Oct 24, 2026, 4:00 PM
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PRO302
Made to order
EASYCUT PRO302 Universal Metalworking Coolant, 55 Gallon Drum
PRO302-55Made to order
CA$1,935.29 excl. taxes
Retail price as of 10.24.2026
Retail price as of 10.24.2026
EASYCUT PRO302 is a universal water-miscible semi-synthetic coolant for CNC machining of aluminum, carbon and alloy steel, cast iron and titanium, with yellow metals up to a quarter of the work. Its additive package includes inhibitors made for aluminum, so it can be used on any aluminum alloy. For a shop that cuts a bit of everything, it is the default choice in the EASYCUT range.
Aluminum is where coolants differ most: it smears, builds up on the edge and stains if the chemistry is wrong. In a lab tapping torque test in aluminum, PRO302 needed about 7 % less torque than UNI301, and its peak torque dropped from 70 to 63 Ncm. Lower torque means better lubrication at the edge — cleaner threads and less built-up edge — for a small difference in price.
| Operation | Concentration | Refractometer reading (°Brix) |
|---|---|---|
| Grinding | 4–6 % | 3.1–4.6 |
| Turning, milling — steel, cast iron, titanium | 6–8 % | 4.6–6.2 |
| Turning, milling — aluminum | 7–10 % | 5.4–7.7 |
The refractometer factor is : multiply the °Brix reading by 1.3. In a mixed shop, set the sump for the material you cut most — usually 7–8 % covers both aluminum and steel. Add the concentrate to the water while stirring, or use a , and top up with premixed coolant; the does the arithmetic.
PRO302 forms a stable emulsion in water from 5 to 30 °dH (about 90–530 ppm hardness) and tolerates up to 60 °dH (about 1070 ppm) in service. In water within that range it foams little, which matters on through-spindle and high-pressure systems. A fresh 5 % emulsion has a pH of 9.9.
| Type | Semi-synthetic, water-miscible, with aluminum inhibitors |
| Mineral oil content | about 30 % |
| Viscosity of the concentrate at 20 °C | 125 mm²/s |
| pH of fresh 5 % emulsion | 9.9 |
| Corrosion protection, DIN 51360/2 at 4 % | Degree 0 (no corrosion) |
| Refractometer factor | 1.3 |
| High-pressure coolant (above 40 bar) | Yes |
| Free of | Boric acid, formaldehyde |
| Contains | Secondary amines (DCHA) |
| Shelf life | 12 months unopened, stored at 5–40 °C |
| Origin | Designed in Germany |
The 55-gallon drum is the working size for a shop running PRO302 in its CNC machines: at 7 % it makes about 780 gallons of working coolant, at a lower price per litre than the pail. To try PRO302 in one machine, or for top-ups, take the 5-gallon pail; for central systems and larger shops, the 270-gallon tote has the best price per litre. Small variations in colour between batches are normal. Safe handling is covered in the SDS.
The refractometer factor or Brix factor for CNC fluid concentrate is a multiplier used to convert the refractometer readings (Brix scale) into the actual concentration of the emulsion (concentrate + water).
