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 |