金きん属ぞく石せっ鹸けん

noun

metallic soap; soap scum

Technical term for a metal salt of a fatty acid, used in lubricants, stabilizers, etc. Also refers to the insoluble residue (soap scum) formed when soap reacts with hard water minerals.

• 金きん属ぞく石せっ鹸けんはプラスチックの安あん定てい剤ざいとして使つかわれる。

  Metallic soaps are used as stabilizers in plastics.

• 硬こう水すいでは石せっ鹸けんが金きん属ぞく石せっ鹸けんになって沈ちん殿でんする。

  In hard water, soap turns into metallic soap and precipitates.