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LeanRock from Whip-Mix is an ISO Type 4, low-expansion die stone ideal for pouring small batches (about 6) and creating working models in 15 minutes. LeanRock's superior workflow and minimal wait time allows small batches to be produced, trimmed and pinned only after 15 minutes. This reduces "bottleneck" that often occurs with large batches and creates more accurate models. Models are able to be scanned with the Cad Cam systems, so a specialty scan stone or spray is no longer required. LeanRock is a high strength stone that can withstand abrasions and it has a rich ivory color creating clean, precise margins. Working time: 4-5 minutes Liquid to powder ratio: 20/100 7200 psi