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The classification standards of emulsification grade
| Grade | Degree of emulsification | Droplet size (nm) | Transmittance (%) | Appearance |
|---|---|---|---|---|
| A | Excellent | <100 | >95 | Clear and transparent |
| B | Good | 100–300 | 90–95 | Slightly less clear |
| C | Fair | 300–500 | 75–90 | Bluish white |
| D | Poor | >500 | <75 | Milky |
