Ceramic Mini Lessing Ring 10 vs 50 vs 80 vs 100 vs 120 vs 150 mm: How to Select the Right Size

Ceramic Mini Lessing Ring size changes the packed bed dramatically. Across DAIER's verified 10–150 mm series, specific surface area falls from approximately 420 to 60 m²/m³, the number of elements falls from about 750,000 to only 296 pieces/m³, and dry packing factor decreases from approximately 1,250 to 101 m⁻¹.

That creates a major engineering trade-off:

Smaller Ceramic Mini Lessing Ring → much greater surface-area density and a much finer packed bed

while:

Larger Ceramic Mini Lessing Ring → fewer elements, lower packing factor and a much coarser bed structure.

DAIER's catalog-confirmed series includes approximately:

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

The correct question is therefore not:

Which Ceramic Mini Lessing Ring size is best?

It is:

Which size provides enough gas-liquid contacting while remaining hydraulically practical for the tower diameter, gas load, liquid load and fouling conditions?

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1. Ceramic Mini Lessing Ring Size Data

DAIER's verified product database provides the following values:

An important limitation of the current verified table is that void fraction is not supplied for this product series.

Therefore, it would be incorrect to invent voidage values or copy them from another supplier.

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2. What Changes Most as Size Increases?

Three changes stand out immediately.

Surface area decreases

From:

420 m²/m³ at 10 mm

to:

60 m²/m³ at 150 mm.

Packing population decreases dramatically

From:

750,000 pieces/m³

to:

296 pieces/m³.

Packing factor decreases

From:

1,250 m⁻¹

to:

101 m⁻¹.

This means changing size does not simply change the dimensions of each ceramic element.

It changes the entire:

packed-bed architecture.

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3. Why Surface Area Matters

Specific surface area represents the amount of geometric packing surface contained in one cubic meter of packed bed.

Greater area can provide more potential locations for:

• liquid wetting;
• gas-liquid contact;
• interfacial mass transfer.

This is one reason smaller ceramic packing can be useful in contact-intensive service.

However:

Geometric surface area is not equal to effective mass-transfer area.

The effective area also depends on:

• liquid wetting;
• fluid properties;
• gas and liquid loads;
• distributor performance.

Therefore:

The 10 mm model should not automatically be selected simply because it provides 420 m²/m³.

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4. Why Packing Factor Matters

Dry packing factor provides another useful indication of how fine or geometrically restrictive a packed bed is.

The verified progression is:

• 10 mm — 1,250 m⁻¹;
• 50 mm — 565 m⁻¹;
• 80 mm — 356 m⁻¹;
• 100 mm — 252 m⁻¹;
• 120 mm — 146 m⁻¹;
• 150 mm — 101 m⁻¹. 

The direction is clear:

larger Ceramic Mini Lessing Ring → much lower packing factor.

This generally moves the product toward a more hydraulically open operating position.

But packing factor alone does not calculate:

• actual pressure drop;
• flooding velocity;
• tower capacity.

Those require real operating conditions.

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5. Why Packing Count Matters More Than It First Appears

The difference between sizes is enormous.

10 mm

Approximately:

750,000 elements/m³.

50 mm

Approximately:

6,500 elements/m³.

150 mm

Only approximately:

296 elements/m³.

This changes:

• the number of packing-to-packing contacts;
• characteristic void geometry;
• number of wetted elements;
• sensitivity to deposits;
• handling characteristics.

A 10 mm and a 150 mm Mini Lessing Ring bed should therefore never be treated as slightly different versions of the same hydraulic system.

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6. 10 mm Ceramic Mini Lessing Ring

The 10 mm model is the finest size in DAIER's verified series.

Its data include:

• 420 m²/m³ surface area;
• 800 kg/m³ bulk density;
• 750,000 pieces/m³;
• 1,250 m⁻¹ packing factor. 

This puts it firmly at the:

high-area / fine-bed

end of the family.

Where 10 mm May Be Attractive

It may deserve consideration where:

• high geometric contacting area is important;
• the process is clean;
• the tower is relatively small;
• hydraulic loading is limited.

Main Boundaries

The extremely fine bed also creates greater concern about:

• hydraulic resistance;
• fouling;
• crystallization;
• suspended solids.

10 mm should therefore be selected very deliberately.

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7. Why the 10 mm Model Is a Special Case

The 10 mm model is not just moderately smaller than the rest of the range.

Its surface area is almost:

three times the 145 m²/m³ of the 50 mm model.

