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What color is hydraulic oil?

2025-10-14 22:02:37 mechanical

What color is hydraulic oil?

Hydraulic oil is an indispensable working medium in hydraulic systems. Its color is not only an intuitive symbol to distinguish types, but is also closely related to performance and usage status. The following will analyze the color standards, common types and recent industry hot spots of hydraulic oil.

1. Color standards and meanings of hydraulic oil

What color is hydraulic oil?

Different types of hydraulic oil show different colors due to differences in additives and base oils. The following are common types and corresponding colors:

Hydraulic oil typetypical colorColor change alert
Mineral based hydraulic oilAmber or light yellowDarkening may cause oxidation or contamination
Synthetic Hydrocarbon Hydraulic Oil (PAO)Transparent or light yellowMilky white indicates water intrusion
Fire Resistant Hydraulic Fluid (HFC)green or blueTurbidity needs to be replaced immediately
Biodegradable hydraulic oillight green or colorlessBlackening indicates accelerated degradation

2. Recent hot spots in the hydraulic oil industry (last 10 days)

Combined with the hot search data on the entire network, the recent focus in the field of hydraulic oil is on environmental protection and technological upgrading:

hot topicsMain contentData source popularity
EU new environmental regulationsPlan to restrict the use of zinc-containing hydraulic oilBaidu Index rose 120%
Hydraulic oil AI monitoring technologyColor recognition rapid diagnosis systemWeChat reading volume: 100,000+
Construction machinery oil spill incidentA certain brand malfunctioned due to mixing of red hydraulic oilTop 50 topics on Weibo
Research and development of edible grade hydraulic oilTransparent hydraulic oil for food machineryZhihu hot post has more than 1,000 collections

3. Guide to handling abnormal color of hydraulic oil

Corresponding measures need to be taken when the color of the hydraulic oil changes as follows:

unusual colorPossible reasonsHandling suggestions
dark brown/blackHigh temperature oxidation or metal wearReplace and check filter element immediately
milkyMoisture mixed in (>500ppm)Dehydration or oil change
fluorescent greenMixed pollution of different oil productsThoroughly clean the system

4. Color guide for purchasing hydraulic oil

Things to note when choosing hydraulic oil:

1.Construction machinery: Amber anti-wear hydraulic oil (HM grade) is recommended to facilitate observation of contamination.

2.food processing: Colorless or white oil that meets FDA standards must be used

3.low temperature environment: Light-colored synthetic oil (such as transparent PAO) has better fluidity

4.high temperature system: Deep red fireproof hydraulic oil can withstand working conditions above 200℃

Summarize: The color of hydraulic oil is an important window for judging its quality. Users should regularly monitor the oil status through color changes. Recently, the industry has paid more attention to the development of environmentally friendly hydraulic oil. In the future, there may be more intelligent hydraulic oil products with color coding to distinguish functions.

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