In the global diesel trade, accurately understanding the low-temperature flowability of oil products is of vital importance. Among them, "Pour Point" and "Cold filter point" (CFPP) are the two most frequently mentioned key parameters, but they have completely different meanings and application values when evaluating the low-temperature performance of diesel.
Pour point is the lowest temperature at which a liquid can still flow, while cold filter plugging point (CFPP) is the temperature at which fuel begins to form wax crystals and may clog the fuel filter, affecting the engine's performance in cold conditions. Essentially, pour point indicates the fluidity of the fuel, while cold filter plugging point indicates its ability to pass through the filter.
The following is a more detailed classification:
The temperature at which a liquid loses its ability to flow or pour.
The measurement is made by observing the moment when the liquid stops moving when the test container is tilted.
Ensure that the fuel and lubricating oil can be pumped and processed in cold environments.
The lowest temperature at which fuel can still flow after passing through the standard filter.
One of the key parameters of diesel is that wax crystals may form and clog the fuel filter at low temperatures, causing engine problems.
CFPP is a more practical indicator of low-temperature operability than pour point, as it is directly related to filter cake blockage.
|
Speciality |
Pour Point |
CFPP |
|
Definition |
The lowest temperature at which the diesel sample stops flowing under standard conditions |
The lowest temperature at which diesel cannot pass through a standard filter under specific vacuum conditions |
|
Test Method |
Tilt the test tube and observe whether the sample is flowing. |
Simulated engine fuel supply system. Measurement of filter blockage temperature |
|
Practical Relevance |
The critical point at which the overall fluidity of the sample is lost |
The actual risk temperature at which wax crystallization occurs and leads to filter blockage |
Practical Value: Why is the CFPP more favored by the international market?
Although the pour point can reflect the basic low-temperature performance of the oil, its limitations are becoming increasingly prominent in international trade:
It is divorced from actual scenarios: It merely indicates complete non-flowability, but in reality, diesel may already cause wax crystallization to block the filter screen before reaching the pour point, resulting in a fuel supply interruption and the engine being unable to operate even though it is not "frozen".
Industry standards have weakened: Major import markets such as Europe, Japan, etc. more commonly adopt indicators such as CFPP and LTFT (Low Temperature Flow Test) that directly reflect vehicle performance. For instance, the EU EN 590 diesel standard explicitly includes CFPP as a core winter indicator.
The cold filter plugging point (CFPP) has been recognized as the "gold standard" worldwide due to its high degree of simulation of real working conditions:
Directly issue an oil supply risk warning: Precisely indicates the temperature at which the wax crystals in the diesel have grown to a sufficient extent to block the engine fuel filter, and is directly related to the actual start-up and operation difficulties of the vehicle.
Regional Adaptation Compass: Different climate zones around the world have clear and distinct seasonal requirements for diesel CFPP (for example, in northern Europe, the requirement is that CFPP should be ≤ -20°C or even lower, while in tropical regions, the requirements are much more lenient). Mastering CFPP means being able to precisely match the technical regulations and end-user demands of the target market.
Key terms of the trade contract: CFPP is the most commonly specified winter performance guarantee value in international diesel purchase contracts, and it directly affects product pricing and market access.
Final takeaway
1. Prioritize CFPP testing: It is recommended that CFPP tests be conducted for every batch of exported diesel.
2. Dynamic formula adjustment: Adjust the usage of additives according to the seasonal changes in the target market.
3. Establish technical files: Collect the latest diesel standards and CFPP requirements from major importing countries!
If you need the latest list of CFPP requirements for global diesel standards, please feel free to contact our technical advisory team.
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