Its packing population is more than:

100 times higher than the 50 mm model.

This is a fundamentally different packed-bed regime.

Therefore, replacing a larger Mini Lessing Ring with 10 mm elements should never be treated as a simple size substitution.

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8. 50 mm Ceramic Mini Lessing Ring

The 50 mm model provides:

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

Compared with the 10 mm model, it creates a much coarser bed.

Its surface-area density is lower, but the bed contains dramatically fewer ceramic elements.

This can make 50 mm more practical where:

• tower throughput becomes more important;
• some fouling tolerance is needed;
• the very fine 10 mm bed would be unnecessarily restrictive.

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9. 80 mm Ceramic Mini Lessing Ring

The 80 mm model has:

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

It moves further toward a coarse packed bed.

Compared with 50 mm:

• surface area decreases moderately;
• packing count falls from 6,500 to 1,950 pieces/m³;
• packing factor falls from 565 to 356 m⁻¹.

This can make 80 mm relevant where:

hydraulic openness becomes more important than maximizing geometric area.

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10. 100 mm Ceramic Mini Lessing Ring

The 100 mm model provides:

• 110 m²/m³ surface area;
• 850 kg/m³ bulk density;
• 1,000 pieces/m³;
• 252 m⁻¹ packing factor. 

This size occupies a large-element industrial position.

It may deserve evaluation when:

• the tower diameter is sufficiently large;
• gas throughput matters;
• the process does not require a very fine packing bed.

At this size, tower diameter becomes increasingly important because only about 1,000 pieces are present in one cubic meter.

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11. 120 mm Ceramic Mini Lessing Ring

The 120 mm model introduces another substantial step.

Its verified data include:

• 75 m²/m³ surface area;
• 860 kg/m³ bulk density;
• 370 pieces/m³;
• 146 m⁻¹ packing factor. 

Compared with 100 mm:

surface area falls from 110 to 75 m²/m³.

Packing population falls from:

1,000 to 370 pieces/m³.

This moves 120 mm much more strongly toward:

coarse, hydraulically open random packing.

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12. 150 mm Ceramic Mini Lessing Ring

The 150 mm model is the largest verified size.

It provides:

• 60 m²/m³ surface area;
• 980 kg/m³ bulk density;
• 296 pieces/m³;
• 101 m⁻¹ packing factor. 

It therefore represents the opposite end of the spectrum from the 10 mm model.

Its strengths are more likely to relate to:

• large characteristic passages;
• low element population;
• lower packing factor.

Its main trade-off is significantly reduced geometric surface-area density.

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13. Why “Mini” Does Not Mean Every Size Is Physically Small

The product family is called Ceramic Mini Lessing Ring, but the verified catalog contains sizes up to:

150 mm.

Therefore the word “Mini” should be understood as part of the product-family name.

It should not be interpreted as meaning:

every Mini Lessing Ring is a small packing element.

For procurement, nominal dimensions are more important than the commercial family name.

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14. Which Size Has the Highest Specific Surface Area?

The verified ranking is:

1. 10 mm — 420 m²/m³
2. 50 mm — 145 m²/m³
3. 80 mm — 120 m²/m³
4. 100 mm — 110 m²/m³
5. 120 mm — 75 m²/m³
6. 150 mm — 60 m²/m³. 

The relationship is clear:

surface-area density decreases strongly as nominal size increases.

But surface area should not be used as the only selection parameter.

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15. Which Size Has the Lowest Packing Factor?

The verified ranking in the opposite direction is:

• 150 mm — 101 m⁻¹;
• 120 mm — 146 m⁻¹;
• 100 mm — 252 m⁻¹;
• 80 mm — 356 m⁻¹;
• 50 mm — 565 m⁻¹;
• 10 mm — 1,250 m⁻¹. 

Therefore:

larger size generally moves the Mini Lessing Ring family toward lower geometric resistance.

Actual tower pressure drop still requires gas and liquid operating data.

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16. Bulk Density Does Not Follow a Simple Size Trend

This is one of the most important details in the verified data.

Bulk density changes as follows:

• 10 mm — 800 kg/m³;
• 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 50 mm model is actually much lighter per cubic meter than several larger sizes.

Therefore:

larger ceramic packing does not automatically mean lower packed-bed weight.

Differences in:

• wall thickness;
• geometry;
• ceramic volume per element

can change bulk density.

This matters for:

• support-grid design;
• tower structural loading;
• freight calculations.

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17. Why Ceramic Weight Matters

Ceramic random packing can create substantial dry bed weight.

