The setting time of gypsum powder generally depends on the grade of gypsum powder. Those with high grade generally set fast. The reaction speed between gypsum powder and water is very fast. The general operation time is only a few minutes. The gypsum powder will be sprinkled into the water in 1 minute, stirred in 2 minutes and inverted in 3 minutes, and will soon harden.

一、 建筑石膏粉：在装修粉刷过程中，需要延长石膏粉的凝固时间。不过让石膏凝固速度降慢的方法是在把石膏粉加水的时候使用温度较低的凉水，水越凉凝固速度越慢，反之用热水会很快。如果觉得这个办法不行，还可以加入柠檬酸或者先在石膏粉里掺好腻子粉，在水里掺上108胶白乳胶和纤维素，再调和。

1、 Building gypsum powder: in the process of decoration and painting, it is necessary to extend the setting time of gypsum powder. However, the way to slow down the setting speed of gypsum is to use cold water with lower temperature when adding water to gypsum powder. The cooler the water is, the slower the setting speed is. On the contrary, using hot water will be fast. If you think this method doesn't work, you can also add citric acid or mix putty powder in gypsum powder, 108 glue white latex and cellulose in water, and then mix.

二、 模具石膏粉：如果硬化速度过快，可以往水中加些缓凝剂，如：乙醇(酒精)约占百分之6-8，可以延长操作时间。一般的模型，使用建筑石膏粉或高度石膏粉。如果铸模用，那需要专门的石膏铸粉。另外需要注意石膏粉与水的比例，水的多少直接影响石膏模的质量。

2、 Mold gypsum powder: if the hardening speed is too fast, some retarders can be added to the water. For example, ethanol (alcohol) accounts for about 6-8%, which can prolong the operation time. The general model uses building gypsum powder or high gypsum powder. If the mold is used, special gypsum casting powder is required. In addition, attention should be paid to the ratio of gypsum powder to water. The amount of water directly affects the quality of gypsum mold.

建筑石膏粉如何使用凝固后不开裂

How to use building gypsum powder without cracking after solidification

石膏粉的使用也是有技巧的，特别是石膏粉的凝固时间的掌握：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。首先水、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。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。

The use of gypsum powder is also skilful, especially the mastery of the setting time of gypsum powder: the setting time is mainly related to the amount of water added (additives are otherwise specified), followed by the mixing time, casting container, temperature and humidity. Firstly, 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. The specific needs to be controlled according to the use requirements. Then let's talk about the mixing time. Generally speaking, the gypsum powder can be cast after mixing until it is very uniform. It is generally controlled within 5 minutes. The longer the mixing time, the faster the solidification time of gypsum powder.

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