--- product_id: 256679582 title: "Mold Star 30 Silicone Mold Making Rubber - Trial Unit | Long-Lasting Silicone Mold" brand: "smooth-on" price: "R2230" currency: ZAR in_stock: true reviews_count: 5 category: "Smooth On" url: https://www.desertcart.co.za/products/256679582-mold-star-30-silicone-mold-making-rubber-trial-unit-long store_origin: ZA region: South Africa --- # 45 min pot life 450°F heat resistance tear resistant & durable Mold Star 30 Silicone Mold Making Rubber - Trial Unit | Long-Lasting Silicone Mold **Brand:** smooth-on **Price:** R2230 **Availability:** ✅ In Stock ## Summary > 🔥 Mold like a pro, last like a legend! ## Quick Answers - **What is this?** Mold Star 30 Silicone Mold Making Rubber - Trial Unit | Long-Lasting Silicone Mold by smooth-on - **How much does it cost?** R2230 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/256679582-mold-star-30-silicone-mold-making-rubber-trial-unit-long) ## 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 - • **No Vacuum Needed:** Bubble-free molds without expensive degassing equipment. - • **Versatile Casting:** Perfect for wax, gypsum, resins, concrete, and more. - • **Extended Work Time:** 45 minutes pot life means no rush, perfect for complex projects. - • **Effortless Precision:** Captures every fine detail with soft yet strong silicone. - • **Heat-Resistant Durability:** Withstands up to 450°F, ideal for low-temp metal casting. ## Overview Smooth-On Mold Star 30 is a platinum silicone rubber that cures to a tear-resistant, flexible mold with a Shore hardness of 30A. It offers a generous 45-minute pot life and cures in 6 hours without vacuum degassing. Heat resistant up to 450°F, it’s perfect for casting wax, gypsum, resins, concrete, and low-temp metal alloys, making it a reliable choice for durable, high-detail molds. ## 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: Survived my chaos and still made a perfect mold - I bought this for a “quick little project” which somehow turned into me panicking, spilling silicone everywhere, trapping objects in glass containers, and questioning my life choices at 2 AM. And honestly? This silicone still performed beautifully. The mix ratio was easy enough that even a sleep-deprived beginner could handle it, the bubbles were minimal, and the cured mold came out flexible, strong, and super detailed. I used it for casting decorative pieces and it picked up every tiny texture perfectly. Biggest surprise: it actually gives you enough working time before curing, so you’re not fighting the clock like in some other products. Demolding was also way easier than expected. A few helpful notes for beginners: * Mix slowly if you want fewer bubbles * Don’t underestimate how well this stuff sticks around once spilled * Use gloves unless you want “mysterious silicone fingerprints” on everything you own for 3 days Overall, excellent product. My project survived, my sanity mostly survived, and now I want to mold everything in my apartment. Review: Warum nicht mehr angeboten - Produkt ist super. Warum wird nicht mehr angeboten. Benötige dringend 2x ## Features - Mold Star silicones cure to soft, strong rubbers which are tear resistant and exhibit very low long term shrinkage. - Molds made with Mold Star will last a long time in your mold library and are good for casting wax, gypsum, resins, and other materials. - Cured Mold Star rubber is heat resistant up to 450°F (232°C) and is suitable for casting low-temperature melt metal alloys. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00ETAY8RI | | Brand | Smooth-On | | Brand Name | Smooth-On | | Color | Blue | | Colour | Blue | | Customer Reviews | 4.6 out of 5 stars 700 Reviews | | Item Dimensions | 19.1 x 15.2 x 7.6 centimeters | | Item Weight | 1.12 kg | | Item dimensions L x W x H | 19.1 x 15.2 x 7.6 centimeters | | Manufacturer | Smooth-On | | Manufacturer Part Number | moldstar30 | | Material | Silicone | | Material Type | Silicone | | Model Number | COMINHKR067156 | | Number of Pieces | 1 | | Number of pieces | 1 | | Shape | Star | | UPC | 751635227415 | | Unit Count | 1 Count | ## Product Details - **Brand:** Smooth-On - **Colour:** Blue - **Item dimensions L x W x H:** 19.1 x 15.2 x 7.6 centimeters - **Material:** Silicone - **Shape:** Star ## Images ![Mold Star 30 Silicone Mold Making Rubber - Trial Unit | Long-Lasting Silicone Mold - 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 ### ⭐⭐⭐⭐⭐ Survived my chaos and still made a perfect mold *by İ***A on 18 May 2026* I bought this for a “quick little project” which somehow turned into me panicking, spilling silicone everywhere, trapping objects in glass containers, and questioning my life choices at 2 AM. And honestly? This silicone still performed beautifully. The mix ratio was easy enough that even a sleep-deprived beginner could handle it, the bubbles were minimal, and the cured mold came out flexible, strong, and super detailed. I used it for casting decorative pieces and it picked up every tiny texture perfectly. Biggest surprise: it actually gives you enough working time before curing, so you’re not fighting the clock like in some other products. Demolding was also way easier than expected. A few helpful notes for beginners: * Mix slowly if you want fewer bubbles * Don’t underestimate how well this stuff sticks around once spilled * Use gloves unless you want “mysterious silicone fingerprints” on everything you own for 3 days Overall, excellent product. My project survived, my sanity mostly survived, and now I want to mold everything in my apartment. ### ⭐ Warum nicht mehr angeboten *by F***L on 12 February 2026* Produkt ist super. Warum wird nicht mehr angeboten. Benötige dringend 2x ### ⭐⭐⭐⭐⭐ 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. ## 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.za/products/256679582-mold-star-30-silicone-mold-making-rubber-trial-unit-long](https://www.desertcart.co.za/products/256679582-mold-star-30-silicone-mold-making-rubber-trial-unit-long) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-07-29*