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What is the relationship between the color and quality of air compressor oil

The setting of the oil sight glass of the air compressor is to facilitate the understanding of the remaining amount and color of the lubricating oil. Then can we judge whether the equipment is faulty from the color of the lubricating oil? If it is the same lubricating oil, according to the trend of the time scale, it is possible to analyze and judge the change of the quality of the lubricating oil. Because, the change of color means that its chemical composition has changed or there are pollutants. If it is not the same type of oil, the quality of the oil cannot be judged based on the color alone. The color of lubricating oil is related to its main raw materials, and its color has no direct corresponding relationship with the quality of oil.


base oil

 

The base oil varies in color depending on the depth of processing. Type I oils are mostly pale yellow, but the base oils of Type II and III refined by advanced hydrotreating, and synthetic oils prepared by chemical methods, such as PAO, ester oils, polyethers, etc., will contain less aromatic hydrocarbons When there are other impurities, their color will be relatively lighter, and they can be as translucent as water!


additive

 

Influence of additives, air compressor oil includes: viscosity index improver, extreme pressure antiwear agent, antioxidant, antifoaming agent, rust inhibitor, antiemulsifier and so on. All of these additives have their own different colors.


When the additive and base oil are blended, the color of the lubricating oil will vary, either darker (such as brown), or lighter.


dye

 

Influence of dyeing agent, sometimes a specific dyeing agent is added to some lubricating oils and greases to change their original color. The purpose of this is sometimes to serve as a warning to distinguish other lubricants. In fact, it is more of a marketing factor. For example, Ingersoll Rand is light red, Sullair is green, Atlas is translucent white, CompAir It is blue, Unitex is red, etc. Sometimes it is just to distinguish different product lines, and the dye will not play any role in lubricating and protecting.


During the use of air compressor oil, the color of the oil will change from light to dark, which is a common phenomenon. Some users directly confuse the darkening of the oil with the quality of the oil and change the oil immediately, which is unscientific. When the air compressor oil needs to be replaced, in addition to judging from the appearance, it also needs to be judged from the change of the comprehensive indicators such as viscosity, acid value, insoluble content, etc., or roughly according to the experience of the field service personnel, from the consistency, smell, appearance. , Preliminary judgment, sometimes the appearance of oil products looks good, but it has been seriously gelled and aged. If only judged from appearance, it is easy to waste resources or ignore the real risks that actually occur.


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