TRUEGARD Syncool 428 -275 GALLON TOTE

When properly diluted, Syncool 428 is suitable for most machining operations on both ferrous metals (such as steel and cast iron) and nonferrous metals (such as aluminum, brass, and copper). Its combination of extreme pressure additives and chemical lubricity makes it effective across a wide range of cutting, turning, milling, and grinding tasks.

The refractometer factor of 3.6 means you multiply your target concentration percentage by 3.6 to get the expected refractometer reading. For example, if you are running a 5% solution, your refractometer should read approximately 18 Brix (5 × 3.6 = 18), allowing you to accurately monitor and maintain the correct dilution in your sump.

No. Syncool 428 is inherently low foaming, so neither silicone defoamers nor heavy cream-type defoamers are needed. This is especially important because silicone defoamers can cause fish-eyeing defects on steel surfaces, a problem this product avoids by design.

The fungicide formulation inhibits microbial growth that would otherwise degrade the coolant, cause foul odors, and reduce lubricity over time. This extends the service life of the coolant in the sump, meaning less frequent fluid changes and more consistent machining performance.

By reducing surface tension, Syncool 428 allows the coolant to thoroughly wet all machining surfaces rather than beading up. This improves contact between the fluid and the work zone, which increases the rate of heat removal and helps both the cutting tool and workpiece stay cooler, directly contributing to better tool life and improved surface finish.

Syncool 428 is a concentrate that must be diluted with water before use. The appropriate dilution ratio depends on the specific machining operation; using a refractometer in combination with the published refractometer factor of 3.6 allows you to verify that the mixed solution is at the correct working concentration.