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Table 20-3    The Properties that Lubricant Should Possess
No. Properties Description
1 Correct and
Proper Viscosity		 Lubricant should maintain a proper viscosity to form a stable oil film at the specified temperature and speed of operation.
2 Antiscoring Property Lubricant should have the property to prevent the scoring failure of tooth surface while under high-pressure of load.
3 Oxidization and Heat Stability A Good lubricant should nor oxidized easily and must perform in moist and high-temperature environment for long duration.
4 Water Antiaffinity Property Moisture tends to condense due to temperature change, when the gears are stopped. The lubricant should have the property of isolating moisture and water from lubricant.
5 Antifoam
Property		 If the lubricant foams under agitation, it will not provide a good oil film. Antifoam property is a vital requirement.
6 Anticorrosion Property Lubrication should be neutral and stable to prevent corrosion from rust that may mix into the oil.
Table 20-4    ISO Viscosity Grade of Industrial Lubricant (JIS K 2001)
ISO
Viscosity Grade		 Kinematic Viscosity Center Value 10-6m²/s (cSt) (40ºC) Kinematic Viscosity
Range
10-6m²/s (cSt)
(40ºC)
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG
ISO VG		 2
3
5
7
10
15
22
32
46
68
100
150
220
320
460
680
1000
1500

2.2
3.2
4.6
6.8
10
15
22
32
46
68
100
150
220
320
460
680
1000
1500
More Than
More Than
More Than
More Than
More Than
More Than
More Than
More Than
More Than
More Than
More Than
More Than
More Than
More Than
More Than
More Than
More Than
More Than

1.98
2.88
4.14
6.12
9.00
13.5
19.8
28.8
41.4
61.2
90.0
135
198
288
414
612
900
1350

 and less than
and less than
and less than
and less than
and less than
and less than
and less than
and less than
and less than
and less than
and less than
and less than
and less than
and less than
and less than
and less than
and less than
and less than

2.42
3.52
5.06
7.48
11.0
16.5
24.2
35.2
50.6
74.8
110
165
242
352
506
748
1100
1650

442