Ceramic Mini Lessing Ring vs Ceramic Raschig Ring: Which Random Packing Should You Select?

Ceramic Mini Lessing Ring and Ceramic Raschig Ring are both ceramic ring-type random packings, but their internal geometry creates very different packed-bed characteristics. At comparable 50, 80 and 100 mm sizes in DAIER's catalog-confirmed data, Mini Lessing Ring provides substantially greater specific surface area, while also carrying a higher dry packing factor at every directly comparable size.

The decision is therefore not simply:

Which ceramic ring is more advanced?

The real question is:

Does the process need the additional geometric contacting area created by the Mini Lessing Ring geometry, or is the simpler and lower-packing-factor Raschig Ring more appropriate?

Neither is universally superior.

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1. Direct Answer

Choose Ceramic Raschig Ring more readily when:

• simple cylindrical geometry is preferred;
• the existing tower already uses Raschig Rings;
• like-for-like replacement is important;
• lower catalog packing factor is valuable;
• the additional geometric area of Mini Lessing Ring is unnecessary;
• minimizing retrofit uncertainty matters.

Evaluate Ceramic Mini Lessing Ring more strongly when:

• greater geometric surface-area density is important;
• ceramic construction is already required;
• the service is sufficiently clean for a more internally structured packing;
• additional bed weight is acceptable;
• the process can justify the higher packing-factor position.

The core trade-off is:

Mini Lessing Ring → More Geometric Surface Area

versus:

Raschig Ring → Simpler Geometry + Lower Catalog Packing Factor

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2. Why These Two Products Are Not Equivalent

Ceramic Raschig Ring uses a simple hollow cylindrical structure.

Its main geometric parameters are:

• diameter;
• height;
• wall thickness.

Ceramic Mini Lessing Ring adds internal geometry that increases the amount of ceramic surface exposed inside the element.

DAIER's catalog lists Mini Lessing Ring models including:

• 10 mm;
• 50 mm;
• 80 mm;
• 100 mm;
• 120 mm;
• 150 mm. 

This additional internal structure changes much more than the appearance of the individual piece.

It changes:

• geometric surface area;
• ceramic mass per bed volume;
• packing factor;
• flow-path complexity.

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3. The Best Direct Comparisons

DAIER's verified datasets provide exact nominal-size comparisons at:

• 50 mm;
• 80 mm;
• 100 mm.

Mini Lessing Ring catalog records do not contain verified void-fraction values in the current DAIER dataset, so this article does not invent them. 

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4. 50 mm: Same Bed Weight, Very Different Geometry

At 50 mm:

Ceramic Mini Lessing Ring

• 145 m²/m³ surface area;
• 600 kg/m³ bulk density;
• 6,500 pcs/m³;
• 565 m⁻¹ packing factor.

Ceramic Raschig Ring

• 92 m²/m³ surface area;
• 600 kg/m³ bulk density;
• 5,792 pcs/m³;
• 213 m⁻¹ packing factor. 

The dry packed-bed weight is identical:

600 kg/m³.

But Mini Lessing Ring provides approximately:

58% more geometric surface area.

That additional area comes with a much higher catalog packing factor.

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5. Why the 50 mm Example Matters

Because it isolates the geometry effect.

The two packings have the same published:

bulk density.

So the difference is not simply that one bed contains more ceramic mass.

Instead, the Mini Lessing geometry distributes that ceramic differently and creates:

• more exposed area;
• more complex flow paths.

This is an excellent example of why:

bulk density alone cannot describe a random packing.

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6. Packing Factor Changes Much More Than Surface Area

At 50 mm:

Surface Area

92 → 145 m²/m³.

Packing Factor

213 → 565 m⁻¹. 

So Mini Lessing Ring gains substantial geometric area, but the published packing factor increases even more strongly.

This means the correct decision is not:

more surface area = automatically better.

The tower must actually need that extra contacting area enough to justify the finer geometric hydraulic position.

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7. Does Higher Packing Factor Mean 2.65× the Pressure Drop?

No.

That would be an incorrect interpretation.

Actual tower pressure drop depends on:

• gas velocity;
• liquid rate;
• gas density;
• liquid properties;
• bed height.

Dry packing factor is an engineering descriptor used in hydraulic relationships.

It is not the actual operating ΔP.

Therefore no percentage pressure-drop claim should be derived directly from the 565 vs 213 m⁻¹ values.

