best refrigaration oil for industrial compressors

What is oil viscosity

Oil Viscosity is the extent to which oil resists the tendency to flow and it is one of the most important physical properties of oil.

Changes in Viscosity
Even minor changes in viscosity, occuring at operating temperatures, can alter the function of the oil to the extent that  it can no longer provide sufficient lubrication. Changes in viscosity can result from a change in the base oil chemistry (a change in the oil’s molecular structure), or due to an ingressed contaminant.

Viscosity Index
The viscosity index (V.I.) of an oil is a number indicating the extent to which it is effected by changes in temperature. Oil that becomes very thin at high temperatures and extremely dense at low temperatures is known as having a low V.I. On the other hand, if an oil experiences only a minor change in viscosity over a wide temperature range, then it is known has having a high V.I.

Importance of Viscosity:
For proper compressor system operation, an oil with a sufficiently high V.I. for the expected temperature range is essential for insuring that the oil is able to perform its basic functions.

Viscosity grading:
The International Standardization Organization (ISO) has established a viscosity grading (VG) system for lubricants. The ISO VG is measured in centistokes at 40°C (104°F) and are labeled as ISO VG 32, ISO VG 68, ISO VG 100, etc. The common viscosity range of compressor lubricants is 32 cSt to 220 cSt.

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