Monroe Fluid Technology



Biostable semi-synthetic cutting and grinding fluid

ASTRO-CUT BCL is a semi-synthetic biostable general purpose metalworking coolant containing approximately 20% mineral oil. This product, when diluted with water, forms a translucent amber emulsion which offers excellent workpiece visibility, good lubricity, and superior cooling. ASTRO-CUT BCL is designed for the machining and grinding of virtually all metals, except magnesium, and contains chlorine as an extreme pressure additive for greater lubricity.

Part No. Quantity
37-050 5 Gallon Pail
37-104 1 Gallon Bottle

BIOSTABILITY refers to the ability of a metalworking coolant to resist extreme biological degradation. This provides extremely long sump life in a properly maintained machine tool and diminishes the possibility of "Monday Morning Odor".
Designed for use in metalworking applications such as all CNC milling, turning, drilling, tapping, and grinding. ASTRO-CUT BCL is also excellent on conventional machining processes and sawing applications.
  • Eliminates Need for Tankside Additives
  • Superior Tramp Oil Rejection
  • Low Foaming
  • Operator Friendly
  • Mild, Pleasant Odor
  • Excellent Lubricity
  • Excellent Corrosion Inhibition
  • Clean Running
  • Excellent Hard Water Stability
  • Provides Excellent Finish
  • Good Workpiece Visibility-Translucent
  • Long Lasting
  • Appearance - concentrate:
Amber Liquid
  • Appearance - dilution:
Translucent Amber
  • Odor:
  • Residual Film:
Soft, Fluid
  • pH @ 20:1:
(5 %) 9.0 + 0.2
  • Specific Gravity @ 60° F.
1.0 + 0.01
  • Lbs./Gal.
8.33 ± 0.1
  • Total Chlorine. wt %
  • Flash Point, PMCC, ° F.
Concentration - ASTRO-CUT BCL:
  • Concentration:
4% (1:25) 5% (1:20) 6% (1:17) 7% (1:14) 8% (1:12) 9% (1:11) 10% (1:10)
  • Refractometer Reading:
2.1 2.6 3.1 3.6 4.2 4.7 5.2
An optical refractometer may be used for determining concentration. These numbers are typical and are not to be construed as specifications.
Recommended Starting Dilutions:
  • Centerless, ID, OD, Surface Grinding:
25:1 (4%)
  • Milling, Drilling, Turning:
20:1 (5%)
  • Tapping, Reaming, Sawing:
10:1 (10%)
When mixing coolant, it is best to use an automatic proportioner which accurately and thoroughly mixes coolant. Always replenish the coolant with a mixture of coolant and water, not just coolant or water. Never add coolant concentrate directly to the sump.

IMPORTANT! At concentrations below 4%, the biostability of this product may be compromised, leading to much shorter sump life. To insure maximum coolant life, sump should be thoroughly cleaned and neutralized using ASTRO-CLEAN A prior to charging machine with ASTRO-CUT BCL.
View Monroe Fluid Technology's Website for Product Data Sheet and MSDS
The information presented on this page is for informational purposes only. Please ensure the accuracy of the data from the manufacturer's Product Data Sheet and Material Safety Data Sheets listed above.

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