一、材質分類：按需選擇的 “功能細分”

1、 Material classification: "Functional subdivision" selected as needed

濟南石膏粉根據純度和用途，主要分為三大類：

Jinan gypsum powder is mainly divided into three categories based on purity and usage:

建筑用石膏粉

Gypsum powder for construction

純度約 80%-90%，含有少量雜質，凝固速度中等，硬度適中，適合墻面修補、石膏板生產等對精度要求不高的場景。包裝上常標注 “建筑專用” 或 “裝修用”，價格較為親民，是家庭和工地的常用款。

Purity of about 80% -90%, containing a small amount of impurities, moderate solidification speed, moderate hardness, suitable for scenarios with low precision requirements such as wall repair and gypsum board production. The packaging is often labeled as "for construction purposes" or "for decoration purposes", and the price is relatively affordable, making it a common choice for households and construction sites.

高強石膏粉

High strength gypsum powder

純度 95% 以上，經過特殊煅燒工藝，凝固后硬度更高（可達莫氏硬度 3-4 級），適合制作模具、雕塑等需要承重或精細造型的場景。這種石膏粉的顆粒更細，加水后流動性好，能填充模具的細微凹槽，成品表面光滑無氣孔。

Purity of over 95%, after special calcination process, the hardness is higher after solidification (up to 3-4 levels of Mohs hardness), suitable for making molds, sculptures and other scenes that require load-bearing or fine shaping. This gypsum powder has finer particles, good flowability after adding water, and can fill the fine grooves of the mold. The finished product surface is smooth and free of pores.

特種石膏粉

Special gypsum powder

針對特殊需求添加外加劑，如防水石膏粉（用于衛生間墻面，減少水汽侵蝕）、快干石膏粉（10 分鐘內凝固，適合緊急修補）、食品級石膏粉（用于豆腐制作的凝固劑，純度和安全性要求極高）。

Add additives for special needs, such as waterproof gypsum powder (used for bathroom walls to reduce water vapor erosion), fast drying gypsum powder (solidifies within 10 minutes, suitable for emergency repairs), and food grade gypsum powder (used as a coagulant for tofu production, with extremely high purity and safety requirements).

二、選購石膏粉的實用建議

2、 Practical Suggestions for Choosing Gypsum Powder

1. 根據用途選 “類型”

1. Select "type" based on the purpose

墻面修補、石膏線安裝：選普通建筑用石膏粉，凝固速度適中，成本低。

Wall repair and gypsum line installation: Choose ordinary building gypsum powder with moderate solidification speed and low cost.

模具制作、雕塑創作：選高強石膏粉，硬度高、表面細膩，避免成品開裂或粗糙。

Mold making and sculpture creation: Choose high-strength gypsum powder with high hardness and delicate surface to avoid cracking or roughness of the finished product.

潮濕環境使用：選標注 “防水” 或 “防潮” 的特種石膏粉，防止凝固后吸水軟化。

Use in humid environments: Select special gypsum powder labeled as "waterproof" or "moisture-proof" to prevent it from absorbing water and softening after solidification.

2. 關注 “純度與雜質”

2. Pay attention to "purity and impurities"

優質石膏粉呈均勻的白色，無明顯泛黃或灰斑，雜質少（如黑色顆粒、結塊）。取少量粉末溶于水，靜置后沉淀少，說明純度高，適合對強度和細膩度要求高的場景。

High quality gypsum powder is uniformly white, without obvious yellowing or gray spots, and has few impurities (such as black particles and clumps). Dissolve a small amount of powder in water and let it settle for a while, indicating high purity and suitability for scenarios that require high strength and fineness.

建筑用石膏粉允許少量雜質，但結塊嚴重、有刺鼻氣味的產品可能煅燒工藝不佳，凝固后強度不足，需避免購買。

Gypsum powder for construction is allowed to contain a small amount of impurities, but products with severe agglomeration and pungent odor may have poor calcination process and insufficient strength after solidification, and should be avoided from purchase.

3. 查看 “包裝與標識”

3. View "Packaging and Labeling"

正規產品包裝上應標注主要成分、用途、凝固時間、保質期（通常 6-12 個月）。注意生產日期，超過保質期的石膏粉可能凝固速度變慢或強度下降。

Regular product packaging should indicate the main ingredients, purpose, solidification time, and shelf life (usually 6-12 months). Pay attention to the production date, gypsum powder that has exceeded its shelf life may have a slower solidification rate or a decrease in strength.

工業用或特種石膏粉需確認是否符合相關標準（如食品級需有衛生許可標識），避免誤用帶來安全隱患。

Industrial or special gypsum powder needs to be confirmed to comply with relevant standards (such as food grade requiring hygiene license labeling) to avoid potential safety hazards caused by misuse.

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