Matcha particle size is a distribution, not one “average” number. D10, D50 and D90 describe different points in that distribution and can help buyers discuss mouthfeel, dispersion, powder handling and consistency—provided the measurement method and intended application are also known.
The Short Answer
D10, D50 and D90 are percentile diameters. For a volume-based result, D10 is the diameter below which 10% of the measured particle volume falls, D50 is the median and D90 describes the coarser end. The smallest number is not automatically the best commercial specification.
Use particle-size data to explain and control performance—not to replace application testing.
In This Guide
What Does “Particle Size” Mean in Matcha?
A matcha powder does not contain particles with one identical diameter. It contains a particle-size distribution: some particles are finer, some sit near the middle and some form a coarser tail. Two powders can look equally fine to the eye yet have different distributions, shapes and processing behavior.
Research has treated particle-size distribution as a significant physical characteristic of matcha, while studies comparing milling processes have found differences in particle size and surface morphology. That is why a useful technical conversation describes the distribution rather than relying on “fine” or “ultrafine.”
What Are D10, D50 and D90?
These values describe percentile points in a measured distribution. Their exact interpretation depends on the reporting basis. For a common volume-based laser-diffraction result:
- D10: 10% of the measured particle volume lies below this diameter.
- D50: 50% lies below this diameter. It is the median particle size.
- D90: 90% lies below this diameter, leaving 10% above it.
HORIBA’s technical guidance recommends using multiple distribution points because one number cannot describe distribution width. D10, D50 and D90 together are more informative than D50 alone.
A Simple D10 / D50 / D90 Example
Suppose a report states D10 = 5 μm, D50 = 14 μm and D90 = 32 μm. It does not mean every particle is 14 μm. On the stated measurement basis, 10% falls below 5 μm, half falls below 14 μm and 90% falls below 32 μm.
Now compare two samples with the same D50 of 14 μm but D90 values of 28 μm and 60 μm. Their medians match, but the second sample has a much coarser upper tail. That difference may matter for mouthfeel, settling or processing. The figures are illustrative, not universal matcha targets.
What Does μm Mean?
The symbol μm means micrometer, also called a micron. One micrometer is 0.001 millimeter. Matcha particles are small enough to appear smooth to the eye, but small differences across the distribution can still influence sensory and powder-handling behavior.
Why Does Particle Size Matter for Matcha?
| Property | Commercial relevance |
|---|---|
| Mouthfeel | The coarse end may be more noticeable in straight drinking |
| Suspension | Particle profile can influence settling and perceived uniformity |
| Flowability | Powder behavior affects filling, dosing and manufacturing |
| Mixing | Size, shape and agglomeration influence dispersion |
| Surface area | Finer particles expose more area to water and ingredients |
| Process consistency | A defined distribution can support repeatable handling |
A Food Chemistry study comparing cyclone-, bead- and stone-milled matcha found differences in particle size and surface morphology, with related differences in chemical release, stability and sensory properties. That supports measuring powder behavior, but it does not create a universal ranking of every mill or product.
Smaller Does Not Automatically Mean Better
A lower D50 describes a finer median on the stated measurement basis. It does not disclose leaf quality, harvest maturity, freshness, aroma, bitterness, umami, safety, certification or application fit. A finely milled weak raw material remains limited by that material.
Particle size is a technical specification, not a complete quality grade.
Milling method helps shape the distribution, but it should also be evaluated in context. See our guide to stone-milled vs ball-milled matcha.
Matcha Particle Size by Application
| Application | Particle-size priority | What to evaluate |
|---|---|---|
| Straight whisking | High | Mouthfeel, suspension, foam and D50/D90 context |
| Premium tea service | High | Smoothness plus complete sensory quality |
| Café latte | Medium–High | Dispersion, color, milk performance and service method |
| Flavored beverage | Medium | Finished performance and practical dose |
| Baking and desserts | Medium | Even distribution, finished color and flavor after heat |
| Food manufacturing | High | D50/D90, flow, mixing, filling and batch repeatability |
Straight Whisking
Straight matcha exposes suspension and mouthfeel with little masking. Fine, well-refined powder can be valuable, but aroma, bitterness, umami and finish still depend on the raw material and earlier processing. Evaluate smoothness, sediment, foam and flavor together. See matcha for straight whisking.
Lattes and Café Drinks
Milk, plant-based ingredients, syrup and ice change the drinking experience. A café should ask which profile gives the best finished latte at a practical dose—not which sample has the smallest D50. Test color, tea presence, dispersion, preparation speed and holding behavior in the actual recipe. See matcha for lattes and café drinks.
Baking and Desserts
Flour, sugar, fat, moisture and heat can reduce the importance of small fineness differences. Bakeries should prioritize even distribution, color after baking, flavor retention, dose and cost per finished item. See matcha for baking and desserts.
Food Manufacturing
Manufacturers may care about flowability, filling, conveying, blending, sedimentation and repeatability. The coarser tail can be particularly relevant, which is one reason D90 may be more useful than buyers expect.
Particle Size, Dispersion and Flow Are Related—but Not Identical
Matcha forms a suspension; it does not fully dissolve like sugar. Fine particles may support smoothness and dispersion, but agglomeration, moisture, shape, water temperature, formulation and mixing energy also matter. “Very fine” therefore does not prove instant or permanent dispersion.
