石膏粉在装修中有三个主要用途，但每个用途对石膏粉的要求并不相同。用错了地方，轻则浪费材料，重则修补后再次开裂。搞清楚“什么地方用什么石膏”，比买贵的更重要。

Gypsum powder has three main uses in decoration, but each use has different requirements for gypsum powder. Using the wrong place can result in wastage of materials, and in severe cases, it can lead to cracking again after repair. Understanding where to use what gypsum is more important than buying expensive ones.

嵌缝是石膏粉非常“本职”的工作。 石膏板吊顶的接缝处、墙面开槽后的回填缝，都需要用石膏粉填实。嵌缝石膏需要具备一个关键特性：微膨胀。石膏在凝固过程中体积略有膨胀，这恰好抵消了干燥收缩，使嵌缝处不容易开裂。如果嵌缝用了收缩率大的材料（比如普通水泥砂浆），接缝处几乎必然会裂。嵌缝时还要配合接缝纸带或网格布使用——先填石膏，贴上纸带，再刮一层石膏覆盖，形成“石膏+增强材料+石膏”的三明治结构，抗裂效果远优于单纯填缝。

Jointing is the most essential job of gypsum powder. The joints of gypsum board ceiling and the backfill joints after wall slotting need to be filled with gypsum powder. Jointing gypsum requires a key characteristic: slight expansion. Gypsum expands slightly in volume during the solidification process, which precisely offsets the drying shrinkage and makes the joint less prone to cracking. If a material with a high shrinkage rate (such as ordinary cement mortar) is used for joint filling, the joint will almost inevitably crack. When filling seams, it is also necessary to use joint paper tape or mesh cloth - first fill gypsum, stick the paper tape, and then scrape a layer of gypsum cover to form a sandwich structure of "gypsum+reinforcement material+gypsum", which has a much better crack resistance effect than simply filling seams.

阴阳角找直是石膏粉的“精细活”。 毛坯房的墙角往往不直，直接用腻子找直需要批很厚，干燥慢且容易开裂。石膏粉干燥快、强度高，适合用来做“粗找平”。先用石膏粉把墙角大致刮直，干透后再用腻子精细找平。这里的关键是“分层”——一次刮太厚，石膏在凝固过程中会因水化放热而温度升高，内外温差导致开裂。正确的做法是每层厚度控制在5mm以内，等上一层干透再刮下一层。

The straightening of yin and yang corners is a delicate activity of gypsum powder. The corners of rough houses are often not straight, and directly using putty to straighten them requires a thick layer, which dries slowly and is prone to cracking. Gypsum powder dries quickly and has high strength, making it suitable for "rough leveling". First, use gypsum powder to roughly straighten the corner of the wall, and then use putty to finely level it after it dries completely. The key here is "layering" - if one scraping is too thick, the gypsum will increase in temperature during the solidification process due to hydration heat release, and the temperature difference between the inside and outside will cause cracking. The correct approach is to control the thickness of each layer within 5mm and wait for the previous layer to dry before scraping the next layer.

补洞是石膏粉的“力气活”。 墙面上的孔洞、开关插座周围的缝隙，需要用石膏粉填补。小孔洞（直径小于5cm）直接用石膏浆填满刮平即可。大孔洞需要先用碎砖或砂石填充基底，再覆盖石膏层，否则石膏层太厚容易塌陷。补洞时有一个技巧：把孔洞边缘扩成“倒锥形”（里面宽、外面窄），石膏填入后会形成一个“锚固”结构，比直筒形的孔洞更牢固。

Mending holes is a powerful activity of gypsum powder. The holes on the wall and the gaps around the switches and sockets need to be filled with gypsum powder. Small holes (with a diameter less than 5cm) can be directly filled and leveled with gypsum slurry. Large holes need to be filled with broken bricks or sand first, and then covered with a gypsum layer, otherwise the gypsum layer is too thick and prone to collapse. There is a technique for repairing holes: expand the edge of the hole into an "inverted cone" shape (wider inside and narrower outside), and fill it with gypsum to form an "anchoring" structure that is more secure than a straight cylindrical hole.

一个常见的错误：用石膏粉做大面积墙面找平。 石膏粉干燥太快，大面积批刮时，前面刮的还没抹平，后面已经开始硬化。强行继续刮，会把已经硬化的石膏层“拉毛”，表面变得粗糙不平。大面积找平应该用腻子或专门的石膏砂浆，而不是普通石膏粉。石膏粉的正确角色是“局部修补”和“粗找平”，而不是“全屋批刮”。

A common mistake is to use gypsum powder to level large areas of walls. Gypsum powder dries too quickly, and when it is widely scraped, the front part has not been smoothed yet, and the back part has already begun to harden. Forcefully continuing to scrape will "roughen" the already hardened gypsum layer and make the surface rough and uneven. Large area leveling should be done with putty or specialized gypsum mortar, rather than ordinary gypsum powder. The correct role of gypsum powder is "local repair" and "rough leveling", not "whole house scraping".

搞清楚石膏粉的“能力边界”，才能让它发挥非常大价值。嵌缝、找直、补洞，用对石膏粉；大面积找平，交给腻子。各司其职，墙面才能真正平整耐用。

Only by understanding the "capability boundary" of gypsum powder can it maximize its value. Jointing, straightening, and filling holes with gypsum powder; Large area leveling, handed over to putty. Each performs their own duties, only then can the wall be truly smooth and durable.

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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.