石膏粉質量好壞，直接決定墻面抹灰會不會空鼓、石膏板會不會開裂。以下4招，幫你從外觀到手感，挑出優(yōu)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：看顏色——白度高=純度高。 白度高的石膏粉細度目數(shù)高、質量好、價格也高。發(fā)灰發(fā)黑、里面有黑色雜質的石膏粉質量較差。顏色主要有灰色、黃色和白色三種?；疑喾垡话阌糜诖蟛糠纸ㄖ?。選白色、無雜質的，純度更高、性能更穩(wěn)。

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：摸細度——越細越好。 特硬白石膏的細度約1100目，建筑石膏約300目。細度越高，與水接觸面積越大，水化反應越充分，強度越高。用手捻一下，優(yōu)良石膏粉細膩滑潤，劣質的粗糙有顆粒感。如果石膏粉浸水后能看到黑色小顆粒，說明雜質多、石膏比較脆、價格便宜。

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：看原料來源——天然礦石優(yōu)于工業(yè)副產。 優(yōu)先選擇以天然石膏礦石為原料的石膏粉。脫硫石膏、磷石膏等工業(yè)副產石膏雖然也可用，但性能穩(wěn)定性不如天然石膏。天然石膏不含過多化學成分，不會添加對人體有害的產品。

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：查標準等級——優(yōu)等品、一等品、合格品差很多。 建筑石膏按技術要求分為優(yōu)等品、一等品和合格品三個等級。主要考核強度、細度和凝結時間。等級越高，強度越高、性能越穩(wěn)定。根據(jù)GB/T 9776標準，按2小時濕抗折強度分為4.0、3.0、2.0三個等級。3.0級建筑石膏抗折強度≥3.0MPa，抗壓強度≥6.0MPa。2.0級抗折強度≥2.0MPa，抗壓強度≥4.0MPa。選等級高的，別為了省幾塊錢買合格品。

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.

簡單總結：看顏色——白的好；摸細度——細的好；問來源——天然的好；查等級——高的好。四條都符合的石膏粉，放心買。

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.

本文由濟南石膏粉友情奉獻.更多有關的知識請點擊:http://www.wavc.cn真誠的態(tài)度.為您提供為多維度的服務.更多有關的知識我們將會陸續(xù)向大家奉獻.敬請期待.

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