20 kg of Gypsum Online Price: 12,900 yen (tax and shipping included) For wooden molds/metal molds, and gypsum decoration production. This is a high-whiteness, high-strength gypsum for models. It is a pH-neutral type, used for industrial models and art decorations. The product will be delivered in its bag. The bag is double-layered. Instructions: 1. The standard mixing ratio for pouring is 420ml of water per 1kg of gypsum powder. Pour the required amount of water into a mixing container, and gradually sprinkle in the gypsum powder over 1 minute. After adding the gypsum powder, let it sit for 1 minute. 2. Stir with a stirring rod at a speed of about 100 times per minute for 3 minutes. Using an electric mixer to mix evenly will yield better results. Be careful, as insufficient stirring can lead to excessive water separation. 3. The gypsum will generate heat and finish setting within 35 minutes. However, the expansion rate changes while the temperature is high, so perform the demolding work after it has cooled to room temperature. Physical Properties (Manufacturer's Announcement): Mixing Ratio (per 1kg of powder) 420ml; Setting Time: Initial set 10 minutes, Final set within 35 minutes; Tensile Strength (after 2 hours) 2.5MPa; Setting Expansion Rate 0.3%. Always add gypsum to water when mixing. Adding water to gypsum may cause lumps (partial clumps) depending on the amount, which can lead to incomplete hardening. Unlike the 1kg product, there is no product instruction manual.