Oct 31, 2026, 2:10 PM
Email: info@CNCmarket.ca
Phone: (825) 454 66 97
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 10.31.2026
Retail price as of 10.31.2026
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).
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 1.3: 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 coolant mixer, and top up with premixed coolant; the coolant calculator 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.
