Gypsum powder and putty powder are not the same material. Gypsum powder is mainly used for caulking, filling holes and straightening internal and external corners. Its particles are rough, hard after setting, difficult to polish and fast setting speed. Putty powder is mainly used for priming, slow setting speed, soft texture after setting, and easy to polish with sandpaper. It is a better priming material before brushing latex paint.

石膏粉通常為白色、無色，無色透明晶體稱為透石膏，有時因含雜質而成灰、淺黃、淺褐等色。條痕白色。透明。玻璃光澤，解理面珍珠光澤，纖維狀集合體絲絹光澤。解理極完全，和中等，解理片裂成面夾角為66和114的菱形體。性脆。硬度1.5~2。

Gypsum powder is usually white, colorless, colorless and transparent crystal, which is called transparent gypsum. Sometimes it is gray, light yellow, light brown and other colors due to impurities. The stripes are white. Transparency. Glass luster, cleavage surface pearl luster, fibrous aggregate silk luster. The cleavage is very complete and medium. The cleavage slices are divided into rhomboids with angles of 66 and 114. It's brittle. The hardness is 1.5 ~ 2.

不同方向稍有變化。相對密度2.3。石膏粉是五大凝膠材料之一，在國民經濟中占有重要的地位，廣泛用于建筑、建材、工業模具和藝術模型、化學工業及農業、食品加工和醫藥美容等眾多應用領域，是一種重要的工業原材料。

Slightly different in different directions. The relative density is 2.3. Gypsum powder is one of the five major gel materials. It plays an important role in the national economy. It is widely used in building, building materials, industrial molds and art models, chemical industry and agriculture, food processing and medical beauty, and so on. It is an important industrial raw material.

膩子粉是建筑裝飾材料的一種，主要成分是滑石粉和膠水。 剛剛購置的毛坯房表面的一層白色——膩子，通常膩子的白度在90以上細度在330以上。膩子是用來墻面修補找平的一種基材，為下一步裝飾(刷油漆貼壁紙)打下良好的基礎。

Putty powder is a kind of building decoration materials, the main components are talcum powder and glue. Just bought a layer of white on the surface of the blank room - putty, usually the whiteness of putty is more than 90, fineness is more than 330. Putty is a kind of base material used to repair and level the wall, which lays a good foundation for the next decoration (painting and wallpaper).

膩子分為內墻和外墻兩種，外墻膩子要抵抗風吹日曬所以膠性大、強度高，環保指數稍低。內墻膩子綜合指數較好，健康環保，所以內墻不外用，外墻不內用。通常膩子是石膏或者水泥基的，這樣表面粗糙比較容易粘接牢固。但是在施工的時候還是要在基層上涂刷一層界面劑來封固基層同時提高墻面的附著力，讓膩子能夠更好的粘結在基面上。

Putty can be divided into interior wall and exterior wall. Exterior wall putty is resistant to wind and sun, so it has high gel, high strength and low environmental protection index. The composite index of interior wall putty is good, healthy and environmental protection, so the interior wall is not for external use, and the exterior wall is not for internal use. Usually putty is gypsum or cement-based, so the surface is rough and easy to bond firmly. But in the construction, we should brush a layer of interface agent on the base to seal the base, and improve the adhesion of the wall, so that the putty can be better bonded on the base.