What Is Plastic Lanpac Packing? 60 mm vs 90 mm Selection Boundaries

Plastic Lanpac packing is a molded plastic random packing used in packed towers where engineers need gas-liquid contacting together with relatively open flow passages, low packing weight and corrosion-resistant polymer construction. DAIER’s verified engineering database contains two Lanpac size classes—60 mm and 90 mm—and these two sizes occupy meaningfully different engineering positions.

The key selection question is:

Should the project prioritize the greater contacting area of 60 mm Lanpac or the greater hydraulic openness of 90 mm Lanpac?

This is more useful than simply asking:

“Which Lanpac size is better?”

Neither size is universally better.

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1. What Is Plastic Lanpac Packing?

Lanpac belongs to the plastic random packing family.

Individual elements are randomly loaded into the packed bed rather than assembled as structured packing layers.

Its molded open geometry is intended to provide a balance between:

• gas-liquid contact;
• liquid drainage;
• gas passage;
• hydraulic capacity;
• low packed-bed weight.

It may be considered for suitable:

• absorption;
• gas scrubbing;
• stripping;
• chemical gas-treatment applications.

The actual selection depends on the specific size and process conditions.

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2. DAIER Lanpac Size Range

DAIER's verified product database contains two catalog-confirmed Lanpac classes:

The catalog also identifies these as approximately 2.3-inch / 60 mm and 3.5-inch / 90 mm Plastic Lanpac products.

These values immediately show that 60 mm and 90 mm Lanpac should not be treated as interchangeable.

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3. What Is the Main Difference Between 60 mm and 90 mm Lanpac?

The engineering trade-off is straightforward:

60 mm Lanpac

Provides:

• greater specific surface area;
• more packing elements per cubic meter;
• more potential gas-liquid contacting surface.

90 mm Lanpac

Provides:

• greater void fraction;
• lower bulk density;
• larger packing size;
• lower dry packing factor.

So the preliminary decision becomes:

60 mm = stronger mass-transfer-area direction

versus:

90 mm = stronger hydraulic-openness direction

Final performance still depends on actual operating conditions.

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4. Why Does the 60 mm Model Have More Surface Area?

The 60 mm packing contains many more individual elements in one cubic meter.

DAIER's verified data lists approximately:

• 7,060 pcs/m³ for 60 mm
• 1,765 pcs/m³ for 90 mm. 

More individual packing elements create more geometric surface within the bed.

That can provide more opportunity for:

• liquid wetting;
• surface renewal;
• gas-liquid contact.

But more packing structure also creates a different hydraulic environment.

Therefore:

More surface area is not a free performance gain.

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5. Why Is the 90 mm Model More Open?

The 90 mm model has a listed void fraction of approximately 92.5%, compared with approximately 89% for the 60 mm model.

Greater void volume may help provide:

• more open gas pathways;
• easier liquid drainage;
• greater tolerance for high gas loading;
• better tolerance for some fouling conditions.

But:

Higher void fraction does not automatically mean lower final tower pressure drop.

Pressure drop remains dependent on:

• gas flow;
• liquid load;
• bed height;
• fluid properties;
• fouling condition.

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6. When Is 60 mm Lanpac a Stronger Candidate?

The 60 mm class deserves stronger consideration when:

• mass-transfer area is important;
• the process is relatively clean;
• tower diameter is compatible;
• gas loading is not excessively high;
• available packed height is limited enough that contacting intensity matters.

Its 222 m²/m³ specific surface area gives it a substantially more area-oriented position than the 90 mm product.

Potential applications may include suitable:

• absorbers;
• chemical scrubbers;
• stripping systems

where additional contacting area has meaningful value.

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7. When Is 90 mm Lanpac a Stronger Candidate?

The 90 mm class deserves stronger consideration when:

• hydraulic openness receives greater priority;
• gas throughput is high;
• moderate fouling is expected;
• low packing weight matters;
• tower diameter is large enough for the 90 mm element size.

