Plaster Investment vs Ceramic Shell: How to Choose
石膏型 vs 陶瓷壳：如何选型
标签：选型, 石膏型, 陶瓷壳, 对比
选石膏型还是陶瓷壳，取决于件重、细节与产量。石膏型将石膏+硅粉（或石英粉）混合后整体灌注，一次成型、细节极好，适合 <1.5 kg 的首饰与小型摆件，但透气性差、只宜低温合金（铜/银/金，熔点 <1200℃）。陶瓷壳采用逐层挂浆（粘结剂+耐火砂）反复 6–12 次，壳薄透气、耐温高，适合 >1 kg 的雕塑与批量件，可上真空或离心。自检：单件 <500 g 且要锐利纹饰 → 石膏型；大件、需批量或高温合金 → 陶瓷壳。
Choose between plaster and ceramic shell by weight, detail, and volume. Plaster investment is a single pour of gypsum + silica (or quartz) flour, capturing superb detail, ideal for jewelry and small objects under ~1.5 kg — but it has poor permeability and suits only low-temperature alloys (Cu/Ag/Au, melt <1200°C). Ceramic shell is built by repeatedly dipping (binder + refractory sand) 6–12 times; the thin, permeable, heat-resistant shell fits sculptures over 1 kg and production runs, and supports vacuum or centrifugal casting. Rule of thumb: under 500 g with crisp detail → plaster; large, batch, or high-temp alloy → ceramic shell. ---