Gas sand - Gasusuna

...In recent years, various self-hardening molds have been developed that use inorganic or organic binders such as water glass, cement, and synthetic resin instead of clay, and harden in a short time using the action of catalysts, etc. The _CO2 process (carbon dioxide type), also known as gas sand, is a molding sand mixed with sodium silicate that is hardened by passing carbon dioxide gas through it. Although it is not strictly self-hardening, it is included in this category in the table. In addition, a reduced-pressure molding method (V process) has been put into practical use that does not use any binder at all, but instead uses a thin film attached to the model surface to reduce the air between the sand grains to create a mold. ...

*Some of the terminology that refers to "gas sand" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…近年，粘土分の代りに，水ガラス，セメント，合成樹脂などの無機質，有機質の粘結剤を使い，触媒などの作用で短時間で硬化させる自硬性鋳型が種々開発されている。CO₂プロセス(炭酸ガス型)は，ガス砂とも呼ばれ，ケイ酸ソーダを配合した鋳物砂に炭酸ガスを通して硬化させるもので，厳密には自硬性ではないが表ではこの区分に入れた。また，粘結剤をまったく使わず，模型表面に密着させた薄膜を利用し砂粒間の空気を減圧して造型する減圧造型法(Vプロセス)が実用化されている。…

※「ガス砂」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報