What is the mixing order of gypsum powder? Jinan gypsum powder is introduced by professionals.

　　先加水后加入石膏粉，記住這一點很重要，先加水后攪拌石膏粉是很困難的，石膏的硬度和攪拌均勻的程度是成正比的，攪拌越均勻，牢度越高。

　　It is important to remember that it is very difficult to mix gypsum powder after adding water. The hardness of gypsum is proportional to the degree of uniformity. The more uniform the stirring, the higher the fastness.

　　凝結時間主要與所加水量有關(需另加)，其次是攪拌時間、澆注容器、溫濕度。首先是水、石膏粉的混合比例，水越多石膏凝結時間越長，石膏密度越低，牢度越低，水越少凝結時間越短，密度越大，牢度越高，具體需要根據使用要求加以控制。

　　The setting time is mainly related to the amount of water added (additional), followed by mixing time, pouring container, temperature and humidity. The first is the mixing ratio of water and gypsum powder. The more water, the longer the setting time of gypsum, the lower the density of gypsum, the lower the fastness, the shorter the setting time of less water, the greater the density and the higher the fastness, which need to be controlled according to the specific requirements.

　　然后我們將討論攪拌時間。一般情況下，攪拌至石膏粉均勻即可澆注。一般可在5分鐘內控制。鑄造容器與凝固時間的關系:鑄入非吸水性容器(硅膠模具等)凝固時間不變，鑄入吸水性容器(紙箱、木箱等)凝固時間縮短。

　　Then we will discuss the mixing time. Generally, mixing until the gypsum powder is even can be poured. Usually it can be controlled in 5 minutes. The relationship between casting vessel and solidification time: the solidification time of casting non-water absorbent vessel (silica gel mould, etc.) remains unchanged, while the solidification time of casting water absorbent vessel (carton, wooden box, etc.) is shortened.

　　它主要是化學沉積的產物，常形成巨大的礦層或透鏡體，見于石灰巖、紅頁巖和砂巖、泥灰巖和粘土巖系列中，常與硬石膏和石鹽共存。硬石膏層位于地表附近，由于外部壓力的降低，在地表水的作用下，硬石膏層轉化為石膏。同時體積增大約30%，對石膏層造成破壞。

　　It is mainly the product of chemical deposition and often forms huge ore beds or lenses. It is found in limestone, red shale and sandstone, marl and claystone series, and often coexists with anhydrite and gypsum salts. Anhydrite layers are located near the surface. Due to the decrease of external pressure, under the action of surface water, anhydrite layers are converted into gypsum. At the same time, the volume of the gypsum layer was increased by about 30%, which caused damage to the gypsum layer.

　　鑒定特征:硬度低，一套極性完全解理，并可對各種形貌特征進行鑒定。致密塊狀石膏與碳酸鹽的區別在于它的硬度低，在酸存在下不起泡。

　　Identification characteristics: low hardness, a complete set of polarity cleavage, and can identify various morphological characteristics. The difference between compact massive gypsum and carbonate is that it has low hardness and does not foam in the presence of acid.

　　這很容易理解，石膏粉中的水粉被模具吸收，當然凝固時間短。溫度、濕度與凝固的關系:溫度越高，凝固時間越短;溫度越低，凝固時間越長;濕度越大，凝固時間越長;濕度越低，凝固時間越短。

　　It is easy to understand that the water powder in the gypsum powder is absorbed by the mould, of course, the solidification time is short. The relationship between temperature, humidity and solidification: the higher the temperature, the shorter the solidification time; the lower the temperature, the longer the solidification time; the higher the humidity, the longer the solidification time; the lower the humidity, the shorter the solidification time.

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