CALTEX HYDRAULIC FLUIDS

A hydraulic fluid or hydraulic liquid is the medium by which power is transferred in hydraulic machinery. Common hydraulic fluids are based on mineral oil or water. Examples of equipment that might use hydraulic fluids are excavators and backhoes, hydraulic brakes, power steering systems, transmissions, garbage trucks, aircraft flight control systems, lifts, and industrial machinery. The liquid must be non compressible and has fast air release. Additional properties include: Low foaming tendency and volatility. Good shear, thermal, oxidative and hydrolytic stability. Good filterability and demulsibility. Has antiwear and corrosion control.
Caltex Hydraulic Fluids are formulated with oil and ashless (zinc-free) additive that provides effective oxidation stability, water separability, foam suppression, and protection against wear, rust and corrosion. The anti-wear performance of these oils makes them especially suited for high‑performance industrial applications utilising axial piston pumps where pressures may exceed 5,000 psi (34 MPa). The zinc-free formula makes them well suited for applications involving yellow metals found in hydraulic systems. These are long-life lubricants (are not vegetable oil-based), with longer TOST (ASTM D943 oxidation stability test) lives than conventional zinc-based hydraulic  fluids, which equates to longer potential service life and are especially applicable in high efficiency (high-speed, high-temperature, high output) applications where severe stress is placed on the hydraulic fluid.

​There are three options for Hydraulic oil: AW, Rando HD and Rando HDZ. Please refer to the table below for differences:
CALTEX HYRDAULIC OIL ITEM COMPARISON
Item
Price
Technology
Temprerature
AW
Low
Standard
Standard
Rando HD
Normal
Additives for better performance
Standard
Rando HDZ
High
Additives for better performance
Wide Range
Different ISO Grades allow better performance for certain temperature ranges, please be guided by this chart:
CALTEX HYDRAULIC OIL COMPARISON CHART
ISO
Price
Air release
Flash point
Pour point
Viscosity
Viscosity
Viscosity
Grade
Liter
mins@50°C
°C
°C
mm2/s @40C
mm2/s @100C
Index
Rando 22
1.1
190
-36
21
4.3
110
Rando 32
191
1.1
216
-33
30.5
5.4
110
Rando 46
192
2
238
-33
44
6.8
110
Rando 68
193
3.6
240
-30
65
8.9
110
Rando 100
194
12
240
-21
95.5
10.8
97
Rando 150
16
250
-15
143
14.3
97
Rando 220
274
-12
220
19
97
Rando 320
277
-12
304
23.4
96
AW 22
200
-52
22.6
5.3
180
AW 32
222
-33
33.6
5.6
104
AW 46
224
-30
46
6.8
101
AW 68
160
224
-30
64.6
8.5
102
AW 100
266
-40
95
13.8
145
HDZ 15
150
-60
15.7
3.9
144
HDZ 22
164
-58
22.6
5.1
160
HDZ 32
204
-49
33
6.4
150
HDZ 46
201
216
-47
46.7
8.3
153
HDZ 68
202
222
-42
68.7
11.1
154
HDZ 100
236
-37
100.5
14.2
145
Caltex (main): Engine oil, Driveline Lubricants, Gear Lubricants, Hydraulic Lubricants, Industrial Lubricants