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**FUCHS ECOCOOL REX 21** is a high-performance, semi-synthetic, water-miscible metalworking fluid supplied in a **10-liter container (10 L)**. Suitable for a wide range of cutting and grinding operations on cast iron, steel, and aluminum alloys, it forms a stable emulsion across various water hardness levels, provides excellent cooling and multi-metal corrosion protection, and features low foaming properties to keep machine tools and work areas clean.