PROBLEM TO BE SOLVED: To provide an inexpensive gypsum dissolution liquid capable of dissolving deposited gypsum without causing damage to containers, tools or the like for mixing, application, or processing, the gypsum dissolution liquid solving the problem in which many of the conventional gypsum dissolution liquid agents are alkaline solution whose pH is 8 or more, and pH of some removers is 13 or more, and they are safer for operators than strong acids, decreasing the risk of corroding stainless steel materials, but there is a risk of corroding containers, tools or the like made of non-ferrous metal such as aluminium which is vulnerable to alkali.SOLUTION: The gypsum dissolution agent contains chelating agent, organic acid, alkali agent, and water, and has a pH of 7.5-8.0.COPYRIGHT: (C)2014,JPO&INPIT【課題】 従来の石膏溶解液剤の多くは、pH8以上のアルカリ性溶液であり、一部の除去剤はpH13を超えるものもある、作業者の安全面は強酸類よりも優れ、ステンレス材の腐食の危険は少なくなるものの、アルカリに弱いアルミニウム等の非鉄金属製の容器、器具類を腐食する恐れがある。そこで混練、塗布、加工する容器、器具類を傷めずに、付着する石膏を溶解できる、安価な石膏溶解液を提供する。【解決手段】 キレート剤、有機酸、アルカリ剤、水を有し、pHが7.5~8.0であるもの。【選択図】 図1
