What do D50 and D90 mean, respectively? Why is it essential to understand these two parameters when working with ultrafine materials?
Release time：2026-03-30
In ultra-fine cement, ultra-fine oil-well cement, and ultra-fine slag powder GGBS When consulting on materials such as high-performance accelerators, customers often encounter two parameters: D50 / D90
Many people know they are important, but they are not clear about what exactly they represent.
In fact, for ultrafine materials, D50 and D90 These are extremely fundamental yet critically important particle-size parameters. A clear understanding of these two metrics facilitates faster assessment of a material’s fineness, particle-size distribution, and grade differences.
1.D50 What does it mean?
D50 Generally understood as Median particle size . In other words, in a batch of particles, approximately 50% The particle size is less than this value.
Here’s a simple example:
If a certain product D50 Yes 5 micrometers , which can be understood as: approximately half of the particle sizes are smaller than 5 micrometers Therefore, D50 The smaller the value, the finer the overall particle size of the material.
2.D90 What does it mean?
D90 Means: approximately 90% The particle size is smaller than this value. It is more suitable for determining the upper limit of the material’s particle-size distribution.
If a product D90 A tendency toward larger particle sizes indicates that, although the median particle size may be satisfactory, a significant number of oversized particles still remain; if D90 It is also relatively small, indicating a more uniform and finer particle size distribution overall.
3. Why do we need to consider both parameters?
Many customers initially only look at D50 , feel “ It’s fine as long as this number is small. ” . But in reality, Only view D50 Not enough . Because D50 Reflects the intermediate level D90 Reflects the upper limit of distribution Only by combining these two parameters can the particle size distribution of an ultrafine material be assessed more comprehensively.
4. What is its purpose in model selection?
Taking ultra-fine cement as an example, between different grades D50 and D90 There will be a noticeable difference.
For example: Certain models D50 Smaller indicates a finer overall particle size.
Certain grades D90 It is also lower, indicating fewer coarse particles and a more uniform particle size distribution.
This will affect customers’ understanding of material fineness, penetration-related performance, and system compatibility.
5. How should customers view this?
The customer is looking. D50 and D90 At that time, it is recommended to make the judgment by considering the following aspects together: 1. Intended application of the material ; 2. Strength Development Requirements ; 3. Specific surface area ; 4. Packaging and Supply ;5. Sample Test Results
In other words, D50 and D90 It should not be considered in isolation but rather interpreted comprehensively in conjunction with other material parameters.
6. What can Kangjing provide?
Kang Jing specializes in ultra-fine cement, ultra-fine oilwell cement, and ultra-fine slag powder ( GGBS ) For products such as high-performance accelerators, corresponding parameter sheets are provided to facilitate material evaluation and model selection by customers.
For product specification sheets, model information, or sample support, please contact Kangjing.
Contact number: 18165358316 (Ms. Jin)
15002999716 (Mr. Sun)
Ultrafine cement,Ultra-fine slag powder,Ultra-fine oil well cement,Ultra-high-performance accelerator,Subsurface Geotechnical Treatment,Underground Geotechnical Leak Sealing
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