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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