--- product_id: 725334922 title: "Mold Star 30 Silicone Mold Making Rubber - Trial Unit by Smooth" brand: "smooth-on" price: "£75.34" currency: GBP in_stock: true category: "Smooth On" url: https://www.desertcart.co.uk/products/725334922-mold-star-30-silicone-mold-making-rubber-trial-unit-by store_origin: GB region: United Kingdom --- # 45 min pot life Heat resistant 450°F 1:1 volume mix ratio Mold Star 30 Silicone Mold Making Rubber - Trial Unit by Smooth **Brand:** smooth-on **Price:** £75.34 **Availability:** ✅ In Stock ## Summary > 🔥 Mold like a pro, cast like a visionary! ## Quick Answers - **What is this?** Mold Star 30 Silicone Mold Making Rubber - Trial Unit by Smooth by smooth-on - **How much does it cost?** £75.34 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/725334922-mold-star-30-silicone-mold-making-rubber-trial-unit-by) ## Best For - smooth-on enthusiasts ## Why This Product - Trusted smooth-on brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Optimal Work Window:** Generous 45-minute pot life lets you craft without rush or waste. - • **Long-Lasting Durability:** Tear-resistant, low shrinkage silicone that keeps your molds library fresh and reliable. - • **Effortless Precision Mixing:** No scale needed with perfect 1:1 volume ratio for flawless molds every time. - • **Versatile Casting Compatibility:** Ideal for wax, plaster, resin, concrete, and even low-temp metal alloys up to 450°F. - • **Professional-Grade Detail Capture:** Low viscosity formula captures intricate details with ease—your projects deserve the best. ## Overview Mold Star 30 is a platinum-cured silicone rubber with shore 30A hardness, offering a 45-minute pot life and 6-hour cure time. Its 1:1 volume mix ratio eliminates measuring guesswork, while its heat resistance up to 450°F makes it perfect for diverse casting materials including wax, plaster, resin, concrete, and low-temp metal alloys. Tear-resistant and low shrinkage, it delivers professional-grade molds with exceptional detail fidelity. ## Description Mold Star rubber is easy-to-use platinum silicone mixed in 1A:1B volume (no measuring scale required). Mold Star silicone is relatively low viscosity and requires no vacuum degassing for most applications. Mold Star silicone cures a soft, strong rubber. They are tear resistant and have very low term shrinkage. Mold Star molds are long lasting in the mold library and are suitable for casting wax, plaster, resin, concrete and other materials. Cured molded star rubber is heat resistant to 450°F (232°C) and suitable for casting low-temperature fused metal alloys. NOTE: THI-VEX is NOT compatible with Mold Star rubber. Mold Star 30: Mix Ratio: 1:1 per volume POT Lifetime: 45 minutes Demolding Time: 6 hours Shore A: 30 Color: Green Read MSDS before use. See Technical Information for more information ## Features - Platinum cured silicone rubber with a shore 30A hardness - 45 minutes Pot life/6 hours hardening - Easy to mix: 1A: 1B volume mixing (no measuring scale required) - Suitable for casting wax, plaster, resin, concrete and other materials - Heat resistant up to 450°F ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00ETAY8RI | | Amazon Bestseller | #613,162 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #895 in Candy Making Supplies #3,236 in Hobby Building Tools & Hardware | | Brand Name | Smooth-On | | Color | blue | | Customer Reviews | 4.6 4.6 out of 5 stars (698) | | Item Dimensions | 19.1 x 15.2 x 7.6 cm | | Item Weight | 0.59 Kilograms | | Manufacturer | Smooth-On, Inc. | | Manufacturer Part Number | moldstar30 | | Material Type | Silicone | | Model Number | COMINHKR067156 | | Number of Pieces | 1 | | Shape | Star | | UPC | 751635227415 | ## Product Details - **Brand:** Smooth-On - **Color:** blue - **Item dimensions L x W x H:** 19.1 x 15.2 x 7.6 cm - **Material:** Silicone - **Shape:** Star ## Images ![Mold Star 30 Silicone Mold Making Rubber - Trial Unit by Smooth - Image 1](https://m.media-amazon.com/images/I/81MxIlm4+KL.jpg) ![Mold Star 30 Silicone Mold Making Rubber - Trial Unit by Smooth - Image 2](https://m.media-amazon.com/images/I/71MKTOvqFRL.jpg) ![Mold Star 30 Silicone Mold Making Rubber - Trial Unit by Smooth - Image 3](https://m.media-amazon.com/images/I/719AiOp-2JL.jpg) ![Mold Star 30 Silicone Mold Making Rubber - Trial Unit by Smooth - Image 4](https://m.media-amazon.com/images/I/810O9OZWSoL.jpg) ![Mold Star 30 Silicone Mold Making Rubber - Trial Unit by Smooth - Image 5](https://m.media-amazon.com/images/I/71wzkM3noYL.jpg) ## Questions & Answers **Q: whats the difference between oomo 30 and moldstar ?** A: OOMOO 30 has a Shore hardness rating of 00-30, which is about as squishy as a gel shoe insert. Moldstar 30 is a hardness of Shore A-30, which is closer to pencil eraser hardness. It’s confusing, but there are 2 Shore hardness scales and a 30 on one is very different from a 30 on the other. In the description when it talks about hardness, pay attention to whether it says Shore A or Shore 00. **Q: What color is this silicone? Can I use mica powders to color it** A: It is blue when mixed, and very opaque, so I doubt powders will be able to color it much if at all. If you're looking to label your molds, I've 3D printed mirrored text using a raft, and set it into the mixed material. It floats, and pulls away cleanly once the material is cured. If you want a platinum cure 2 part silicone around shore-A 30 you can color, I might suggest DragonSkin 30 or Platsil Gel-25. **Q: Hi. i've made a wax mold of a small animal bone using this silicone method. i'm curious if i can use clay as well. i'm looking to make jewelry..** A: On Smooth On's website it states that this line of mold will not work with modeling clays that contain sulfur. Their website was very helpful and has lots of information: http://www.smooth-on.com/Silicone-Rubber-an/c2_1115_1341/index.html **Q: Is this food safe?** A: No. Smooth On does however make a food safe silicone called Smooth -Sil 940 ## Frequently Bought Together - Smooth-On Mold Star 30-1A:1B Mix by Volume Platinum Silicone Rubber - Pint Unit - Smooth-On Universal Mold Release - 14 Fluid Ounce Aerosol Can - Smooth-Cast™ 300: Bright White, Low Viscosity, Liquid Plastic Casting Resin - Pint Unit --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/725334922-mold-star-30-silicone-mold-making-rubber-trial-unit-by](https://www.desertcart.co.uk/products/725334922-mold-star-30-silicone-mold-making-rubber-trial-unit-by) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-31*