Plastic Intalox Saddle vs Plastic Cascade Mini Ring: Which Random Packing Should You Select?

Plastic Intalox Saddle and Plastic Cascade Mini Ring represent two fundamentally different ways of balancing contacting area and packed-bed hydraulics. DAIER's catalog-confirmed 25, 38, 50 and 76 mm data show that Plastic Intalox Saddle provides dramatically greater specific surface area, while Plastic Cascade Mini Ring consistently provides much lower dry packing factor and usually a lighter packed bed. 

The comparison becomes especially interesting above 25 mm because Intalox Saddle simultaneously provides:

• higher surface area;
• higher void fraction;

yet still has:

• much higher dry packing factor.

Therefore the correct question is not:

Which packing is more open?

It is:

Does the process need the much higher geometric contacting area of Intalox Saddle, or does it benefit more from the substantially lower packing-factor position and lighter bed of Cascade Mini Ring?

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1. Direct Answer

Choose Plastic Intalox Saddle more readily when:

• very high geometric surface-area density is important;
• mass-transfer duty is demanding;
• the service is sufficiently clean to use the additional contacting area;
• hydraulic margin is available;
• an existing Intalox Saddle tower already performs successfully.

Evaluate Plastic Cascade Mini Ring more strongly when:

• lower dry packing factor is an important screening priority;
• lower packed-bed weight is valuable;
• a coarser hydraulic position is desired;
• fouling or solids make extremely high surface-area density less attractive;
• the process can tolerate the lower geometric area.

The fundamental trade-off is:

Plastic Intalox Saddle → Much Higher Geometric Surface Area

versus:

Plastic Cascade Mini Ring → Much Lower Dry Packing Factor + Generally Lower Bed Weight

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2. DAIER Direct Size Comparison

 

The overall pattern is remarkably clear:

Intalox Saddle keeps the high-area position.

Cascade Mini Ring keeps the low-packing-factor position.

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3. 25 mm Starts with a Conventional Trade-Off

At 25 mm:

Plastic Intalox Saddle

• 288 m²/m³ surface area;
• 85% void fraction;
• 102 kg/m³ bulk density;
• 97,680 pcs/m³;
• 473 m⁻¹ dry packing factor.

Plastic Cascade Mini Ring

• 228 m²/m³;
• 90% void;
• 65 kg/m³;
• 81,500 pcs/m³;
• 312.8 m⁻¹.

Here the trade-off behaves roughly as many engineers might expect.

Intalox provides:

more surface area

while CMR provides:

more voidage + lower packing factor + lower bed weight.

But this simple relationship does not continue at larger sizes.

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4. Intalox Has About 26% More Surface Area at 25 mm

Surface area:

Intalox Saddle

288 m²/m³.

Cascade Mini Ring

228 m²/m³.

Difference:

60 m²/m³

or approximately:

26% more geometric area.

That is a substantial increase.

Where the process needs a fine, high-area plastic random packing:

25 mm Intalox Saddle has a strong contact-area position.

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5. But CMR Has Higher Voidage at 25 mm

Void fraction:

Intalox

85%.

CMR

90%.

CMR therefore provides:

5 percentage points more free volume.

This makes the 25 mm comparison intuitive:

high-area saddle bed

versus:

more open lower-factor ring bed.

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6. CMR Is Dramatically Lighter at 25 mm

Bulk density:

Intalox

102 kg/m³.

CMR

65 kg/m³.

Difference:

37 kg/m³.

For a 20 m³ bed:

Intalox

20 × 102 = 2,040 kg

CMR

20 × 65 = 1,300 kg

Difference:

approximately 740 kg of dry packing.

That can matter in:

• existing-tower retrofits;
• FRP equipment;
• support-limited towers;
• freight-sensitive projects.

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7. 25 mm Packing Factor Also Strongly Favors CMR

Intalox Saddle

473 m⁻¹.

Cascade Mini Ring

312.8 m⁻¹.

Difference:

160.2 m⁻¹.

CMR's dry packing factor is roughly:

34% lower.

This makes CMR a strong hydraulic-screening candidate.

However:

34% lower packing factor does not mean 34% lower operating pressure drop.

Actual ΔP requires tower operating conditions.