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8. 80 mm Is an Even More Interesting Comparison

At 80 mm:

Mini Lessing Ring

• 120 m²/m³ surface area;
• 820 kg/m³;
• 1,950 pcs/m³;
• 356 m⁻¹ packing factor.

Raschig Ring

• 46 m²/m³ surface area;
• 660 kg/m³;
• 1,953 pcs/m³;
• 280 m⁻¹ packing factor. 

The packing population is almost identical:

1,950 vs 1,953 pieces/m³.

Yet the surface-area difference is enormous.

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9. Same Number of Pieces Does Not Mean the Same Bed

At approximately 1,950 elements per cubic meter:

Mini Lessing Ring

provides:

120 m²/m³

while Raschig Ring provides:

46 m²/m³.

That means Mini Lessing Ring provides more than:

2.6× the geometric surface area

with almost exactly the same number of individual packing elements. 

This is one of the most important lessons from the comparison:

Packing population cannot be used as a proxy for contacting area.

Individual element geometry matters far more.

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10. But the 80 mm Mini Lessing Bed Is Much Heavier

The same comparison also reveals a major mechanical trade-off.

Mini Lessing Ring

820 kg/m³.

Raschig Ring

660 kg/m³. 

That is approximately:

160 kg/m³ additional dry packing weight.

For a 10 m³ bed, the dry packing-weight difference alone would be approximately:

1,600 kg.

That can materially affect:

• packing support design;
• support beams;
• installation logistics.

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11. 100 mm Gives an Even Cleaner Geometry Comparison

At 100 mm, both products have exactly:

1,000 pieces/m³.

Yet:

Mini Lessing Ring

• 110 m²/m³;
• 850 kg/m³;
• 252 m⁻¹ packing factor.

Raschig Ring

• 70 m²/m³;
• 600 kg/m³;
• 172 m⁻¹ packing factor. 

This may be the cleanest evidence in the whole comparison.

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12. What Does the 100 mm Example Prove?

Both beds contain:

1,000 individual pieces per cubic meter.

But Mini Lessing Ring provides:

40 m²/m³ more geometric surface area.

That is approximately:

57% more area.

At the same time, its dry bed is approximately:

250 kg/m³ heavier

and its packing factor is:

252 vs 172 m⁻¹. 

So the difference comes directly from:

how each individual ceramic element is constructed.

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13. The Comparison Across All Three Sizes

This is a supplier-specific comparison based on DAIER's verified product dataset. 

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14. Why Void Fraction Is Not Included in the Comparison

DAIER's Ceramic Raschig Ring data include verified void fractions.

For example:

• 50 mm — 74%;
• 80 mm — 80%;
• 100 mm — 70%. 

But the current catalog-aligned Mini Lessing Ring records contain:

voidFraction = null.

Therefore the correct engineering approach is:

leave the Mini Lessing Ring void fraction unclaimed until verified.

Do not estimate it from:

• Raschig Ring;
• another supplier;
• another ceramic ring geometry.

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15. Which Has More Contacting Area?

Within the exact matched catalog sizes:

Mini Lessing Ring.

The differences are:

50 mm

145 vs 92 m²/m³.

80 mm

120 vs 46 m²/m³.

100 mm

110 vs 70 m²/m³. 

This makes Mini Lessing Ring a legitimate candidate where high geometric area is specifically valuable.

However:

geometric surface area is not automatically effective mass-transfer area.

Actual wetting still matters.

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16. Which Has the Lower Packing-Factor Position?

At every matched size:

Ceramic Raschig Ring.

50 mm

213 vs 565 m⁻¹.

80 mm

280 vs 356 m⁻¹.

100 mm

172 vs 252 m⁻¹. 

This gives Raschig Ring the stronger preliminary position where:

• simpler hydraulic geometry;
• lower packing factor

are important.

But again, actual tower pressure drop needs operating conditions.

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17. Why the Relative Difference Changes with Size

The packing-factor gap is not constant.

50 mm

Mini Lessing is dramatically higher.

80 mm

The difference becomes much smaller.

100 mm

A moderate gap remains.

Therefore:

the family comparison itself is size-dependent.

You cannot use the 50 mm relationship to predict the 80 or 100 mm relationship.

Exact model data matter.

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18. Which Is Better for a Clean Contact-Intensive Process?

Mini Lessing Ring may deserve stronger screening where:

• service is clean;
• geometric contacting area is particularly important;
• additional bed weight is acceptable;
• higher packing-factor geometry remains hydraulically manageable.

The strongest evidence comes from 80 mm:

120 vs 46 m²/m³

at almost exactly the same packing population.

That is a real contact-area advantage.