For example, a packing with a bulk density approaching:

980 kg/m³

can create a significant structural load in a deep packed bed.

The packing support should therefore be checked for:

• packing dry weight;
• liquid holdup;
• deposits;
• operating loads.

This is especially important when replacing a lighter:

• plastic;
• metal

packing with ceramic material.

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18. Size Selection for Clean Contacting Service

For relatively clean service where mass-transfer contacting is the dominant consideration, the preliminary direction may move toward:

10–50 mm

when:

• higher geometric area is valuable;
• fouling risk is low;
• hydraulic margin is adequate.

80–100 mm

when:

• more hydraulic openness is needed;
• moderate contacting area remains sufficient.

120–150 mm

when:

• large passages and low packing factor become much stronger priorities.

This is a screening framework rather than a final design rule.

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19. Size Selection for High Gas Throughput

As gas throughput rises, the bed must preserve sufficient open flow space.

The decline in packing factor from:

1,250 m⁻¹ at 10 mm

to:

101 m⁻¹ at 150 mm

shows why larger sizes may move higher in the candidate list for hydraulically demanding service.

However:

selecting the largest size purely for gas capacity can sacrifice too much contacting area.

The tower still has to perform the required process duty.

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20. Size Selection for Fouling Service

Fouling changes the engineering priority.

Smaller packing produces:

• far more individual elements;
• finer characteristic passages;
• more packing-to-packing contacts.

Larger packing provides:

• fewer elements;
• coarser bed structure.

For example:

10 mm = 750,000 pieces/m³

versus:

150 mm = 296 pieces/m³.

As fouling becomes more important, larger sizes generally deserve stronger preliminary consideration.

But severe fouling may still require another packing geometry entirely.

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21. Crystallization Requires Particular Caution

Crystallizing service can cause deposits on:

• ceramic surfaces;
• element contact points;
• local flow passages.

A fine bed can progressively become restricted.

Therefore, high-surface-area small Ceramic Mini Lessing Ring should be approached cautiously where the stream contains substantial:

• crystallization;
• precipitation;
• suspended solids.

If plugging reliability dominates the project, a more open packing may be more appropriate.

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22. Tower Diameter Can Eliminate the 120 or 150 mm Options

A very large packing element requires a sufficiently large tower.

If 150 mm packing is installed in a relatively small tower:

• too few elements span the vessel diameter;
• wall effects become more significant;
• the random bed becomes less representative.

Therefore:

large Ceramic Mini Lessing Ring should not be selected before checking tower ID.

The low 101 m⁻¹ packing factor alone does not make 150 mm suitable for every high-flow tower.

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23. Small Tower Diameter Can Favor Smaller Packing

Smaller towers require enough packing elements across the cross-section to form a reasonable random bed.

This may move the preliminary selection toward smaller sizes.

However, extremely small 10 mm ceramic packing introduces its own:

• hydraulic;
• fouling

constraints.

Therefore the correct selection must balance:

Tower Diameter ↔ Packing Size ↔ Hydraulic Load

rather than applying one simple ratio blindly.

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24. Bed Height Cannot Automatically Remain the Same After a Size Change

Changing from:

50 mm → 120 mm

reduces the verified surface-area density from:

145 to 75 m²/m³.

Changing from:

100 mm → 10 mm

creates an even greater change.

Therefore, a retrofit that changes packing size may also change:

• mass-transfer behavior;
• required packed height;
• hydraulic characteristics.

Do not assume:

same tower + same bed height + different packing size = same process performance.

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25. Ceramic Mini Lessing Ring for Existing-Tower Replacement

For a like-for-like replacement, first identify:

• existing product type;
• nominal size;
• dimensions;
• bed height;
• tower ID;
• support-grid design.

If the existing packing has provided acceptable performance, retaining the same:

• geometry;
• size

may reduce retrofit uncertainty.

If the project intentionally changes size, it should be treated as an engineering modification.

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26. Support Grid Compatibility

The packing support must retain the selected ceramic element.

Changing from:

150 mm to 50 mm

or especially:

50 mm to 10 mm

can create a support-opening problem.

The existing support may allow smaller packing to:

• pass through;
• wedge incorrectly;
• load the grid improperly.

Therefore the support grid must be reviewed whenever packing size changes significantly.

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27. Ceramic Fragility Matters During Installation

Ceramic packing is mechanically different from plastic random packing.

Improper handling can cause:

• breakage;
• chips;
• fines.

