Cutting-Fluid Concentration
The running concentration of a coolant sump from a refractometer Brix reading and the fluid's factor.
Example
You enter
- Refractometer Brix 3
- Refractometer factor 2
- Sump volume (gal) 50
- Target concentration (%) 8
You get
- Current concentration 6%
- Add (gal) 1.09
Checked against published worked examples from: Coolant Consultants, Inc.
Details, formula, and sources
ScopeThe running concentration of a coolant sump from a refractometer Brix reading and the fluid's factor, and the concentrate to add (or water to add) to bring it to a target.
Formula or tableConcentration % = Brix x refractometer factor; add concentrate = sump x (target - current) / (100 - target); add water = sump x (current - target) / target.
Source and editionMetalworking-fluid refractometer method (by name).
Free accessRefractometer factor and the maintenance range free on the coolant data sheet.
What governsEstimate. AHJ and licensed professional govern.
API field namesbrix_reading, refractometer_factor, sump_volume_gal, target_pct, current_pct, add_gal
- Maintenance range often ~6-10% for general machining; factor usually 1-4 (off the data sheet)coolant data sheet