--- product_id: 48207962 title: "Mold Star 30 Mouldmaking Silicone Rubber - Trial Unit" brand: "smooth-on" price: "£62.65" currency: GBP in_stock: true reviews_count: 8 category: "Smooth On" url: https://www.desertcart.co.uk/products/48207962-mold-star-30-mouldmaking-silicone-rubber-trial-unit store_origin: GB region: United Kingdom --- # 45 min pot life Heat resistant to 450°F 30A Shore hardness Mold Star 30 Mouldmaking Silicone Rubber - Trial Unit **Brand:** smooth-on **Price:** £62.65 **Availability:** ✅ In Stock ## Summary > 🛠️ Mold like a pro, last like a legend. ## Quick Answers - **What is this?** Mold Star 30 Mouldmaking Silicone Rubber - Trial Unit by smooth-on - **How much does it cost?** £62.65 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/48207962-mold-star-30-mouldmaking-silicone-rubber-trial-unit) ## 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 - • **Optimized Workflow:** 1:1 mix ratio and 45-minute pot life give you ample time to perfect your mold without rush. - • **Effortless Precision:** Platinum silicone formula captures ultra-fine details with ease, perfect for professional-grade molds. - • **Heat-Resistant Reliability:** Withstands up to 450°F, making it perfect for demanding casting projects and long-term durability. - • **Durability Meets Flexibility:** Soft yet tear-resistant rubber ensures your molds withstand repeated use without compromise. - • **Versatile Casting Compatibility:** Ideal for wax, gypsum, resins, concrete, and more—expand your creative horizons. ## Overview Smooth-On Mold Star 30 is a premium platinum silicone rubber designed for high-detail, durable molds. Featuring a balanced 1:1 mix ratio, 45-minute pot life, and a 6-hour cure time, it delivers a tear-resistant, heat-resistant (up to 450°F) mold with a firm 30A Shore hardness. Perfect for casting a wide range of materials including wax, gypsum, resins, and concrete, it’s the go-to choice for professionals seeking reliability and precision without the hassle of vacuum degassing. ## Description Smooth-On Mold Star 30 from Smooth-On is an easy to use platinum silicone mold mix that cures to a soft, strong, tear resistant rubber. Mold Star 30 molds will last a long time and good for casting wax, gypsum, resins, concrete and more. Cured Mold Star rubber is heat resistant up to 450 degrees F. Mold Star 30 is harder material than Mold Star 15 & 16 with a 30A Shore hardness. Mixed ratio of1A:1B with a pot life of 45 minutes and cure time of 6 hours. Mold Star does not require vavuum degassing & is not intended for brush on mold making. 1 lb each part A & part B. Review: Easy to use, strong, excellent detail capture - Easy to use, great working time and strong upon curing. It's also well worth mentioning that the level of detail you can capture with this product is mind blowing. Work as advertised, and intended which is ideally what you want for any product at the end of the day. Review: Perfect for small molds. - This stuff is the best! I'm molding small resin pieces for jewelry and displays, and using the Crystal Clear resin in the molds. I realized after two molds, that my cure time was longer because my house was a little cold. But really. It ended up with no air bubbles in it even!! I'm in love. ## Features - Easy to use platinum silicone mold mix - Cures to a soft, stong, tear resistant rubber - Good for casting wax, gypsum, resins, concrete and more - Harder material than Mold Star 15 and 16 with a 30A Shore hardness - Mix ratio is 1A:1B by volume, pot life 45 minutes & cure time of 6 hours ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00ETAY8RI | | Best Sellers Rank | 220,254 in Home & Kitchen ( See Top 100 in Home & Kitchen ) 637 in Sculpting Moulding & Casting | | Brand Name | Smooth-On | | Colour | Blue | | Country Of Origin | USA | | Customer Reviews | 4.6 4.6 out of 5 stars (696) | | Item Dimensions | 19.1 x 15.2 x 7.6 centimetres | | Item Shape | Star | | Item Weight | 0.59 Kilograms | | Manufacturer | Smooth-On | | Manufacturer Part Number | moldstar30 | | Material Type | Silicone | | Model Number | COMINHKR067156 | | Number of Pieces | 1 | | UPC | 751635227415 | | Unit Count | 1.0 count | ## Product Details - **Brand:** Smooth-On - **Colour:** Blue - **Item dimensions L x W x H:** 19.1 x 15.2 x 7.6 centimetres - **Material:** Silicone - **Shape:** Star ## Images ![Mold Star 30 Mouldmaking Silicone Rubber - Trial Unit - Image 1](https://m.media-amazon.com/images/I/81MxIlm4+KL.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 ## Customer Reviews ### ⭐⭐⭐⭐⭐ Easy to use, strong, excellent detail capture *by M***L on 27 April 2021* Easy to use, great working time and strong upon curing. It's also well worth mentioning that the level of detail you can capture with this product is mind blowing. Work as advertised, and intended which is ideally what you want for any product at the end of the day. ### ⭐⭐⭐⭐⭐ Perfect for small molds. *by D***G on 22 December 2017* This stuff is the best! I'm molding small resin pieces for jewelry and displays, and using the Crystal Clear resin in the molds. I realized after two molds, that my cure time was longer because my house was a little cold. But really. It ended up with no air bubbles in it even!! I'm in love. ### ⭐⭐⭐⭐⭐ Very good *by A***R on 19 September 2018* Very Good, very supple, dries in 4hours, and has a good final texture. ## 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/48207962-mold-star-30-mouldmaking-silicone-rubber-trial-unit](https://www.desertcart.co.uk/products/48207962-mold-star-30-mouldmaking-silicone-rubber-trial-unit) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-27*