Excessive breakage can alter the packed bed by creating:

• small fragments;
• local blockage;
• uneven void spaces.

Installation should therefore avoid uncontrolled dropping from excessive height.

Large and small ceramic packing sizes can have different handling risks, so packaging and installation procedure should be reviewed with the supplier.

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28. Chemical Resistance Still Requires Actual Ceramic Composition

“Ceramic” should not be treated as universally resistant to every chemical environment.

Compatibility can depend on:

• ceramic composition;
• acid exposure;
• alkali exposure;
• temperature;
• process concentration.

Therefore final procurement should confirm the actual material specification where the chemical environment is demanding.

Ceramic material selection and packing-size selection remain separate engineering questions.

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29. Quick Size Selection Direction

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30. Ceramic Mini Lessing Ring Size Decision Table

This table is a preliminary interpretation of DAIER's verified geometric product data and should not be treated as guaranteed tower performance.

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31. What Information Is Needed Before Selecting the Size?

A useful technical inquiry should provide:

• tower internal diameter;
• packed height;
• gas composition;
• liquid composition;
• gas flow;
• liquid flow;
• operating temperature;
• operating pressure;
• required process duty;
• allowable pressure drop;
• fouling or crystallization conditions.

For replacement projects also provide:

• existing packing size;
• existing packing type;
• support-grid opening;
• reason for replacement.

The correct size should solve the actual operating constraint rather than follow a generic “small is efficient” rule.

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Common Selection Mistakes

Selecting 10 mm Only Because It Has 420 m²/m³ Surface Area

It also has a very high 1,250 m⁻¹ packing factor and approximately 750,000 elements/m³.

Selecting 150 mm Only Because It Has the Lowest Packing Factor

Its geometric surface area is only about 60 m²/m³.

Assuming Larger Ceramic Packing Is Always Lighter

The verified 150 mm bulk density is approximately 980 kg/m³, compared with only 600 kg/m³ for the 50 mm product.

Inventing Void Fraction Values

The current DAIER verified Mini Lessing Ring dataset does not provide void fraction.

Ignoring Tower Diameter

120 and 150 mm elements require sufficient vessel diameter.

Ignoring the Support Grid

A grid designed for large packing may not retain smaller replacement elements.

Assuming Bed Height Can Stay Unchanged After a Size Change

Changing size can materially change mass-transfer and hydraulic behavior.

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Frequently Asked Questions

What Ceramic Mini Lessing Ring sizes are listed in DAIER's verified database?

Approximately 10, 50, 80, 100, 120 and 150 mm.

Which size has the highest specific surface area?

The 10 mm model at approximately 420 m²/m³.

Which size has the lowest packing factor?

The 150 mm model at approximately 101 m⁻¹.

How many 10 mm Ceramic Mini Lessing Rings are in one cubic meter?

Approximately 750,000 pieces/m³ according to DAIER's verified product dataset.

How many 150 mm elements are in one cubic meter?

Approximately 296 pieces/m³.

What is the surface area of 50 mm Ceramic Mini Lessing Ring?

Approximately 145 m²/m³.

What is the surface area of 100 mm Ceramic Mini Lessing Ring?

Approximately 110 m²/m³.

Is 10 mm always more efficient?

No. It provides much greater geometric area but also creates a much finer bed and substantially higher packing factor.

Is 150 mm always better for high-flow towers?

No. The tower must be large enough, and sufficient contacting area must still be maintained.

Which size is best for fouling service?

Larger sizes generally move toward a more open bed with far fewer packing elements, but severe fouling may require a different packing geometry entirely.

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Selection Takeaway

Ceramic Mini Lessing Ring size changes the entire packed-bed operating position.

Across DAIER's verified series:

10 mm → 420 m²/m³ surface area / 750,000 pcs/m³ / 1,250 m⁻¹ packing factor

while:

150 mm → 60 m²/m³ surface area / 296 pcs/m³ / 101 m⁻¹ packing factor.

This creates a clear preliminary direction:

Higher Contacting-Area Requirement → Smaller Size

while:

Greater Hydraulic Openness / Fouling Tolerance → Larger Size

But final selection must also account for:

• tower diameter;
• gas and liquid loads;
• required mass transfer;
• fouling;
• ceramic material compatibility;
• support-grid design;
• bed structural load.

The key principle is:

Do not select Ceramic Mini Lessing Ring size from surface area or packing factor alone. Select the size that gives the tower enough contacting capability without sacrificing the hydraulic and operational margin required by the real process.