Why This Problem Keeps Confusing Buyers Like You

For many overseas buyers, the COA shows a perfect D50, yet the actual grinding, lapping, or polishing performance becomes unstable. You may experience:

• Lower removal rate
• More scratches
• Higher slurry viscosity
• Unstable Ra/Rz
• Faster tool wear

This creates a frustrating situation: “Data looks right, but production feels wrong.”

The root cause is simple: D50 alone cannot predict real performance, and relying on it leads to misleading purchasing decisions.

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Common Misunderstandings in the Market

1. Misunderstanding: D50 determines everything

Reality: D50 only tells you the median size. It does not control:

• Coarse tail (D90, D97)
• Fine tail (D10, submicron content)
• Oversize particles
• Agglomeration
• Particle shape
• Purity
• Batch consistency

2. Misunderstanding: Same D50 = same performance

Different suppliers may use:

• Different standards (FEPA F / JIS / internal)
• Different dispersion methods
• Different laser analyzers

So “D50 = 5 μm” from two suppliers can behave like two different grades.

3. Misunderstanding: If D50 is within range, the batch is stable

Even with identical D50, PSD shape may drift, causing:

• More scratches
• Lower removal rate
• Slurry instability

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Technical & Production Reasons Behind “D50 OK but Performance Fails”

1. PSD too wide: coarse tail & fine tail out of control

Item	Narrow PSD	Wide PSD
D50	5.0 μm	5.0 μm
D10	3.5 μm	1.0 μm
D90	7.0 μm	15.0 μm
Oversize	Very low	Noticeable
Behavior	Stable, predictable	Scratches, unstable removal

Impact:

• Coarse particles → deep scratches, tool wear
• Excess fines → agglomeration, viscosity rise, lower cutting efficiency

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2. Agglomeration creates a “fake D50”

If dispersion is insufficient, the analyzer measures agglomerates, not true particles.

Results:

• Lower cutting efficiency
• Lab results differ from real production
• Larger batch-to-batch variation

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3. Particle shape inconsistency

• Blocky → strong cutting
• Needle-like / flaky → sliding, haze, lower efficiency

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4. Contamination issues

Sources:

• Milling media
• Classifier wear
• Poor cleaning

Effects:

• Polishing chemistry instability
• Faster tool glazing
• Unstable sintering for ceramics/refractories

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5. Inconsistent test methods

• Dry vs wet
• Different ultrasonic time
• Different dispersants

This makes identical D50 powders behave completely differently.

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Pros & Cons of Different Approaches

Approach	Pros	Cons
D50-only purchasing	Simple	High risk, unstable
D10/D50/D90 + oversize	Stable performance	Requires capable supplier
SEM + chemical analysis	Clear morphology & purity	Slightly higher cost
Multi-batch evaluation	Checks consistency	Takes time
Sharing process data	Customizable powder	Requires technical communication

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How We Control and Solve These Issues

1. Precision milling & classification

• Controlled-energy ball mill / jet mill
• Tight control of D10–D90–D97

2. Agglomeration control

• Secondary de-agglomeration
• Surface treatment
• Strict wet-dispersion testing

3. Shape control

• Proper crushing method
• Avoid over-rounding or flake formation

4. Contamination control

• Ceramic-lined equipment
• Batch cleaning SOP
• Chemical analysis (SiC%, Fe2O3, Free Si, Free C)

5. Consistency control

• PSD curve records
• Trend analysis
• Fixed test protocol

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Who Is This Type of SiC Micro Powder Suitable For?

Suitable for:

• Glass/ceramic/metal grinding requiring stable Ra/Rz
• Polishing applications needing low scratches
• Semiconductor or precision parts sensitive to impurities
• Factories requiring long-term batch stability

Not suitable for:

• Buyers focused only on low price
• Applications with low performance requirements
• One-time purchases without consistency needs

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Want to Avoid “D50 OK but Performance Fails”?

If you are experiencing:

• More scratches
• Lower removal rate
• Batch instability
• Abnormal slurry viscosity
• Suppliers only saying “D50 is within spec”

We can help you with:

• Free PSD curve analysis
• Customized SiC micro powder specification
• Multi-batch consistency samples
• SEM & chemical reports
• Application-matching recommendations

Tell me your application, and I can generate a precise TDS tailored to your process.