很多室內裝修都會用到石膏粉，因為石膏的可塑性很強。那么您知道石膏粉的優劣勢怎么判斷嗎？我們可以從測定結晶水含量判斷，下面來看看。

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.

濟南石膏粉是一種結晶混合物，其中會含有生石膏、半水石膏和無水石膏(過燒石膏)。在炒制過程中欠火夾生會出現生石膏,或者火大、炒制時間過長造成過燒會出現無水石膏，這些都會影響石膏的凝結時間,影響生產的正常使用。

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.

有時由于石膏粉放置時間過長受潮,也會影響正常使用。根據經驗和資料介紹,通過測定結晶水的含量，可判斷石膏粉質量的好壞。

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.

一般合格的石膏粉結晶水的含量在4.5?5.5%之間若石膏粉的結晶水含量遠低于此標準值,則說明石膏粉過燒,注模時凝結時間太長甚至不凝固;若石膏粉的結晶水含量遠高于此標準值，則說明石膏粉欠火或者受潮,注模時凝結時間短。

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.

以上兩種情況的石膏粉都不合格,在生產中不能使用。

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

檢測石膏粉結晶水含量的方法是：精確稱取4(TC烘干后冷卻至室溫的試樣質量G(—般為2-5g),放置于恒重的鉑金坩堝(或瓷坩堝)中，精確稱取其質量為G1;在230±5°C下灼燒2h，取出移入干燥器內冷卻至室溫后稱取其質量為G2，則其結晶水百分含量為(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%.

此外從外觀上判斷也是一種好方法，通過外觀上觀察和手感可初步判斷石膏粉質量的優劣。就是看石膏粉的外觀顏色，手感就是用手搓一搓石膏粉的糙細程度(細度)。

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.

外觀上看，白度高的石膏粉細度目數高，質量好，價格較高;而發灰發黑、里面有黑色雜質的石膏粉質量較差。用手的拇指和食指搓捻石膏粉,手感發沙粗糙的石膏粉細度糙，質量較差、價格較低;而手感細膩的石音粉說明細度細，質量較好，價格也會較高。

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.

以上就是對石膏粉的優劣勢從測定結晶水含量判斷的介紹，石膏粉的調配是非常重要的。希望以上內容對大家有所幫助。更多內容就來網站http://www.sjzmx.cn咨詢了解吧。

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 http://www.sjzmx.cn Consult and understand.