hydraulic Oil- HH Grade is a hydraulic oil based on mineral base oil and additives for hydraulic and power-transmission systems built to the relevant standards. Grades: HH 22, HH 32, HH 46, HH 68, HH 150. In the ISO 6743-4 family, HH denotes a refined base oil without rust, oxidation or anti-wear additives (ASTM D6158).
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Grades & published data
Typical values from the product data sheet, each with its test method.
| Property | HH 22 | HH 32 | HH 46 | HH 68 | HH 150 | Method |
|---|---|---|---|---|---|---|
| Kinematic viscosity at 40 °CcSt | 22 | 32 | 46 | 68 | 150 | ASTM D-445 |
| Kinematic viscosity at 100 °CcSt | 4 | 5.5 | 6.5 | 8.5 | 14.5 | ASTM D-445 |
| Viscosity index | 100 | 100 | 95 | 95 | 95 | ASTM D-2270 |
| Pour point°C | -30 | -30 | -27 | -24 | -18 | ASTM D-97 |
| Flash point (open cup)°C | 200 | 210 | 220 | 220 | 225 | ASTM D-92 |
| Density at 15 °C | 868 | 868 | 880 | 884 | 884 | ASTM D-4052 |
Overview
hydraulic Oil- HH Grade is a hydraulic oil based on mineral base oil and additives for hydraulic and power-transmission systems built to the relevant standards. Grades: HH 22, HH 32, HH 46, HH 68, HH 150. In the ISO 6743-4 family, HH denotes a refined base oil without rust, oxidation or anti-wear additives (ASTM D6158).
The specification table lists each grade separately, with the test method for every value, so grades can be compared directly before ordering.
Application
Systems whose manufacturer specifies an ISO 6743-4 HH fluid; where HL, HM or HV is specified, choose that category instead.
Feature
HH 22: KV40 22 cSt, KV100 4 cSt, VI 100, pour point -30 °C, flash point 200 °C; HH 32: KV40 32 cSt, KV100 5.5 cSt, VI 100, pour point -30 °C, flash point 210 °C; HH 46: KV40 46 cSt, KV100 6.5 cSt, VI 95, pour point -27 °C, flash point 220 °C; HH 68: KV40 68 cSt, KV100 8.5 cSt, VI 95, pour point -24 °C, flash point 220 °C; HH 150: KV40 150 cSt, KV100 14.5 cSt, VI 95, pour point -18 °C, flash point 225 °C.
Under ISO 6743-4 (as summarised in ASTM D6158), HH is a refined base oil without rust, oxidation or anti-wear additives, while HL adds rust and oxidation inhibitors. Use the category your equipment manufacturer specifies.
Next step
The range above is what we publish. Formulation to a customer brief is a route of its own, and a sample is the first stage of it.
