Metal Conjugated Ring vs Metal Intalox Saddle: Which Random Packing Should You Select?

Metal Conjugated Ring and Metal Intalox Saddle cannot be ranked with one universal rule. Their relative surface area, void fraction, dry bulk density and dry packing factor change significantly with size, and the hydraulic ranking reverses in the largest comparable size range.

At small and medium sizes, DAIER's catalog data generally show:

Metal Intalox Saddle:

• higher specific surface area;
• higher void fraction;

while Metal Conjugated Ring:

• lower dry bulk density;
• lower dry packing factor.

But near the approximately 76–80 mm physical-size range, the pattern changes:

Metal Conjugated Ring:

• higher surface area;
• slightly lower dry bulk density;

while Metal Intalox Saddle:

• much higher void fraction;
• substantially lower dry packing factor. 

Therefore:

Do not choose between Metal Conjugated Ring and Metal Intalox Saddle by family name alone. The correct answer depends strongly on the exact physical size.

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1. Direct Answer

Evaluate Metal Conjugated Ring more strongly when:

• low packed-bed weight is important;
• lower dry packing factor is desirable in the 25–50 mm range;
• a ring-type metal geometry is preferred;
• an existing Conjugated Ring tower should remain like-for-like;
• the project does not require the additional surface area of Intalox at smaller sizes.

Evaluate Metal Intalox Saddle more strongly when:

• higher geometric contacting area is valuable at 25–50 mm;
• higher catalog void fraction is preferred;
• the large physical size range is being considered;
• the substantially lower large-size packing factor is useful for the project;
• an existing saddle-type bed should remain unchanged.

The key rule is:

Small/medium size and large size lead to different conclusions.

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2. Direct and Near-Size Catalog Comparison

The catalog identifies the large Metal Intalox Saddle model as a 70 mm class, but its listed principal dimension is approximately 76.5 mm, making it a useful physical near-size comparison with the 80 mm Conjugated Ring. 

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3. 25 mm Starts with a Balanced Trade-Off

At approximately 25 mm:

Metal Conjugated Ring

• 185 m²/m³;
• 95% void;
• 216 kg/m³;
• 75,000 pcs/m³;
• 216 m⁻¹.

Metal Intalox Saddle

• 199 m²/m³;
• 96.6% void;
• 266 kg/m³;
• 127,180 pcs/m³;
• 221 m⁻¹.

The two packing factors are already very close.

But their:

• surface area;
• voidage;
• bed weight

still differ.

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4. Intalox Has Only About 8% More Area at 25 mm

Surface area:

Conjugated Ring

185 m²/m³.

Intalox Saddle

199 m²/m³.

Difference:

14 m²/m³

or approximately:

8% more area for Intalox.

This is a relatively modest advantage.

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5. Intalox Also Has Higher Void Fraction

Conjugated Ring

95%.

Intalox

96.6%.

Difference:

1.6 percentage points.

So at the 25 mm position, Intalox combines:

• slightly more area;
• more free volume.

But that does not make it lighter.

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6. Conjugated Ring Is Much Lighter at 25 mm

Bulk density:

Conjugated Ring

216 kg/m³.

Intalox

266 kg/m³.

Conjugated Ring is approximately:

19% lighter.

For a 20 m³ bed:

Conjugated

4,320 kg.

Intalox

5,320 kg.

Difference:

approximately 1 tonne of dry packing.

That can matter in retrofit structures.

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7. Packing Factor Is Nearly the Same at 25 mm

Conjugated Ring

216 m⁻¹.

Intalox

221 m⁻¹.

Difference:

only 5 m⁻¹

or roughly:

2%.

This is important.

At 25 mm, the decision is not really:

high factor vs low factor.

It is more about:

higher Intalox area/voidage vs lower Conjugated Ring bed weight.

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8. Packing Population Is Very Different

Conjugated Ring

75,000 pcs/m³.

Intalox

127,180 pcs/m³.

Intalox contains approximately:

70% more individual elements.

Yet its specific surface area is only about:

8% greater.

Therefore:

Pieces per cubic meter are not proportional to total geometric surface area.

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9. Metal Thickness Is Also Different

Representative construction is approximately:

Conjugated Ring 25

25 × 25 × 0.5 mm.

Intalox Saddle 25

25.9 × 12.6 × 0.4 mm. 

Despite the thicker Conjugated Ring material:

its packed-bed bulk density is still lower.

That shows how strongly overall geometry affects kg/m³.

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10. 38 vs 40 mm Widens the Difference

The next comparison uses:

• 38 mm Conjugated Ring;
• 40 mm-class Intalox Saddle.

This is a near-size comparison, not an exact nominal match.

The Intalox model's listed principal dimension is approximately:

35.4 mm.

So the two are physically close enough for preliminary comparison.

