What Is Plastic Polyhedral Hollow Ball Packing? Size Range, Applications and Selection Boundaries

Plastic Polyhedral Hollow Ball packing is a lightweight random packing formed as an open spherical or near-spherical framework with multiple ribs and internal flow passages. It is mainly considered for gas scrubbing, absorption and other gas-liquid contacting systems where corrosion-resistant plastic construction, substantial contacting area and relatively open flow paths are required.

Unlike conventional Pall Rings or saddle packing, its product geometry is built around an open hollow-ball structure.

The main engineering question is:

When does Polyhedral Hollow Ball provide a better combination of contacting area, hydraulic openness and low bed weight than conventional plastic ring packing?

It should not be selected simply because the spherical geometry appears to provide “more surface.”

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1. What Is Plastic Polyhedral Hollow Ball Packing?

Plastic Polyhedral Hollow Ball belongs to the random packing family.

Individual hollow-ball elements are loaded randomly into the tower.

Each element typically contains:

• an open external framework;
• multiple ribs;
• internal contacting structures;
• interconnected flow openings.

The geometry allows gas and liquid to move:

• around the packing;
• through the packing;
• between neighboring elements.

This creates a different packed-bed structure from conventional cylindrical rings.

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2. Why Use a Hollow-Ball Geometry?

The engineering objective is to create usable surface while keeping much of the element volume open.

Liquid can contact:

• outer ribs;
• internal surfaces;
• neighboring packing elements.

Gas can pass through multiple directions within the bed.

This attempts to balance:

Gas-Liquid Contact + Open Flow Volume

rather than maximizing solid surface alone.

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3. Verified Size Range

DAIER's verified engineering database lists Plastic Polyhedral Hollow Ball in the following nominal sizes:

• 25 mm;
• 38 mm;
• 50 mm;
• 76 mm;
• 100 mm. 

This makes it a genuine multi-size product family.

The verified dataset lists the following parameters:

One important procurement lesson follows immediately:

Do not infer all technical parameters from nominal size alone.

For example, the verified database lists a non-monotonic specific-surface-area value for the 100 mm model, so the actual approved datasheet should be reconfirmed before using such figures for final supplier comparison or design.

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4. 25 mm Polyhedral Hollow Ball

The verified 25 mm model has the highest listed surface area among the smaller confirmed models:

460 m²/m³, with approximately 90% void fraction.

This gives it a strong contacting-area position.

It may deserve consideration when:

• substantial mass-transfer area is required;
• tower diameter is suitable;
• process fluids are relatively clean;
• hydraulic load is moderate.

However, its high packing factor and large number of elements per cubic meter also mean the bed is much finer than a large open packing.

Therefore:

25 mm is not automatically the best size simply because it offers more geometric area.

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5. 38 mm Polyhedral Hollow Ball

The 38 mm model provides a verified specific surface area of approximately:

325 m²/m³

with about:

91% void fraction.

It can provide a more balanced position between:

• contacting area;
• hydraulic openness.

This size may be worth evaluating when the project wants significant surface area without using the smallest available element.

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6. 50 mm Polyhedral Hollow Ball

The verified 50 mm model provides approximately:

• 237 m²/m³ specific surface area;
• 91% void fraction;
• 52 kg/m³ bulk density. 

This places it more clearly in the industrial mid-size range.

It may be relevant where:

• gas throughput matters;
• plastic packing is required;
• mass-transfer area must remain substantial.

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7. 76 mm Polyhedral Hollow Ball

The verified 76 mm product has approximately:

• 214 m²/m³ surface area;
• 92% void fraction;
• 3,000 pieces/m³. 

Compared with smaller models, it provides:

• fewer individual elements;
• larger characteristic flow spaces;
• stronger hydraulic-openness potential.

It may therefore deserve stronger consideration when:

• gas load is higher;
• moderate fouling exists;
• tower diameter is sufficiently large.

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8. 100 mm Polyhedral Hollow Ball

The 100 mm model is a large packing element.

The verified database lists:

• 92% void fraction;
• 56 kg/m³ bulk density;
• 1,500 pieces/m³;
• dry packing factor 155 m⁻¹. 

Because the listed specific surface area does not follow the otherwise expected size trend, that parameter should be reconfirmed against the final approved product datasheet before technical procurement.

This is exactly why:

Catalog name + nominal size should never replace an approved technical specification.

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9. Why Surface Area Matters

Specific surface area represents the geometric packing surface available within a unit bed volume.

Greater area can increase opportunities for:

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

But geometric area is not equal to guaranteed effective area.

Actual utilization depends on:

• liquid distribution;
• liquid properties;
• operating load;
• wetting behavior.

