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  • What is set time?

    Set time is an industry test that identifies when plaster slurry has developed enough strength to prevent a Vicat needle from penetrating through a thin plaster patty. This is helpful in defining the working time or “open time” for a plaster mix. Please note that plaster becomes unworkable or “stiff” well ahead of the actual set time, often in half the time for the slurry to set.