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11. Intalox Has About 30% More Surface Area

Conjugated Ring 38

116 m²/m³.

Intalox 40 class

151 m²/m³.

Difference:

35 m²/m³

or approximately:

30% more area for Intalox.

This is now a much more meaningful surface-area advantage.

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12. Intalox Also Has Higher Voidage

Conjugated Ring

96%.

Intalox

97.4%.

Difference:

1.4 percentage points.

Again Intalox combines:

• more surface area;
• higher void fraction.

But the price is a much heavier packed bed.

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13. Conjugated Ring Is About 35% Lighter

Bulk density:

Conjugated Ring

131 kg/m³.

Intalox

203 kg/m³.

Difference:

72 kg/m³.

For a 30 m³ bed:

Conjugated

3,930 kg.

Intalox

6,090 kg.

Difference:

approximately 2.16 tonnes.

This is substantial.

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14. Conjugated Ring Also Has Lower Packing Factor

Conjugated Ring

131 m⁻¹.

Intalox

163.2 m⁻¹.

Conjugated Ring is approximately:

20% lower.

So around this size range, the family distinction becomes clearer:

Intalox → more area + more voidage

versus:

Conjugated Ring → much lighter + lower factor.

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15. Voidage Does Not Predict Packing Factor

This comparison is especially useful because Intalox has:

97.4% void

versus Conjugated Ring:

96%.

Yet Intalox also has the higher:

163.2 vs 131 m⁻¹ packing factor.

Therefore:

higher void fraction does not automatically mean lower dry packing factor.

The two parameters describe different aspects of packing geometry.

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16. 50 mm Keeps the Same Basic Pattern

At exactly 50 mm:

Metal Conjugated Ring

• 86 m²/m³;
• 96% void;
• 97 kg/m³;
• 9,772 pcs/m³;
• 97 m⁻¹.

Metal Intalox Saddle

• 97 m²/m³;
• 97.9% void;
• 169 kg/m³;
• 15,550 pcs/m³;
• 103.9 m⁻¹. 

This comparison is especially clean because:

the nominal size is directly matched.

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17. Intalox Has About 13% More Area at 50 mm

Surface area:

97 vs 86 m²/m³.

The saddle provides approximately:

13% more geometric area.

That is useful, but no longer an overwhelming difference.

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18. Intalox Has Almost Two Percentage Points More Voidage

Intalox

97.9%.

Conjugated Ring

96%.

Difference:

1.9 percentage points.

Again Intalox is the more open catalog bed by total free-volume percentage.

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19. Yet Conjugated Ring Is Dramatically Lighter

Bulk density:

Conjugated Ring

97 kg/m³.

Intalox

169 kg/m³.

Conjugated Ring is approximately:

43% lighter.

For a 30 m³ bed:

Conjugated

2,910 kg.

Intalox

5,070 kg.

Difference:

approximately 2.16 tonnes.

That can be a major structural advantage.

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20. Packing Factor Is Still Slightly Lower for Conjugated Ring

Conjugated

97 m⁻¹.

Intalox

103.9 m⁻¹.

Difference:

about 7%.

So at 50 mm:

Conjugated Ring remains the lighter, lower-factor option.

Intalox remains:

the higher-area, higher-voidage option.

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21. The 50 mm Comparison Is More Balanced Than 38–40 mm

At 38–40 mm:

• area difference is about 30%;
• factor difference about 20%.

At 50 mm:

• area difference is about 13%;
• factor difference about 7%.

Therefore:

the two families begin to converge around 50 mm.

But the large-size comparison does not simply continue that convergence.

Instead:

the ranking reverses.

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22. The ~76–80 mm Physical Class Changes the Story

Now compare:

Metal Conjugated Ring

80 × 80 × 0.8 mm.

Metal Intalox Saddle

70 mm nominal class with listed dimension approximately:

76.5 × 42.5 × 0.5 mm.

These are not the same geometry and not exactly the same nominal size.

But their largest principal dimensions are close enough for a useful:

large physical-size comparison. 

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23. Conjugated Ring Now Has More Surface Area

Conjugated Ring 80

81 m²/m³.

Intalox large-size model

61 m²/m³.

Conjugated Ring provides approximately:

33% more geometric surface area.

This is a ranking reversal.

At smaller sizes:

Intalox had more area.

At the large physical class:

Conjugated Ring has more area.

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24. But Intalox Has Much Higher Voidage

Conjugated Ring

95%.

Intalox

98.7%.

Difference:

3.7 percentage points.

This is the largest void-fraction difference in the comparison.

At large size:

Intalox becomes dramatically more open by catalog free-volume percentage.

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25. Conjugated Ring Remains Slightly Lighter

Bulk density:

Conjugated Ring

94.5 kg/m³.

Intalox

106 kg/m³.

Conjugated Ring is approximately:

11% lighter.

The weight advantage remains, but it is much smaller than at 38–50 mm.