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8. 38 mm Completely Changes the Voidage Story

At 38 mm:

Intalox Saddle

• 265 m²/m³;
• 95% void;
• 63 kg/m³;
• 25,200 pcs/m³;
• 405 m⁻¹.

Cascade Mini Ring

• 132.5 m²/m³;
• 91% void;
• 54 kg/m³;
• 27,200 pcs/m³;
• 175.8 m⁻¹.

Now Intalox has both:

• higher surface area;
• higher void fraction.

Yet CMR still has dramatically lower packing factor.

This is where the comparison becomes especially useful.

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9. Intalox Has Exactly Twice the Surface Area at 38 mm

The data are:

265 vs 132.5 m²/m³.

That is exactly:

2× the geometric surface area.

This is a very large difference.

A tower requiring substantial potential wetted area may therefore place 38 mm Intalox Saddle much higher in the candidate list.

But its dry packing factor is also:

405 vs 175.8 m⁻¹.

The two geometries occupy very different positions.

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10. Higher Voidage Does Not Give Intalox Lower Packing Factor

This is the crucial point.

At 38 mm:

Intalox

95% void.

CMR

91%.

So Intalox actually has:

more free bed volume.

Yet its dry packing factor is:

405 m⁻¹

versus:

175.8 m⁻¹

for CMR.

Therefore:

Higher void fraction does not automatically mean lower packing factor.

These two catalog parameters measure different aspects of packing geometry.

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11. Why Is This Possible?

Void fraction describes:

the percentage of packed-bed volume not occupied by solid material.

It does not fully describe:

• surface orientation;
• element profile;
• flow-path complexity;
• obstruction geometry;
• interaction between adjacent elements.

Intalox Saddle can therefore have:

• very high total free volume;

while still creating:

• a much higher packing-factor geometry.

That is why engineering selection cannot rely on voidage alone.

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12. 38 mm CMR Is Only Slightly Lighter

Bulk density:

Intalox

63 kg/m³.

CMR

54 kg/m³.

Difference:

9 kg/m³.

Compared with the very large surface-area and packing-factor differences, packed-bed weight is a secondary distinction at this size.

The real decision is:

265 m²/m³ high-area Intalox

versus:

175.8 m⁻¹ low-factor CMR.

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13. CMR Actually Has More Pieces at 38 mm

Packing population:

Intalox

25,200 pcs/m³.

CMR

27,200 pcs/m³.

CMR has:

2,000 more pieces per cubic meter.

Yet it provides only:

half the specific surface area.

This proves another important point:

More individual packing elements do not automatically mean more geometric surface area.

Element shape matters much more.

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14. 50 mm Makes the Difference Even More Dramatic

At 50 mm:

Plastic Intalox Saddle

• 250 m²/m³;
• 96% void;
• 75 kg/m³;
• 9,400 pcs/m³;
• 323 m⁻¹.

Plastic Cascade Mini Ring

• 114.2 m²/m³;
• 92.7% void;
• 43 kg/m³;
• 10,740 pcs/m³;
• 143.1 m⁻¹.

Once again Intalox provides:

• much more surface area;
• higher voidage.

CMR provides:

• much lower weight;
• much lower dry packing factor.

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15. 50 mm Intalox Has More Than Twice the Surface Area

Surface-area comparison:

250 vs 114.2 m²/m³.

Intalox provides approximately:

2.19 times the geometric surface area.

That is not a marginal difference.

For high mass-transfer-area duty:

the two products should not be treated as equivalent 50 mm random packings.

Their geometry is fundamentally different.

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16. Intalox Also Has Higher Voidage at 50 mm

Intalox

96%.

CMR

92.7%.

Difference:

3.3 percentage points.

This makes the result counterintuitive.

Intalox simultaneously has:

• more than twice the surface area;
• more free volume.

Yet it still has more than twice the dry packing factor:

Intalox

323 m⁻¹.

CMR

143.1 m⁻¹.

Again:

Void fraction cannot predict packing factor.

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17. 50 mm CMR Is Much Lighter

Dry bulk density:

Intalox

75 kg/m³.

CMR

43 kg/m³.

Difference:

32 kg/m³.

CMR is approximately:

43% lighter by dry bulk density.

