Plaster Master Mould Recipe
石膏母模快速拓纹配方
标签：石膏,半水石膏,初凝,一次性,透气
以 α 半水石膏（高强石膏）100 份加水 60–70 份，搅匀后 3 分钟内浇注于原样，30–60 分钟初凝脱模。石膏模透气好、成本低，适合一次性大件拓纹；缺点是脆性大、不可复用，且不宜直接浇高温金属。
Mix high-strength α hemihydrate plaster 100 parts with water 60–70 parts, pour within 3 min, demould after 30–60 min set. Plaster is breathable and cheap for one-off large textures; downsides are brittleness, single use, and unsuitability for direct high-temperature casting.