很多室内装修都会用到石膏粉，因为石膏的可塑性很强。那么您知道石膏粉的优劣势怎么判断吗？我们可以从测定结晶水含量判断，下面来看看。

Many interior decoration will use gypsum powder, because gypsum has strong plasticity. Do you know how to judge the advantages and disadvantages of gypsum powder? We can judge from the determination of crystal water content. Let's have a look.

济南石膏粉是一种结晶混合物，其中会含有生石膏、半水石膏和无水石膏(过烧石膏)。在炒制过程中欠火夹生会出现生石膏,或者火大、炒制时间过长造成过烧会出现无水石膏，这些都会影响石膏的凝结时间,影响生产的正常使用。

Jinan gypsum powder is a crystalline mixture, which contains raw gypsum, hemihydrate gypsum and anhydrous gypsum (burned gypsum). In the process of frying, raw gypsum will appear in the process of under fire, or anhydrous gypsum will appear in the process of over heating due to high fire and long frying time, which will affect the setting time of gypsum and the normal use of production.

有时由于石膏粉放置时间过长受潮,也会影响正常使用。根据经验和资料介绍,通过测定结晶水的含量，可判断石膏粉质量的好坏。

Sometimes, gypsum powder will be affected by moisture due to its long storage time, which will also affect its normal use. According to experience and information, the quality of gypsum powder can be judged by measuring the content of crystal water.

一般合格的石膏粉结晶水的含量在4.5?5.5%之间若石膏粉的结晶水含量远低于此标准值,则说明石膏粉过烧,注模时凝结时间太长甚至不凝固;若石膏粉的结晶水含量远高于此标准值，则说明石膏粉欠火或者受潮,注模时凝结时间短。

Generally, the content of qualified gypsum powder crystal water is 4.5? Between 5.5%, if the crystal water content of gypsum powder is far lower than this standard value, it indicates that the gypsum powder is burned, and the setting time is too long or even does not solidify during injection molding; If the crystal water content of gypsum powder is much higher than this standard value, it indicates that gypsum powder is under fire or damp, and the setting time is short during injection molding.

以上两种情况的石膏粉都不合格,在生产中不能使用。

The gypsum powder in the above two cases is unqualified and cannot be used in production.

检测石膏粉结晶水含量的方法是：精确称取4(TC烘干后冷却至室温的试样质量G(—般为2-5g),放置于恒重的铂金坩埚(或瓷坩埚)中，精确称取其质量为G1;在230±5°C下灼烧2h，取出移入干燥器内冷却至室温后称取其质量为G2，则其结晶水百分含量为(Gt—G2)/GX100%。

The method to detect the crystal water content of gypsum powder is: accurately weigh 4 (the mass g of the sample cooled to room temperature after TC drying (generally 2-5g), place it in a platinum crucible (or porcelain crucible) with constant weight, and accurately weigh its mass as G1; Burn it at 230 ± 5 ° C for 2h, take it out and move it into a dryer to cool it to room temperature, and then weigh its mass as G2, then the percentage content of crystal water is (gt-g2) /gx100%.

此外从外观上判断也是一种好方法，通过外观上观察和手感可初步判断石膏粉质量的优劣。就是看石膏粉的外观颜色，手感就是用手搓一搓石膏粉的糙细程度(细度)。

In addition, judging from the appearance is also a good method. The quality of gypsum powder can be preliminarily judged by observing the appearance and feeling. It depends on the appearance and color of gypsum powder. The feel is to rub the roughness (fineness) of gypsum powder with your hands.

外观上看，白度高的石膏粉细度目数高，质量好，价格较高;而发灰发黑、里面有黑色杂质的石膏粉质量较差。用手的拇指和食指搓捻石膏粉,手感发沙粗糙的石膏粉细度糙，质量较差、价格较低;而手感细腻的石音粉说明细度细，质量较好，价格也会较高。

In appearance, gypsum powder with high whiteness has high fineness, mesh number, good quality and high price; The gypsum powder with grey and black hair and black impurities inside is of poor quality. Twist the gypsum powder with the thumb and index finger of the hand. The gypsum powder that feels Sandy and rough has rough fineness, poor quality and low price; The stone tone powder with fine hand feel shows that it has fine fineness, good quality and high price.

以上就是对石膏粉的优劣势从测定结晶水含量判断的介绍，石膏粉的调配是非常重要的。希望以上内容对大家有所帮助。更多内容就来网站//www.gochiism.com咨询了解吧。

The above is the introduction of the advantages and disadvantages of gypsum powder from the determination of crystal water content. The deployment of gypsum powder is very important. I hope the above content is helpful to you. Come to the website for more information //www.gochiism.com Consult and understand.