{"product_id":"rocky-mountain-no-1-pottery-plaster-50-lb-slip-casting-standard","title":"Rocky Mountain No. 1 Pottery Plaster (50 lb) - Slip Casting Standard","description":"\u003cp\u003eIn this review the Rocky Mountain No. 1 Pottery Plaster is assessed for potters and ceramic studios that need a reliable casting plaster. The bottom line: this 50 lb plaster is best for producers of sanitaryware and dinnerware or serious hobbyists who require a predictable set time and the industry-standard working consistency. The review highlights the plaster's recommended mix of 70 parts water to 100 parts plaster and a standard machine mix Vicat set of 14-24 minutes, which together make it straightforward to plan casting cycles and jiggering runs.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended mix:\u003c\/strong\u003e The specified 70 parts water to 100 parts plaster ratio produces a consistent pourable slip that helps maintain repeatable casting results.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustry standard:\u003c\/strong\u003e Formulated for sanitaryware and dinnerware casting, it provides the density and finish expected in professional ceramic production.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSet time consistency:\u003c\/strong\u003e A machine mix Vicat set of 14-24 minutes gives predictable working and demolding windows for batch processing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned use:\u003c\/strong\u003e Optimized for slip casting and jiggering applications so it handles well in both manual and machine workflows.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBulk packaging:\u003c\/strong\u003e The 50 lb bag offers enough material for multiple molds and production runs without frequent reordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis plaster is aimed at small production studios, ceramics teachers, and experienced hobbyists who cast plates, bowls, sanitaryware, or other hollowware and need consistent material behavior. Workshops that run regular jiggering or machine slip casting will appreciate the predictable Vicat set window and the clear recommended mix by weight.\u003c\/p\u003e\n\u003cp\u003eBeginners who want to experiment with handbuilding or low-volume decorative projects might find this product more technical than necessary and could prefer premixed hobby clays. Also, those requiring very rapid or very slow set times should check suitability before committing to large quantities.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eReliable, industry-standard formulation suited to sanitaryware and dinnerware casting.\u003c\/li\u003e\n\u003cli\u003eClear recommended mix ratio (70 parts water to 100 parts plaster) simplifies batching and repeatability.\u003c\/li\u003e\n\u003cli\u003ePredictable Vicat set time (14-24 minutes) allows planned demolding and workflow timing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNot tailored for casual handbuilders seeking ready-to-use clay; it requires careful measuring and mixing for best results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct name\u003c\/td\u003e\n\u003ctd\u003eRocky Mountain No. 1 Pottery Plaster\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e50 lb bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended consistency\u003c\/td\u003e\n\u003ctd\u003e70 parts water: 100 parts plaster (by weight)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTypical set time\u003c\/td\u003e\n\u003ctd\u003eVicat set 14-24 minutes (machine mix)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary uses\u003c\/td\u003e\n\u003ctd\u003eSlip casting and jiggering\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIndustry use\u003c\/td\u003e\n\u003ctd\u003eSanitaryware and dinnerware casting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Rocky Mountain No. 1 Pottery Plaster is a solid choice for studios and serious hobbyists who need a dependable casting plaster with a known mix ratio and set time. It offers professional behavior for sanitaryware and dinnerware production, making it good value for anyone running regular slip casting or jiggering operations who can follow the recommended mixing and timing guidance.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat mix ratio should I use?\u003c\/strong\u003e\u003cbr\u003eUse 70 parts water to 100 parts plaster by weight for the recommended working consistency.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long does it take to set?\u003c\/strong\u003e\u003cbr\u003eThe machine mix Vicat set is typically 14-24 minutes, which defines the practical working window.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs this plaster suitable for handbuilding?\u003c\/strong\u003e\u003cbr\u003eIt is formulated for slip casting and jiggering; handbuilders may prefer ready-to-use clay bodies instead.\u003c\/p\u003e","brand":"Rocky Mountain Clay","offers":[{"title":"Default Title","offer_id":48238651998427,"sku":"B0CV651VK6","price":89.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/81-01mtIK5L._AC_SL1500.jpg?v=1770788908","url":"https:\/\/gearmusthave.com\/products\/rocky-mountain-no-1-pottery-plaster-50-lb-slip-casting-standard","provider":"GearMustHave","version":"1.0","type":"link"}