Therefore, higher m²/m³ should be treated as a selection factor rather than a guaranteed efficiency value.

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10. Why Void Fraction Matters

The verified Polyhedral Hollow Ball series has approximately 90–92% void fraction across the listed sizes.

Open volume helps provide space for:

• gas passage;
• liquid drainage;
• counter-current flow.

However:

Void fraction is not the same as pressure drop.

Actual pressure drop still depends on:

• gas flow;
• liquid flow;
• packing size;
• fluid properties;
• bed height;
• fouling.

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11. Plastic Construction

Plastic construction can provide several practical advantages:

• relatively low bed weight;
• corrosion resistance in compatible environments;
• molded complex geometry;
• easy handling.

This can make Polyhedral Hollow Ball attractive in:

• FRP scrubbers;
• plastic absorption towers;
• chemical gas-treatment equipment.

However, polymer compatibility remains a separate decision.

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12. Polymer Compatibility Must Be Confirmed

Plastic packing should never be selected from pH alone.

Compatibility depends on:

• chemical species;
• concentration;
• temperature;
• oxidizers;
• solvents;
• long-term exposure.

PP may be appropriate in many aqueous chemical systems, but it should not be presented as universally resistant.

The correct sequence is:

First select suitable geometry, then confirm the polymer against the actual process chemistry.

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13. Gas Scrubber Applications

Polyhedral Hollow Ball may be considered for gas scrubbers where the project needs:

• substantial gas-liquid contact;
• lightweight plastic packing;
• corrosion resistance;
• relatively open gas passages.

Possible applications include suitable:

• chemical exhaust treatment;
• acid-gas scrubbing;
• odor-control systems;
• industrial air-treatment systems.

The correct packing size depends on whether the scrubber is primarily constrained by:

• mass transfer;
• gas capacity;
• fouling.

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14. Absorption Applications

In an absorber, liquid must effectively contact the gas phase across the packing bed.

The high geometric area available in smaller Polyhedral Hollow Ball sizes can make them interesting for absorption.

However, the project must still evaluate:

• absorption target;
• gas flow;
• liquid load;
• tower diameter;
• pressure-drop limit.

A packing with high surface area may still be wrong if the hydraulic margin is insufficient.

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15. Fouling Considerations

The hollow-ball structure provides multiple open passages.

That can offer useful tolerance compared with very fine solid or restrictive packing geometries.

However, internal ribs and openings can still accumulate:

• solids;
• biological deposits;
• scale;
• crystals;
• sticky contaminants.

Therefore:

Polyhedral Hollow Ball should not be described as non-clogging.

As fouling severity increases, larger sizes may deserve stronger evaluation.

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16. Why Size Changes Fouling Tolerance

Smaller packing creates:

• more elements;
• more contact points;
• finer overall bed structure.

This can improve contacting area but may also increase the number of locations where deposits can accumulate.

Larger packing generally provides:

• larger characteristic passages;
• fewer elements per cubic meter.

This can improve fouling tolerance in some services.

The correct decision therefore balances:

Efficiency Requirement ↔ Hydraulic Openness ↔ Fouling Tolerance

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17. Polyhedral Hollow Ball vs Plastic Pall Ring

These products represent different geometry approaches.

Plastic Pall Ring

Uses:

• an open ring body;
• wall windows;
• internal surfaces.

Polyhedral Hollow Ball

Uses:

• a spherical/open framework;
• internal ribs;
• multidirectional flow passages.

Polyhedral Hollow Ball may deserve consideration when:

• substantial contacting area;
• multidirectional open geometry;
• low plastic bed weight

are valuable.

Plastic Pall Ring may remain preferable when:

• conventional performance data;
• procurement familiarity;
• established operating history

matter more.

Neither geometry is universally superior.

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18. Polyhedral Hollow Ball vs Teller Rosette

Teller Rosette emphasizes a very open skeletal loop structure.

Polyhedral Hollow Ball can provide substantially greater contacting-area density in smaller sizes.

Therefore:

• Teller Rosette may receive stronger consideration when openness and fouling tolerance dominate;
• Polyhedral Hollow Ball may deserve stronger consideration when mass-transfer area remains more important.

The comparison must still use actual sizes rather than only family names.

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19. Polyhedral Hollow Ball vs Snowflake Ring

Snowflake Ring strongly emphasizes:

• large open flow passages;
• hydraulic robustness.

Polyhedral Hollow Ball provides a different balance by incorporating substantial internal and external contacting structure.

If the project is primarily limited by:

• severe fouling;
• very high gas flow,

Snowflake-type geometry may deserve stronger review.

If more contacting area is required without abandoning plastic random packing, Polyhedral Hollow Ball may become more relevant.