Its verified characteristics include:

• 144 m²/m³ surface area;
• 92.5% void fraction;
• 67 kg/m³ bulk density. 

This moves the 90 mm product toward:

capacity and openness

rather than maximum surface-area density.

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8. Why Is Bulk Density Relevant?

Bulk density influences:

• packing support load;
• total bed weight;
• transportation;
• handling.

The verified values are approximately:

• 99 kg/m³ for 60 mm
• 67 kg/m³ for 90 mm. 

For a large packed volume, this difference can become meaningful.

However, support design should not consider dry packing weight alone.

Operating load can also include:

• liquid retained in the bed;
• fouling deposits;
• other process loads.

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9. Absorption Applications

Plastic Lanpac may be considered in absorbers where the process requires:

• corrosion-resistant plastic packing;
• useful mass-transfer area;
• open gas passages;
• low-to-moderate bed weight.

For an absorber where contacting intensity is particularly important, the 60 mm model may deserve stronger preliminary consideration.

Where gas throughput becomes more important, the 90 mm model may move higher on the candidate list.

This is a screening direction—not a universal selection rule.

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10. Gas Scrubber Applications

Lanpac can also be evaluated in suitable scrubbers.

Scrubbers often require engineers to balance:

• mass transfer;
• gas capacity;
• liquid circulation;
• pressure drop;
• fouling tolerance.

A relatively clean scrubber requiring substantial contact area may favor the smaller class.

A larger high-flow or moderately fouling scrubber may benefit from evaluating the 90 mm class.

The chemistry must also be compatible with the selected polymer.

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11. Fouling Changes the Size Decision

Fouling can include:

• solids;
• scale;
• salts;
• crystallization;
• biological deposits;
• sticky process material.

Smaller packing generally creates smaller flow spaces within the overall bed.

Therefore, as fouling severity increases, the engineering value of greater openness can increase.

This may move selection from:

60 mm toward 90 mm

in some projects.

But 90 mm Lanpac is not automatically non-clogging.

Severe deposition can eventually restrict any conventional random packing.

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12. Tower Diameter Matters

A 90 mm packing element should not be selected only because hydraulic openness is desired.

If the tower diameter is relatively small, large packing elements can create:

• stronger wall effects;
• fewer elements across the tower diameter;
• less uniform random-bed behavior.

Likewise, using 60 mm Lanpac in a very large high-throughput tower may provide more surface area than the process needs while sacrificing hydraulic margin.

Therefore:

Tower diameter and packing size must be evaluated together.

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13. Plastic Material Is a Separate Decision

Selecting 60 mm or 90 mm Lanpac does not answer whether the polymer itself is suitable.

Material compatibility depends on:

• chemical species;
• concentration;
• temperature;
• oxidizing conditions;
• solvent exposure.

A correct Lanpac size manufactured from an incompatible polymer is still the wrong packing.

Plastic should never be approved solely because the process is described as:

acidic

or:

corrosive.

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14. Lanpac vs Plastic Pall Ring

Plastic Pall Ring is one of the most established random packing families.

Lanpac provides a different molded geometry and therefore a different balance of:

• surface area;
• void space;
• hydraulic behavior.

The correct comparison should use actual candidate models.

For example, comparing:

60 mm Lanpac

with:

an appropriately sized Plastic Pall Ring

is more meaningful than comparing product-family names alone.

Pall Ring may remain preferable when:

• existing operating experience is strong;
• replacement compatibility matters;
• procurement standardization is important.

Lanpac may deserve stronger consideration when its specific:

• surface-area;
• packing-factor;
• void-space

balance better matches the project.

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15. Lanpac vs Hiflow Ring

Both are plastic random packing families with size-dependent performance.

Hiflow Ring covers a broad size range from relatively small high-area products to very open large sizes.

Lanpac in the verified DAIER dataset is concentrated in:

• 60 mm;
• 90 mm

classes.

Therefore, Lanpac may be especially useful when the project is already operating within this larger industrial packing-size range.

