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Table 1 The difference between different types of cutting fluids

From: Biological Stability of Water-Based Cutting Fluids: Progress and Application

Type Oil content (%) Particle size (μm) Appearance
Oil-based 100 Transparent
Emulsion 60‒90 >1 Milky
0.1‒1 Milky blue
Semi-synthetic 10‒30 0.05‒0.1 Translucent gray
<0.05 Transparent
Synthetic 0 Transparent