For a 30 m³ packed bed:

Intalox

2,250 kg.

CMR

1,290 kg.

Difference:

approximately 960 kg of dry packing.

That can be important in retrofit projects.

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18. Again, CMR Has More Pieces but Less Area

At 50 mm:

Intalox

9,400 pcs/m³.

CMR

10,740 pcs/m³.

CMR contains more pieces.

Yet its total geometric surface area is:

114.2 vs 250 m²/m³.

This is one of the clearest examples showing why:

Pieces per cubic meter should never be used as an efficiency metric.

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19. 76 mm Continues the Same Pattern

At 76 mm:

Intalox Saddle

• 200 m²/m³;
• 97% void;
• 60 kg/m³;
• 3,700 pcs/m³;
• 289 m⁻¹.

Cascade Mini Ring

• 90 m²/m³;
• 92.9% void;
• 44 kg/m³;
• 3,420 pcs/m³;
• 112.3 m⁻¹.

The two element populations are now fairly close.

But their:

• area;
• packing factor

remain radically different.

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20. Large Intalox Still Maintains Extremely High Area

At 76 mm:

Intalox

200 m²/m³.

CMR

90 m²/m³.

Intalox provides approximately:

2.22 times as much geometric surface area.

This is remarkable for two products in the same nominal size class.

It demonstrates how strongly saddle geometry can preserve contacting area even as packing size becomes coarse.

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21. Large Intalox Also Has Higher Void Fraction

At 76 mm:

Intalox

97%.

CMR

92.9%.

Difference:

4.1 percentage points.

Yet packing factor remains:

Intalox

289 m⁻¹.

CMR

112.3 m⁻¹.

So the same key lesson holds even at the largest matched size.

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22. CMR Packing Factor Falls Much Faster with Size

Compare the series.

Plastic Intalox Saddle

25 mm — 47338 mm — 40550 mm — 32376 mm — 289 m⁻¹.

Plastic Cascade Mini Ring

25 mm — 312.838 mm — 175.850 mm — 143.176 mm — 112.3 m⁻¹.

CMR moves much more strongly toward a:

low dry-packing-factor position

as size increases.

That is one of its clearest engineering characteristics in this comparison.

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23. By 76 mm the Packing-Factor Gap Is Huge

At 76 mm:

289 vs 112.3 m⁻¹.

CMR's catalog dry packing factor is approximately:

61% lower

than Intalox Saddle.

Again, this does not mean operating pressure drop will be exactly 61% lower.

It means:

the two products occupy very different hydraulic geometry positions and require proper operating-condition evaluation.

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24. Full-Series Surface-Area Comparison

Intalox wins the surface-area comparison:

at every matched size.

And the advantage becomes particularly large above 25 mm. 

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25. Full-Series Void-Fraction Comparison

The ranking reverses after 25 mm.

This is important because it proves:

CMR's lower packing factor is not simply the result of having higher catalog voidage.

Above 25 mm, it actually has lower void fraction.

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26. Full-Series Packing-Factor Comparison

Here the result is completely consistent:

Cascade Mini Ring has the lower verified dry packing factor at every matched size.

 

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27. Which Is Better for High Mass-Transfer-Area Priority?

Plastic Intalox Saddle has the overwhelmingly stronger geometric position.

Especially at:

• 38 mm;
• 50 mm;
• 76 mm,

it provides roughly:

two times or more

the geometric surface area of comparable CMR models.

Therefore Intalox deserves stronger consideration when:

• high potential wetted area;
• contact intensity

are major priorities.

But geometric area alone does not guarantee tower efficiency.

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28. Which Is Better for Low-Pressure-Drop Screening?

Plastic Cascade Mini Ring has the stronger dry packing-factor position across the entire matched series.

This makes it especially interesting where:

• gas throughput;
• allowable pressure drop;
• hydraulic margin

are major constraints.

Actual pressure drop still requires:

• gas velocity;
• liquid rate;
• gas/liquid properties;
• packed height.

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29. Which Is Better for Weight-Sensitive Towers?

CMR is lighter at every matched size:

• 25 mm — 65 vs 102 kg/m³;
• 38 mm — 54 vs 63;
• 50 mm — 43 vs 75;
• 76 mm — 44 vs 60.

