有些朋友問，為什么制作的地臺、模具會開裂？主要原因是選用了不適當的石膏粉。下面來講講調配濟南石膏粉時的凝固時間掌握內容。

Some friends asked why the platform and mold made of it would crack? The main reason is that inappropriate gypsum powder is selected. Now let's talk about how to master the setting time when preparing Jinan gypsum powder.

凝固時間主要與加水量有關系（添加劑另外說明），次之與攪拌時間、澆鑄容器、溫度、濕度有關系。

The setting time is mainly related to the amount of water added (the additive is explained separately), and then to the mixing time, casting container, temperature and humidity.

先水、石膏粉混合比，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，具體需根據使用需求來控制。

The mixing ratio of water and gypsum powder, the more water, the longer the setting time of gypsum, the lower the density and fastness of gypsum, the less water, the shorter the setting time, the greater the density and the higher the fastness, which shall be controlled according to the use requirements.

然后談下攪拌時間，一般而言攪拌到石膏粉非常均勻即可澆鑄，一般控制在5分鐘之內，攪拌時間越長，石膏粉凝固時間越快。澆鑄容器與凝固時間的關系，澆鑄入不吸水的容器內（硅膠模具等）鑄型凝固時間不變，澆鑄入吸水的容器內（比如紙盒、木盒等），凝固時間縮短。

Then talk about the mixing time. Generally speaking, the gypsum powder can be cast when it is very uniform. Generally, it is controlled within 5 minutes. The longer the mixing time is, the faster the setting time of gypsum powder is. The relationship between the casting container and the solidification time, the solidification time of the casting mold in the non water absorbing container (silica gel mold, etc.) remains unchanged, while the solidification time is shortened when casting into the water absorbing container (such as paper box, wooden box, etc.).

這個比較好理解，石膏粉內的水粉被模具吸收，當然凝固時間縮短。溫度、濕度與凝固關系，氣溫越高凝固時間越短，氣溫越低凝固時間越長，濕度越高凝固時間越長，濕度越低凝固時間越短。

This is easy to understand. The water powder in the gypsum powder is absorbed by the mold, and of course the setting time is shortened. Temperature, humidity and solidification. The higher the temperature is, the shorter the solidification time is. The lower the temperature is, the longer the solidification time is. The higher the humidity is, the longer the solidification time is. The lower the humidity is, the shorter the solidification time is.

調配石膏粉次序也要明白，先加水后加石膏粉，切記這點很重要，先粉后水石膏粉很難攪拌到非常均勻，石膏的硬度與攪拌的均勻程度是成正比的，攪拌越均勻，牢度越高。關注我們http://m.sjzmx.cn了解更多事項！

The order of mixing gypsum powder should also be understood. It is important to add water first and then gypsum powder. It is difficult to mix gypsum powder first and then water gypsum powder very evenly. The hardness of gypsum is proportional to the uniformity of mixing. The more uniform the mixing, the higher the fastness. Follow us http://m.sjzmx.cn Learn more!