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19. Which Is Better When Hydraulic Margin Is Tight?

Ceramic Raschig Ring generally deserves stronger preliminary consideration based on the verified dry packing factors.

It also provides:

• simpler internal geometry.

This can make it attractive where the tower prioritizes:

• less complex flow passages;
• hydraulic operating margin.

However, actual pressure drop and capacity should still be confirmed using:

• gas flow;
• liquid flow;
• tower diameter;
• bed height.

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20. Which Is Better for Fouling?

This is another area where simpler geometry matters.

Ceramic Raschig Ring has:

• a plain cylindrical passage.

Mini Lessing Ring contains additional internal ceramic structure.

Where there are:

• crystals;
• suspended solids;
• sticky deposits;

a simpler geometry may deserve stronger consideration.

However, fouling resistance also depends strongly on:

• size;
• deposit mechanism;
• operating conditions.

Neither packing should be described as fouling-proof.

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21. Large Mini Lessing Ring May Still Be Used for Coarser Beds

The Mini Lessing series extends to:

• 120 mm;
• 150 mm.

The verified data show:

120 mm

• 75 m²/m³;
• 860 kg/m³;
• 370 pcs/m³;
• 146 m⁻¹ packing factor.

150 mm

• 60 m²/m³;
• 980 kg/m³;
• 296 pcs/m³;
• 101 m⁻¹ packing factor. 

So the family itself spans from:

• very fine;
• very high-area packing

to:

• very large, coarse elements.

Product family alone is not enough; size remains critical.

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22. A Surprising Bed-Weight Trend in Mini Lessing Ring

Mini Lessing Ring bulk density does not simply decrease as size increases.

Verified values include:

• 50 mm — 600 kg/m³;
• 80 mm — 820 kg/m³;
• 100 mm — 850 kg/m³;
• 120 mm — 860 kg/m³;
• 150 mm — 980 kg/m³. 

The bed actually becomes heavier again at the large-size end.

This reflects increasing:

• element dimensions;
• wall/internal ceramic structure.

Therefore:

larger ceramic random packing does not necessarily mean a lighter packed bed.

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23. Existing Raschig Ring Tower: Should You Change to Mini Lessing Ring?

Only if there is a defined engineering reason.

Suppose an existing tower contains:

100 mm Ceramic Raschig Ring.

Changing to 100 mm Mini Lessing Ring would change:

• surface area: 70 → 110 m²/m³;
• bulk density: 600 → 850 kg/m³;
• packing factor: 172 → 252 m⁻¹;

while packing population remains:

1,000 pcs/m³. 

That is clearly not a like-for-like replacement.

It is an engineering retrofit.

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24. Existing Mini Lessing Tower: Should You Change to Raschig Ring?

A change may be considered when:

• pressure-drop margin is problematic;
• heavy bed loading matters;
• simple geometry is preferred;
• fouling has become a concern.

But switching to Raschig Ring also reduces:

• geometric surface-area density.

Therefore the required process duty must be checked before replacement.

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25. Do Not Automatically Keep the Same Packed Height

Because the two geometries provide different surface-area densities and different packing factors:

same nominal size + same bed height does not guarantee equivalent tower performance.

For example at 80 mm:

• Mini Lessing — 120 m²/m³;
• Raschig — 46 m²/m³. 

That is too large a geometry change to ignore.

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26. Support Grid Load Can Become Critical

Ceramic random packing already creates substantial dead load.

Mini Lessing Ring can become especially heavy.

For example:

100 mm

• Mini Lessing — 850 kg/m³;
• Raschig — 600 kg/m³.

For a large bed, this difference should be reflected in:

• packing support;
• support beams;
• tower internals.

Also include:

• liquid holdup;
• deposits;
• operating load

in the final mechanical review.

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27. Ceramic Quality Is a Separate Decision

Choosing Mini Lessing or Raschig geometry does not determine whether the ceramic itself is acceptable.

Confirm:

• chemical composition;
• acid resistance;
• alkali resistance where relevant;
• mechanical strength;
• temperature capability.

Geometry selection and ceramic-material qualification are separate decisions.

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28. Quick Selection Guide

Favor Ceramic Raschig Ring when:

• simple geometry is important;
• existing Raschig Ring service is proven;
• like-for-like replacement is desired;
• lower catalog packing factor is useful;
• bed weight should be minimized relative to large Mini Lessing models.

Evaluate Ceramic Mini Lessing Ring when:

• substantially greater geometric area is required;
• ceramic remains the correct material;
• the service is sufficiently clean;
• additional bed weight and finer geometry are acceptable.