Its weight advantage is particularly strong at:

• 25 mm;
• 50 mm.

This can matter for:

• FRP scrubbers;
• old support structures;
• retrofit towers.

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30. Which Is Better for Fouling?

There is no universal winner.

Intalox's very high geometric surface area can be valuable in clean service.

But as fouling increases, engineers should ask whether all that additional area can remain:

• accessible;
• wetted;
• unblocked.

CMR's lower packing-factor position and lighter, lower-profile geometry may deserve stronger screening in some fouling-sensitive services.

However neither packing is:

• non-clogging;
• self-cleaning.

Severe fouling may require a different packing family or process solution.

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31. Existing Intalox Tower: When Might CMR Be Worth Evaluating?

A CMR retrofit can make sense when the existing tower faces:

• excessive hydraulic resistance;
• gas-throughput limitation;
• structural weight concern;
• fouling problems where extremely high surface-area density is no longer desirable.

For example at 50 mm:

250 → 114.2 m²/m³ area

is a very large reduction.

But:

323 → 143.1 m⁻¹ packing factor

is also a very large change.

Therefore this is a major geometry retrofit—not a minor substitution.

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32. Existing CMR Tower: When Might Intalox Be Worth Evaluating?

Intalox may deserve review when:

• more contacting area is needed;
• process duty has increased;
• available packed height is limited;
• hydraulic margin is sufficient.

At 38 mm:

132.5 → 265 m²/m³

doubles geometric area.

But dry packing factor also rises:

175.8 → 405 m⁻¹.

That trade-off must be justified by actual process duty.

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33. Same Nominal Size Does Not Mean Equivalent Packing

The 50 mm products illustrate this perfectly.

Both are around:

50 mm

yet one provides:

250 m²/m³

and the other:

114.2 m²/m³.

Their packing factors are:

323 vs 143.1 m⁻¹.

Therefore:

“50 mm plastic random packing” is not an engineering specification.

Packing family matters enormously.

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34. The Element Proportions Are Very Different

For example, the verified 50 mm entries use approximately:

Plastic Intalox Saddle

50 × 25 × 1.5 mm

Plastic Cascade Mini Ring

50 × 25 × 1.5 mm

Interestingly, the gross listed dimensions are the same in this case. 

Yet their:

• surface area;
• voidage;
• packing population;
• packing factor

are completely different.

This makes an especially strong point:

Even identical nominal envelope dimensions do not make two random-packing geometries equivalent.

Internal shape controls the bed.

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35. 38 mm Shows the Same Thing

Both verified 38 mm products use approximately:

38 × 19 × 1.2 mm

envelope dimensions. 

Yet:

Intalox

265 m²/m³95% void405 m⁻¹.

CMR

132.5 m²/m³91% void175.8 m⁻¹.

So:

same envelope dimensions can still produce radically different packed beds.

That is one of the strongest product-selection insights in this article.

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36. Do Not Automatically Keep the Same Packed Height

If converting between the two families, do not assume:

same size + same bed height = same performance.

The geometric area can differ by more than:

2×.

The retrofit should review:

• required removal or separation duty;
• gas flow;
• liquid flow;
• allowable ΔP;
• tower diameter;
• available bed height.

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37. Tower Diameter Still Comes Before Packing Family

Before choosing between:

• 25;
• 38;
• 50;
• 76 mm,

confirm that the size is suitable for the tower diameter.

Large 76 mm packing in a small tower can produce:

• significant wall effects;
• insufficient random distribution.

The correct sequence is:

Tower ID → Suitable Packing Size → Intalox vs CMR Geometry

not:

Choose a favorite packing family first.

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38. Polymer Compatibility Is a Separate Decision

This comparison concerns geometry.

Actual material may need to be selected from suitable polymer grades depending on project requirements.

Compatibility depends on:

• chemical species;
• concentration;
• operating temperature;
• oxidizers;
• solvents.

Do not assume:

plastic = chemically compatible.

The exact polymer must be verified.

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Decision Table

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Common Selection Mistakes

Assuming Higher Void Fraction Means Lower Packing Factor

38, 50 and 76 mm directly disprove this.

