石膏粉质量好坏，直接决定墙面抹灰会不会空鼓、石膏板会不会开裂。以下4招，帮你从外观到手感，挑出优良石膏粉。

The quality of gypsum powder directly determines whether the wall plastering will be hollow and whether the gypsum board will crack. Here are four tips to help you pick out high-quality gypsum powder from appearance to texture.

第一招：看颜色——白度高=纯度高。 白度高的石膏粉细度目数高、质量好、价格也高。发灰发黑、里面有黑色杂质的石膏粉质量较差。颜色主要有灰色、黄色和白色三种。灰色石膏粉一般用于大部分建筑上。选白色、无杂质的，纯度更高、性能更稳。

The first trick: Look at the color - high whiteness=high purity. Gypsum powder with high whiteness has high fineness, good quality, and high price. Gypsum powder with grayish black color and black impurities inside has poor quality. There are mainly three colors: gray, yellow, and white. Grey gypsum powder is generally used in most buildings. Choose white, impurity free, with higher purity and more stable performance.

第二招：摸细度——越细越好。 特硬白石膏的细度约1100目，建筑石膏约300目。细度越高，与水接触面积越大，水化反应越充分，强度越高。用手捻一下，优良石膏粉细腻滑润，劣质的粗糙有颗粒感。如果石膏粉浸水后能看到黑色小颗粒，说明杂质多、石膏比较脆、价格便宜。

Second move: Touch the fineness - the finer the better. The fineness of ultra hard white gypsum is about 1100 mesh, and that of building gypsum is about 300 mesh. The higher the fineness, the larger the contact area with water, the more complete the hydration reaction, and the higher the strength. Twist it by hand, high-quality gypsum powder is delicate and smooth, while inferior ones are rough and have a grainy texture. If black small particles can be seen after soaking gypsum powder in water, it indicates that there are many impurities, gypsum is relatively brittle, and the price is cheap.

第三招：看原料来源——天然矿石优于工业副产。 优先选择以天然石膏矿石为原料的石膏粉。脱硫石膏、磷石膏等工业副产石膏虽然也可用，但性能稳定性不如天然石膏。天然石膏不含过多化学成分，不会添加对人体有害的产品。

The third trick: Look at the source of raw materials - natural ore is better than industrial by-products. Priority should be given to gypsum powder made from natural gypsum ore. Although industrial by-products such as desulfurization gypsum and phosphogypsum can also be used, their performance stability is not as good as natural gypsum. Natural gypsum does not contain excessive chemical components and does not add harmful products to the human body.

第四招：查标准等级——优等品、一等品、合格品差很多。 建筑石膏按技术要求分为优等品、一等品和合格品三个等级。主要考核强度、细度和凝结时间。等级越高，强度越高、性能越稳定。根据GB/T 9776标准，按2小时湿抗折强度分为4.0、3.0、2.0三个等级。3.0级建筑石膏抗折强度≥3.0MPa，抗压强度≥6.0MPa。2.0级抗折强度≥2.0MPa，抗压强度≥4.0MPa。选等级高的，别为了省几块钱买合格品。

The fourth trick: Check the standard level - there are many differences between excellent products, first-class products, and qualified products. Architectural gypsum is divided into three grades according to technical requirements: superior, first-class, and qualified. The main assessment includes strength, fineness, and setting time. The higher the level, the higher the strength and the more stable the performance. According to the GB/T 9776 standard, the 2-hour wet flexural strength is divided into three levels: 4.0, 3.0, and 2.0. The flexural strength of 3.0 grade building gypsum is ≥ 3.0MPa, and the compressive strength is ≥ 6.0MPa. Grade 2.0 flexural strength ≥ 2.0MPa, compressive strength ≥ 4.0MPa. Choose higher grades, don't buy qualified products just to save a few dollars.

简单总结：看颜色——白的好；摸细度——细的好；问来源——天然的好；查等级——高的好。四条都符合的石膏粉，放心买。

Summary: Look at the color - white is better; Touch fineness - fine is good; Ask the source - natural goodness; Check the level - high is good. Buy gypsum powder that meets all four criteria with confidence.

本文由济南石膏粉友情奉献.更多有关的知识请点击:https://www.jnfhjc.com真诚的态度.为您提供为多维度的服务.更多有关的知识我们将会陆续向大家奉献.敬请期待.

This article is a friendly contribution from Jinan gypsum powder For more information, please click: https://www.jnfhjc.com Sincere attitude To provide you with comprehensive services We will gradually contribute more relevant knowledge to everyone Coming soon.