Particle shape adds another variable. Particles may be irregular, flaky, rounded or fibrous, affecting packing, flow and interaction with liquids. Two powders with similar D50 values can behave differently.
A 2009 Japanese study comparing stone- and ball-milled matcha found method-specific differences in electrostatic charge and flowability. Its result is useful evidence that powder handling should be tested—not a universal rule for every machine, batch or humidity condition.
Milling Conditions Can Change the Distribution
Ball-milling speed, time, media size, loading and cooling can affect particle morphology and powder behavior. A 2024 Powder Technology study linked matcha particle morphology and flowability to collision conditions during ball milling.
Another study of stirred-media milling observed the median particle size fall from 330.3 μm at 20 minutes to 17.1 μm at 140 minutes in its specific experimental system. This demonstrates that milling time can shift a distribution; it should not be treated as a target for every product or process.
Why D90 Can Matter More Than Buyers Expect
D50 describes the middle of the distribution, while D90 helps reveal the coarse end. Two samples can share a D50 of 15 μm while reporting D90 values of 30 μm and 75 μm. The median is identical; the upper tails are not. That difference may contribute to different mouthfeel, settling or processing behavior.
What Is Span?
Span is a common way to describe distribution width:
Span = (D90 − D10) / D50
A smaller span generally represents a narrower distribution; a larger span represents a broader one. Many buyers do not need span as a separate purchasing requirement. D10, D50, D90 and application testing are often a more accessible starting point.
Do Not Compare Numbers Without the Measurement Method
Results depend on the technique, sample preparation, dispersion method, instrument settings and whether the result is based on volume, number, surface area or another basis. Laser diffraction commonly reports volume distributions, but other techniques may not.
Do not assume two D50 values are directly comparable unless the measurement method and reporting basis are known.
Mesh and particle-size distribution are also different. Mesh describes whether material passes through a sieve opening. D10, D50 and D90 describe points in a measured distribution and generally provide more detail for very fine powders.
What Should You Ask a Matcha Supplier?
- Is particle-size data available for this exact profile?
- What are the D10, D50 and D90 values?
- Which measurement technique and reporting basis were used?
- How was the sample prepared and dispersed?
- Which milling method and controls apply to this SKU?
- How does the powder perform in the intended application?
- Can batch consistency be reviewed over repeat orders?

Matcha Origin Co.’s Application-First Approach
Matcha Origin Co. treats particle size as one part of a sourcing decision: raw material + milling method + particle profile + sensory quality + application performance + commercial fit. The relevant weighting changes between straight tea, café service, baking and industrial manufacturing.
Compare available matcha profiles, then validate the selected profile under controlled preparation conditions.
Commercial Buyer Checklist
- Define the intended application and preparation process.
- Confirm the raw material, origin and milling method.
- Review D10, D50 and D90 where available.
- Record the measurement method and reporting basis.
- Test mouthfeel, dispersion, settling or flow as relevant.
- Compare dosage and cost in the finished product.
- Review documentation, MOQ, lead time and repeat-supply needs.
The smallest particle-size number is not automatically the best commercial matcha.
Frequently Asked Questions
What does D50 mean in matcha powder?
D50 is the median diameter of the measured distribution. For a volume-based result, 50% of the measured particle volume lies below that diameter and 50% lies above it. Always check the measurement method and reporting basis before comparing suppliers.
What does D90 mean?
D90 is the diameter below which 90% of the measured distribution lies on the stated basis. It helps describe the coarser end of the distribution and may reveal differences hidden by an identical D50.
Is lower D50 always better?
No. A lower D50 indicates a finer median under the stated test method. It does not prove better raw material, flavor, freshness, safety, consistency or application performance.
Does finer matcha dissolve better?
Matcha does not fully dissolve in water; it forms a suspension. Finer particles may support smoothness and dispersion, but particle shape, agglomeration, moisture, formulation and mixing method also affect the result.
Should cafés ask for D50?
D50 can be useful context, but a café should not select matcha from D50 alone. The decisive test is the complete latte recipe at a practical dose using the real service method.
Should food manufacturers request D90?
Often yes, particularly when a coarse tail may affect blending, flow, sedimentation, filling or visual uniformity. D90 should still be interpreted with the method, basis and application test.
Sources
- HORIBA: Setting Particle Size Specifications.
- HORIBA: Understanding and Interpreting Particle Size Distribution Calculations.
- A novel hyperspectral microscope imaging technology for rapid evaluation of particle size distribution in matcha, Journal of Food Engineering, 2020.
- Effect of three milling processes on the quality of matcha, Food Chemistry, 2022.
- Flowability Properties of Matcha Varying with Particle Size and Milling Method, 2009.
- Influence of ball milling on mechanical and physical properties of matcha powder, Powder Technology, 2024.
- Stirred media mill: A novel efficient technology for improving matcha, Powder Technology, 2023.
Understand the Specification. Then Test the Application.
Particle-size data becomes useful when it is connected to the product you are making. Compare profiles, review available technical information and test the finished application before committing to commercial volume.








































