- Circulating systems & bearings
ISO VG 320
Circulating oil for rolling mill bearings under heavy water contamination, ISO VG 320
ViscosityISO VG
Business customers only. We sell wholesale, invoiced to registered companies.
Industrial gear oil CL — DIN 51517, part 2
CL oils, additised against oxidation and corrosion but without extreme-pressure additives.
| Property | Typical value | Method |
|---|---|---|
| Copper strip corrosion, 3 h, 100 CRating | 1B | ASTM D130 |
| Demulsibility, Free Water, 52 C (125 F), Non-EP Oilsml | 39 | ASTM D2711(mod) |
| Density @ 15 Ckg/l | 0.9 | ASTM D4052 |
| Emulsion, Time to 40/37/3, 82 Cmin | 25 | ASTM D1401 |
| Flash point, Cleveland Open Cup°C | 286 | ASTM D92 |
| Foam, Sequence I, Stabilityml | 0 | ASTM D892 |
| Foam, Sequence I, Tendencyml | 0 | ASTM D892 |
| Kinematic viscosity @ 100 Cmm2/s | 23.9 | ASTM D445 |
| Kinematic viscosity @ 40 Cmm2/s | 320 | ASTM D445 |
| Pour point°C | -9 | ASTM D97 |
| Rust Characteristics, Procedure A | PASS | ASTM D665 |
| Viscosity index | 95 | ASTM D2270 |

Mobil Vacuoline 137 is the ISO VG 320 grade of the Mobil Vacuoline 100 Series, a range of extra high quality circulating system oils primarily intended for the lubrication of plain bearings in full fluid lubrication systems, particularly those subjected to heavy water contamination, such as back-up roll bearings in metal rolling mills. Its kinematic viscosity is 320 mm²/s at 40 °C and 23.9 mm²/s at 100 °C, with a viscosity index of 95. Formulated from high-quality base stocks and additives, the series delivers outstanding water separation ability, good resistance to thermal degradation and oxidation, and protection against rust and corrosion, while remaining highly resistant to emulsion and sludge formation for cleaner systems and filters. The oil has a high viscosity index and good demulsibility that is retained even under severe water contamination, making it suitable for both single- and dual-tank circulation systems. Mobil Vacuoline 137 has a pour point of -9 °C and a flash point of 286 °C (Cleveland open cup). It is used almost exclusively for rolling mill applications, particularly back-up roll bearing systems, and other full-fluid bearing systems subject to heavy water ingress in related industries. Solid contaminants separate readily, allowing easy cleaning by centrifuge, filtration or settling, which extends oil charge life and reduces maintenance costs. Mobil Vacuoline 137 meets DIN 51517-2:2018-09 and satisfies the Primetals Technologies Morgoil Advanced (Rev 2.5a) and Standard (Rev 1.1) Lubricant Specifications as well as the SMS Group X-Roll Oil Bearing Advanced (SN 180-4) and Standard (SN 180-3) Lubricant Specifications, reflecting strong support from key rolling mill equipment builders.
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