The decision should compare actual:

• surface area;
• void fraction;
• bulk density;
• hydraulic requirement;
• fouling condition.

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16. Lanpac vs Very Open Scrubber Packing

Products such as:

• Snowflake Ring;
• Heilex-type packing;
• Tri-Pack-type packing

may place stronger emphasis on highly open flow geometry.

Lanpac can occupy a different position, particularly the 60 mm class, where significant contacting area remains important.

Therefore:

Lanpac may be attractive when the tower needs more than just maximum openness.

If severe fouling dominates the process, an even more open geometry may deserve stronger consideration.

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17. Retrofit Applications

An existing tower may evaluate Lanpac when replacing:

• older plastic random packing;
• fouled packing;
• packing creating excessive hydraulic resistance.

Before converting, review:

• existing packing type;
• existing packing size;
• packed height;
• tower ID;
• support grid;
• liquid distributor;
• required process performance.

Replacing an existing bed with the same cubic-meter volume of Lanpac does not guarantee equal:

• mass transfer;
• pressure drop;
• capacity.

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18. Support Grid Compatibility

Packing supports must:

• retain the selected Lanpac size;
• provide adequate open area;
• carry the operating bed load.

If the new packing is smaller than the existing product, support openings should be checked.

If the product is significantly lighter than the old packing, bed movement and top restraint requirements may also need review.

A hold-down system should restrain movement rather than compress the random packing bed.

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60 mm vs 90 mm Lanpac Decision Table

Verified physical-property data are from DAIER's catalog-aligned packing database.

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Common Selection Mistakes

Treating 60 mm and 90 mm Lanpac as Equivalent

Their surface area, void fraction, density and packing factor differ substantially.

Selecting 60 mm Only Because It Has More Surface Area

The process may instead be hydraulically constrained.

Selecting 90 mm Only Because It Is More Open

The tower may still require greater contacting area.

Ignoring Tower Diameter

90 mm packing can be too large for some vessel diameters.

Assuming Plastic Is Chemically Universal

Polymer compatibility must still be verified.

Replacing Another Packing by Equal Volume

Different packing geometries can produce different operating performance.

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Frequently Asked Questions

What is Plastic Lanpac packing?

Plastic Lanpac is a molded random packing used for gas-liquid contacting in suitable absorption, scrubbing and stripping systems.

What Lanpac sizes does DAIER's verified database contain?

The verified database contains 60 mm and 90 mm Plastic Lanpac models.

What is the surface area of 60 mm Lanpac?

The catalog-confirmed value is approximately 222 m²/m³.

What is the surface area of 90 mm Lanpac?

The catalog-confirmed value is approximately 144 m²/m³.

Which Lanpac size has greater void fraction?

The 90 mm product, at approximately 92.5%, compared with approximately 89% for the 60 mm model.

Is 60 mm Lanpac always more efficient?

Not automatically. It provides more geometric surface area, but actual mass transfer depends on process conditions and liquid distribution.

Is 90 mm Lanpac always better for high flow?

It has a stronger hydraulic-openness position, but final suitability still depends on actual gas and liquid loading.

Can Lanpac replace Plastic Pall Rings?

Potentially. The replacement should compare actual sizes, surface area, hydraulics, bed height, support-grid compatibility and process requirements.

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Selection Takeaway

Plastic Lanpac should be treated as a size-specific random packing family rather than as one fixed-performance product.

The verified 60 mm and 90 mm classes create a clear engineering choice:

60 mm → More Surface Area / More Contacting Intensity

90 mm → More Void Space / Lower Bed Weight / Greater Hydraulic Openness

The correct selection sequence is:

Process Duty → Mass-Transfer Requirement → Gas/Liquid Load → Fouling → Tower Diameter → 60 vs 90 mm → Polymer Compatibility

The key principle is:

Choose 60 mm or 90 mm Lanpac according to the actual tower constraint—not simply by choosing the model with more surface area or the model with more open volume.