TABLE OF CONTENTS
This guide provides an overview of two full synthetic, oil-free metalworking coolant concentrates from Consultant Lubricants, Inc.:
249-SCR Bio-Stable Multi-Purpose Full Synthetic Coolant
4912-TCL Full Synthetic Metalworking Coolant
Both products are designed for CNC machining, grinding, and sawing applications. They are formulated to support long sump life, clean machine performance, operator comfort, and reduced maintenance requirements.
Figure 1. 249-SCR and 4912-TCL full synthetic coolant products.
Product Overview
Full synthetic coolants are oil-free coolant concentrates used to support tool life, cooling performance, corrosion protection, and cleaner machine operation.
The 249-SCR and 4912-TCL are both designed for multi-purpose shop environments, but each product has specific strengths depending on the application.
Product Comparison at a Glance
249-SCR Bio-Stable Multi-Purpose Full Synthetic Coolant
249-SCR is a true oil-free synthetic coolant designed for multi-metal machining and grinding environments. It is used across a wide range of CNC machining and grinding applications and is especially suited for shops that need a clean-running, bio-stable coolant with strong resistance to bacteria and fungus growth.
Figure 2. 249-SCR Bio-Stable Multi-Purpose Full Synthetic Coolant.
Key Benefits
249-SCR provides the following benefits:
Excellent tool life
Clean-running performance
Low foaming
Immediate tramp oil rejection
No slime generation
Long sump life
High operator acceptance
Low biocide levels to help reduce skin irritation
Reduced coolant concentrate consumption as additives remain behind while water evaporates
Multi-purpose formula that can reduce the need for multiple coolant products
Low residue properties to help keep machines cleaner
Residue does not attract chips and swarf
Formulated to resist cobalt leaching when grinding carbide-based materials
Bacteria and Fungus Resistance
249-SCR is formulated for strong resistance to bacteria and fungus growth.
Traditional coolant lubricity additives can act as a food source for bacteria. The chemistry of 249-SCR is less nourishing for bacteria and fungus, helping the coolant stay fresh longer, reduce odor, and lower the need for additional biocides.
Refractometer Readings
Use the following refractometer ranges as a guide when checking 249-SCR concentration on a 0–32 Brix scale.
Note: Refractometer readings should be monitored regularly to keep the coolant within the recommended operating range.
4912-TCL Full Synthetic Metalworking Coolant
4912-TCL is a multi-functional, full synthetic metalworking coolant designed for tool shop environments. It can be used for machining, grinding, and sawing applications in a single oil-free product.
This coolant is designed for clean performance, corrosion protection, low odor, and long sump life.
Figure 3. 4912-TCL Full Synthetic Metalworking Coolant.
Key Benefits
4912-TCL provides the following benefits:
Cooler-running process
Excellent tool life
Clean operation inside and outside the machine
Low foaming
Excellent corrosion protection
Immediate tramp oil rejection
Resistance to bacteria, fungus, and mold growth
Potential for 1+ year sump life with proper maintenance
Odor-free operation for high operator acceptance
Maintains concentration longer because additives are not consumed during the process
Wet-out formula helps reduce drag-out and carry-off on chips and parts
Dried films reconstitute immediately on startup and rejoin the coolant mixture
Low residue properties
Dried residue does not attract chips and swarf
Refractometer Readings
Use the following target readings and ranges when checking 4912-TCL concentration.
Note: If the refractometer reading is below the target, add coolant concentrate. If the reading is above the target, add water. During use, readings may rise as water evaporates and sump volume drops. Add tap water as needed to restore the coolant to the target range.
Water Source
Tap water of any hardness may be used for charge-up and makeup.
4912-TCL is treated to soften water, helping prevent scale, cloudiness, and clogged coolant delivery lines.
Startup Concentration
To determine the amount of new coolant needed for initial startup, divide the total sump volume by 6.
Example:
A 30-gallon sump requires:
30 gallons ÷ 6 = 5 gallons of 4912-TCL
After adding the coolant concentrate, fill the remaining volume with tap water.
Makeup Concentration
If using an automated mixer, add makeup coolant at 1/4 to 1/2 of the target reading.
This helps maintain the proper coolant range and compensate for evaporation during normal use.
Sump Cleaner and Sanitizing Instructions
These instructions apply to initial startup only.
Before changing over to fresh 4912-TCL coolant, divide the total sump volume by 20 to determine the number of gallons of 0184-SCS Sump Cleaner & Sanitizer to add to the existing coolant.
Add the sump cleaner and sanitizer 3–4 days before changeover.
After the treatment period:
Drain the sump.
Add fresh rinse water with pumps running.
Drain the rinse water.
Recharge the sump with fresh water and new 4912-TCL coolant.
Important: The sump should be properly cleaned and rinsed before adding fresh coolant. This helps support coolant performance, sump life, and machine cleanliness.
Final Coolant Notes
Before using or maintaining coolant, confirm the following:
The correct coolant is being used for the application.
Refractometer readings are checked regularly.
Coolant concentration is kept within the recommended range.
Water is added when readings are above target.
Coolant concentrate is added when readings are below target.
The sump is cleaned properly during changeover.
Makeup concentration is adjusted as needed to compensate for evaporation.
Operators monitor for odor, foaming, residue, or unusual machine conditions.
Recommendation: Keep a coolant maintenance log for each machine. Record the coolant type, sump volume, refractometer readings, makeup additions, water additions, cleaning dates, and any observations during use.
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