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20. Polyhedral Hollow Ball vs Hiflow Ring

Hiflow Ring provides a clear size-dependent progression from high-area small packing to very open large packing.

Polyhedral Hollow Ball uses an entirely different hollow-spherical geometry.

A meaningful comparison should evaluate:

• specific surface area;
• void fraction;
• packing size;
• bulk density;
• fouling tendency;
• gas/liquid load.

The product with the highest surface area is not automatically the correct choice.

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21. Tower Diameter Matters

Large packing such as 76 or 100 mm should not automatically be selected for high-flow service.

If the tower diameter is too small relative to packing size:

• wall effects may increase;
• bed uniformity may decrease;
• too few packing elements may span the column.

Conversely, using 25 mm packing in a large fouling-prone tower may create unnecessary:

• hydraulic resistance;
• maintenance difficulty.

Packing size must therefore be connected to tower ID.

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22. Support Grid Compatibility

The support grid must:

• retain the selected hollow-ball size;
• carry the wet packed-bed load;
• maintain adequate open area.

When replacing larger random packing with smaller Polyhedral Hollow Balls, support openings should be checked carefully.

Because plastic packing is lightweight, bed movement should also be reviewed where:

• gas velocity;
• upset conditions

could disturb the bed.

Where a hold-down is required, it should restrain movement rather than compress the packing.

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23. Retrofit Applications

Polyhedral Hollow Ball may be evaluated to replace:

• Plastic Pall Rings;
• older plastic packing;
• fouled random packing;
• heavier packing.

Possible reasons include:

• corrosion;
• weight reduction;
• changing mass-transfer requirements;
• hydraulic improvement.

However, a retrofit must review:

• old packing size;
• bed height;
• liquid distributor;
• support grid;
• tower ID;
• gas/liquid loads.

Equal cubic meters do not guarantee equivalent process performance.

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Preliminary Size Selection Guide

This is preliminary product screening rather than final hydraulic design.

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Common Selection Mistakes

Selecting the Smallest Size Because It Has More Surface Area

Greater area may reduce hydraulic or fouling margin.

Treating Every Hollow Ball Size as Equivalent

25 mm and 100 mm products create very different bed structures.

Assuming Spherical Geometry Guarantees Better Distribution

Liquid-distributor quality still matters.

Assuming Plastic Is Universally Chemical-Resistant

Polymer compatibility must be checked from actual process conditions.

Assuming High Void Fraction Means Low Pressure Drop

Pressure drop remains operating-condition dependent.

Using Catalog Data Without Final Datasheet Confirmation

If a parameter appears inconsistent with the surrounding product series, reconfirm it before procurement or design.

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Frequently Asked Questions

What is Plastic Polyhedral Hollow Ball packing?

It is an open hollow-ball plastic random packing containing multiple ribs and flow passages for gas-liquid contacting.

Is Polyhedral Hollow Ball random packing?

Yes. Individual packing elements are randomly loaded into the tower.

What sizes are available in DAIER's verified database?

The verified series includes approximately 25, 38, 50, 76 and 100 mm models.

Which size has the highest verified surface area among the 25–76 mm models?

The 25 mm model is listed at approximately 460 m²/m³.

Is smaller Polyhedral Hollow Ball always better?

No. Smaller packing can provide more area but may create greater hydraulic resistance and fouling sensitivity.

Is it suitable for gas scrubbers?

It can be a useful candidate when plastic compatibility, gas-liquid contacting and hydraulic requirements align with the product.

Is it better than Plastic Pall Ring?

Not universally. The two geometries offer different balances of surface area, bed structure, hydraulic behavior and procurement familiarity.

Is it suitable for fouling service?

Larger open sizes may provide useful tolerance for moderate fouling, but severe scale, crystallization or sticky deposits can still restrict the bed.

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Selection Takeaway

Plastic Polyhedral Hollow Ball is a distinct plastic random-packing family that uses an open hollow-spherical geometry to combine substantial contacting area with relatively open gas and liquid pathways.

Its strongest selection logic is:

Contacting Area + Open Hollow Geometry + Low Plastic Bed Weight + Compatible Corrosion Resistance

Smaller sizes move the product toward:

greater mass-transfer-area intensity

while larger sizes generally move selection toward:

greater hydraulic openness and fouling tolerance.

The proper selection sequence is:

Process Duty → Required Mass Transfer → Gas/Liquid Load → Fouling → Tower Diameter → Packing Size → Polymer Compatibility

The key principle is:

Choose Polyhedral Hollow Ball because its hollow three-dimensional structure fits the actual process requirement—not simply because it provides a large catalog surface-area number.