有些朋友问，为什么制作的地台、模具会开裂？主要原因是选用了不适当的石膏粉。下面来讲讲调配济南石膏粉时的凝固时间掌握内容。

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.

凝固时间主要与加水量有关系（添加剂另外说明），次之与搅拌时间、浇铸容器、温度、湿度有关系。

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，水越多石膏凝结时间越长，石膏密度越低、牢度越低，水越少凝结时间越短、密度越大、牢度越高，具体需根据使用需求来控制。

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.

然后谈下搅拌时间，一般而言搅拌到石膏粉非常均匀即可浇铸，一般控制在5分钟之内，搅拌时间越长，石膏粉凝固时间越快。浇铸容器与凝固时间的关系，浇铸入不吸水的容器内（硅胶模具等）铸型凝固时间不变，浇铸入吸水的容器内（比如纸盒、木盒等），凝固时间缩短。

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.).

这个比较好理解，石膏粉内的水粉被模具吸收，当然凝固时间缩短。温度、湿度与凝固关系，气温越高凝固时间越短，气温越低凝固时间越长，湿度越高凝固时间越长，湿度越低凝固时间越短。

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.

调配石膏粉次序也要明白，先加水后加石膏粉，切记这点很重要，先粉后水石膏粉很难搅拌到非常均匀，石膏的硬度与搅拌的均匀程度是成正比的，搅拌越均匀，牢度越高。关注我们//www.gochiism.com了解更多事项！

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 //www.gochiism.com Learn more!