Consider another ceramic packing when:

• hydraulic capacity and contacting both require a different balance;
• Intalox Saddle, Pall Ring or Cascade Mini Ring provides a better verified position.

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Common Selection Mistakes

Comparing Only Pieces per Cubic Meter

At 100 mm both have 1,000 pcs/m³ but very different surface area and packing factor.

Assuming Same Size Means Same Bed

50, 80 and 100 mm comparisons show large geometry differences.

Selecting Mini Lessing Only Because It Has More Surface Area

It also has higher dry packing factor.

Selecting Raschig Only Because It Is Simpler

The process may genuinely benefit from the extra geometric area of Mini Lessing.

Assuming Larger Mini Lessing Ring Is Lighter

The verified bed density actually rises strongly at large sizes.

Inventing Mini Lessing Void Fraction

The current DAIER verified dataset does not provide it.

Converting Packing Factor Directly into Actual Pressure Drop

Tower operating conditions are required.

Changing Packing Family Without Reviewing Support Load

Large Mini Lessing beds can be substantially heavier.

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Frequently Asked Questions

What is the main difference between Ceramic Mini Lessing Ring and Raschig Ring?

Mini Lessing Ring contains more internal ceramic geometry, creating substantially greater geometric surface area but also a higher dry packing-factor position in the DAIER matched-size data.

What is the 50 mm comparison?

Mini Lessing Ring:

• 145 m²/m³;
• 600 kg/m³;
• 6,500 pcs/m³;
• 565 m⁻¹.

Raschig Ring:

• 92 m²/m³;
• 600 kg/m³;
• 5,792 pcs/m³;
• 213 m⁻¹. 

What is the 80 mm comparison?

Mini Lessing:

• 120 m²/m³;
• 820 kg/m³;
• 1,950 pcs/m³;
• 356 m⁻¹.

Raschig:

• 46 m²/m³;
• 660 kg/m³;
• 1,953 pcs/m³;
• 280 m⁻¹.

Why is the 80 mm comparison important?

Because packing population is almost identical, but Mini Lessing provides more than 2.6 times the geometric surface area.

What is the 100 mm comparison?

Mini Lessing:

• 110 m²/m³;
• 850 kg/m³;
• 1,000 pcs/m³;
• 252 m⁻¹.

Raschig:

• 70 m²/m³;
• 600 kg/m³;
• 1,000 pcs/m³;
• 172 m⁻¹.

Which has more surface area?

Mini Lessing Ring at all three directly matched sizes.

Which has lower packing factor?

Ceramic Raschig Ring at all three directly matched sizes.

Which is lighter?

At 50 mm they have the same verified bulk density. At 80 and 100 mm Raschig Ring is lighter.

Which has higher void fraction?

The current verified Mini Lessing Ring data do not provide void fraction, so a reliable direct comparison cannot be made.

Can Mini Lessing Ring directly replace Raschig Ring?

No. Treat the change as an engineering retrofit because surface area, packing factor and potentially support load change substantially.

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Selection Takeaway

Ceramic Mini Lessing Ring vs Ceramic Raschig Ring is fundamentally a geometry-utilization trade-off.

At 50 mm:

Mini Lessing → 145 m²/m³ / 600 kg/m³ / 565 m⁻¹

versus:

Raschig → 92 m²/m³ / 600 kg/m³ / 213 m⁻¹.

At 80 mm, both contain almost exactly 1,950 pieces/m³, yet:

Mini Lessing → 120 m²/m³

versus:

Raschig → 46 m²/m³.

At 100 mm, both contain exactly 1,000 pieces/m³, yet:

Mini Lessing → 110 m²/m³ / 850 kg/m³ / 252 m⁻¹

versus:

Raschig → 70 m²/m³ / 600 kg/m³ / 172 m⁻¹. 

This proves a valuable engineering point:

The number of packing pieces does not determine the amount of contacting surface. Internal element geometry can radically change the packed bed even when nominal size and pieces per cubic meter are identical.

The preliminary selection is therefore:

Higher Geometric Contact Area → Ceramic Mini Lessing Ring

while:

Simpler Geometry / Lower Packing-Factor Position / Lower Large-Size Bed Weight → Ceramic Raschig Ring

The correct selection sequence is:

Process Duty → Required Contacting Area → Hydraulic Constraint → Fouling → Tower Diameter → Exact Packing Geometry → Packed-Bed Weight → Ceramic Quality → Internals Review