shorten pot life, cure time, and shelf life. Use materials as soon as possible – they have a limited shelf life..