{"product_id":"mold-star-15-slow-1a-1b-platinum-silicone-rubber-durable-low","title":"Mold Star 15 SLOW 1A:1B Platinum Silicone Rubber - Durable, Low","description":"\u003cp\u003eIn this review we look at Mold Star 15 SLOW, a 1A:1B by volume platinum silicone rubber aimed at mold makers who need a durable, low-shrinkage material for repeated casting. The bottom line: this is a reliable, easy-to-mix silicone that saves time by avoiding weighing scales and performs well with a wide range of casting materials. For hobbyists and small studios who want long-lasting soft rubber molds and compatibility with wax, gypsum, resin, concrete, and low-temp metal alloys, Mold Star 15 SLOW earns its place in a mold library.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple 1:1 mix:\u003c\/strong\u003e Mixing by volume removes the need for a scale, speeding setup and reducing measurement errors for routine molding work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable platinum rubber:\u003c\/strong\u003e The cured rubber is tear resistant and designed for long life, so molds hold detail over many casting cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide material compatibility:\u003c\/strong\u003e Suitable for casting wax, gypsum, resins, concrete and low-temperature melt metal alloys, making it a versatile workshop material.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh heat resistance:\u003c\/strong\u003e Withstands up to 450F (232C) once cured, so it tolerates hotter pours than many common rubbers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow long-term shrinkage:\u003c\/strong\u003e The formulation reduces dimensional change over time, which helps preserve accurate reproductions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePractical working times:\u003c\/strong\u003e A 50 minute pot life and roughly 4 hour demold time balance slow cures with reasonable throughput for small batches.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eExperienced hobbyists, prop makers, and small studio artisans who need a dependable, soft platinum silicone for repeat casting will find Mold Star 15 SLOW well suited to their workflow. Its 1:1 by volume mix and moderate pot life make it particularly convenient for projects where vacuum degassing is unnecessary.\u003c\/p\u003e\u003cp\u003eThose who require very fast turnaround, industrial-scale production, or compatibility with specialty thickeners labeled incompatible with Mold Star (for example THI-VEX) should consider other product grades or consult technical data to ensure the formulation meets specialized needs.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eEasy 1:1 volume mixing eliminates the need for scales and simplifies small-batch work.\u003c\/li\u003e\n\u003cli\u003eTear-resistant cured rubber delivers durable molds that retain detail over time.\u003c\/li\u003e\n\u003cli\u003eHigh heat tolerance expands casting options to include low-temperature metal alloys.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eLonger demold time and 50 min pot life mean slower throughput compared with very fast-cure silicones.\u003c\/li\u003e\n\u003cli\u003eNot compatible with THI-VEX, so some additives and thickening choices are limited.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eMix Ratio\u003c\/td\u003e\n\u003ctd\u003e1:1 by volume\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePot Life\u003c\/td\u003e\n\u003ctd\u003e50 minutes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDemold Time\u003c\/td\u003e\n\u003ctd\u003e4 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShore A Hardness\u003c\/td\u003e\n\u003ctd\u003e15\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Resistance\u003c\/td\u003e\n\u003ctd\u003eUp to 450F (232C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eGreen\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eMold Star 15 SLOW is a practical choice for artisans who value easy volume mixing, tear resistance and heat tolerance in a soft platinum silicone. It is good value for small studios and hobbyists who cast wax, resins, gypsum, concrete or low-temp metal alloys and want molds that hold detail over many uses, though shop managers needing very fast cycles should evaluate faster-curing alternatives.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan I mix Mold Star 15 SLOW by volume without a scale?\u003c\/strong\u003e\u003cbr\u003eYes, the product is formulated for a 1A:1B by volume mix so accurate volume measurement is sufficient for proper cure.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs vacuum degassing required?\u003c\/strong\u003e\u003cbr\u003eMost applications do not require vacuum degassing due to the material's relatively low viscosity, though complex pours may still benefit from degassing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan it be used with metal casting?\u003c\/strong\u003e\u003cbr\u003eIt is suitable for casting low-temperature melt metal alloys thanks to its cured heat resistance up to 450F (232C).\u003c\/p\u003e","brand":"Smooth-On","offers":[{"title":"Default Title","offer_id":48249299501275,"sku":"B09MFY3KFF","price":270.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/41BWzWTaeTL._AC.jpg?v=1771092749","url":"https:\/\/gearmusthave.com\/products\/mold-star-15-slow-1a-1b-platinum-silicone-rubber-durable-low","provider":"GearMustHave","version":"1.0","type":"link"}