Choosing Intalox Only Because It Has More Surface Area

Hydraulic margin still matters.

Choosing CMR Only Because It Has Lower Packing Factor

The process may require the much higher contacting area of Intalox.

Assuming CMR Always Has Higher Voidage

False above 25 mm in this matched series.

Using Pieces/m³ as a Surface-Area Metric

At 38 and 50 mm, CMR has more pieces but dramatically less area.

Treating Identical Envelope Dimensions as Equivalent Packing

38 and 50 mm show how wrong this can be.

Converting Packing Factor Directly into Pressure Drop

Actual operating conditions are required.

Keeping the Same Packed Height After Geometry Conversion

This can materially change process performance.

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Frequently Asked Questions

Which has more surface area, Plastic Intalox Saddle or Plastic Cascade Mini Ring?

Plastic Intalox Saddle has higher verified surface area at every matched 25, 38, 50 and 76 mm size. 

How large is the difference?

At 38 mm, Intalox has exactly twice the verified surface area: 265 vs 132.5 m²/m³.

At 50 mm, the values are 250 vs 114.2 m²/m³.

Which has higher void fraction?

At 25 mm, CMR has higher voidage: 90% vs 85%.

At 38, 50 and 76 mm, Intalox has higher voidage.

Which has lower dry packing factor?

Cascade Mini Ring at every matched size.

What is the 50 mm comparison?

Plastic Intalox Saddle:

• 250 m²/m³;
• 96% void;
• 75 kg/m³;
• 9,400 pcs/m³;
• 323 m⁻¹.

Plastic CMR:

• 114.2 m²/m³;
• 92.7% void;
• 43 kg/m³;
• 10,740 pcs/m³;
• 143.1 m⁻¹.

Which is lighter?

Cascade Mini Ring at every matched size in this dataset.

Does CMR necessarily have lower pressure drop?

Its dry packing factor is substantially lower, but actual operating pressure drop requires tower-specific gas and liquid conditions.

Why can Intalox have higher void fraction but higher packing factor?

Because void fraction and packing factor describe different geometric properties. Total free volume does not fully characterize flow-path complexity or surface geometry.

Can CMR directly replace Intalox Saddle?

Do not treat the conversion as like-for-like. Surface area and packing factor can change by more than a factor of two.

Which is better for a scrubber?

Selection depends on required contacting duty, allowable pressure drop, gas/liquid loading, fouling, tower diameter and polymer compatibility.

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Selection Takeaway

Plastic Intalox Saddle vs Plastic Cascade Mini Ring is a particularly useful comparison because it disproves the assumption that high void fraction and low packing factor must always move together.

At 25 mm:

Intalox → 288 m²/m³ / 85% void / 102 kg/m³ / 473 m⁻¹

versus:

CMR → 228 m²/m³ / 90% void / 65 kg/m³ / 312.8 m⁻¹.

Here the trade-off is conventional:

Intalox gives more area; CMR gives more openness and lower factor.

But at 38 mm:

Intalox → 265 m²/m³ / 95% void / 63 kg/m³ / 405 m⁻¹

versus:

CMR → 132.5 m²/m³ / 91% void / 54 kg/m³ / 175.8 m⁻¹.

At 50 mm:

Intalox → 250 m²/m³ / 96% void / 75 kg/m³ / 323 m⁻¹

versus:

CMR → 114.2 m²/m³ / 92.7% void / 43 kg/m³ / 143.1 m⁻¹.

At 76 mm:

Intalox → 200 m²/m³ / 97% void / 60 kg/m³ / 289 m⁻¹

versus:

CMR → 90 m²/m³ / 92.9% void / 44 kg/m³ / 112.3 m⁻¹. 

So above 25 mm:

Intalox provides both more surface area and more void fraction.

Yet:

Cascade Mini Ring still provides dramatically lower dry packing factor.

That leads to the key engineering principle:

Never infer hydraulic packing factor from surface area or void fraction alone. Random-packing geometry must be evaluated as a complete structure.

The correct selection sequence is:

Tower Diameter → Size Class → Required Contacting Area → Hydraulic Constraint → Fouling → Packed-Bed Weight → Compare Exact Intalox / CMR Data → Polymer Compatibility → Internals Review