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26. Packing Factor Reverses Completely

This is the key result.

Conjugated Ring

95 m⁻¹.

Intalox

63.5 m⁻¹.

Now Intalox has the lower packing factor by approximately:

33%.

At smaller sizes:

Conjugated Ring had the lower factor.

At the large physical class:

Intalox takes the lower-factor position.

This is the central new engineering knowledge node.

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27. Why This Reversal Matters

A simplistic rule might say:

Conjugated Ring is the lower-factor alternative to Metal Intalox Saddle.

That would work reasonably well around:

• 25;
• 38–40;
• 50 mm.

But it fails at the large physical size.

Therefore the better rule is:

Conjugated Ring generally has the lower packing factor through the small and medium size range, but the ranking can reverse at the largest comparable size.

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28. Surface-Area Ranking Reverses at the Same Time

Interestingly, two rankings change together.

At small/medium size:

Intalox

more surface area.

Conjugated Ring

lower packing factor.

At large size:

Conjugated Ring

more surface area.

Intalox

lower packing factor.

That creates a nearly mirrored reversal.

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29. The Large-Size Trade-Off Is Therefore Completely Different

Near the 76–80 mm physical class:

Choose Conjugated Ring more readily for

• greater geometric area;
• slightly lighter bed.

Evaluate Intalox more strongly for

• much higher void fraction;
• substantially lower packing factor.

This is the opposite of the smaller-size decision logic.

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30. Why Metal Thickness Matters at Large Size

Representative construction:

Conjugated Ring 80

approximately:

0.8 mm.

Intalox large model

approximately:

0.5 mm. 

This difference in construction is one reason the two large-size beds should not be evaluated from nominal diameter alone.

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31. Yet Thicker Conjugated Ring Is Still Slightly Lighter

Despite:

0.8 vs 0.5 mm

representative metal thickness, bulk densities are:

94.5 vs 106 kg/m³.

This is another reminder that:

sheet thickness alone cannot predict packed-bed weight.

Element geometry and packing population remain important.

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32. Packing Population Is Quite Close at Large Size

Conjugated Ring

3,980 pcs/m³.

Intalox

4,690 pcs/m³.

Difference:

about 18%.

The populations are much closer than at smaller sizes.

Yet the packing-factor difference is large.

Again:

similar pieces/m³ does not mean similar hydraulic geometry.

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33. Full Size-Dependent Ranking

This table is the main selection map.

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34. Which Is Better for High Surface-Area Priority?

It depends on size.

25–50 mm

Metal Intalox Saddle has the higher catalog surface area.

Large physical size

Metal Conjugated Ring becomes higher in area:

81 vs 61 m²/m³.

Therefore:

neither family owns the surface-area advantage across the entire range.

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35. Which Is Better for Low Packing-Factor Priority?

Again:

it depends on size.

Small and medium:

Conjugated Ring.

Large physical class:

Metal Intalox Saddle.

This is why exact model selection matters.

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36. Which Is Better for Lightweight Towers?

Metal Conjugated Ring is lighter in all the direct and near-size comparisons used here.

However the advantage changes from:

• substantial at 38–50 mm;

to:

• relatively small at the largest size.

So packed-bed weight should still be checked from:

exact kg/m³ values.

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37. Which Is Better for Fouling?

There is no universal winner.

Conjugated Ring and Intalox Saddle differ in:

• surface geometry;
• flow passages;
• element orientation.

Actual fouling behavior depends on:

• solids;
• crystals;
• sticky materials;
• process chemistry;
• liquid distribution.

Neither product should be described as:

• clog-proof;
• self-cleaning.

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38. Do Not Convert Packing Factor Directly into Pressure Drop

Whether comparing:

97 vs 103.9 m⁻¹

or:

95 vs 63.5 m⁻¹

the catalog dry packing factor is not actual tower ΔP.

Actual pressure drop depends on:

• gas/vapor flow;
• liquid rate;
• fluid properties;
• packed height;
• tower diameter.

Use factor as:

a hydraulic screening input—not a final operating guarantee.

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39. Existing Conjugated Ring Should Not Be Replaced with Intalox as Routine Maintenance

At 50 mm, the conversion would change:

• surface area;
• voidage;
• bed weight;
• packing factor;
• packing population.

Even if both are:

50 mm stainless-steel random packing

they do not create the same bed.

The conversion should be treated as:

a retrofit.

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40. Existing Intalox Should Not Be Converted Only to Reduce Weight

Conjugated Ring can substantially reduce dry bed weight in the mid-size range.

But it can also reduce:

• surface-area density;
• void fraction.

Therefore the project must review:

• process duty;
• hydraulics;
• available packed height.

Weight saving alone does not prove technical equivalency.

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41. Same Packed Height Does Not Guarantee Same Process Performance

Changing packing family changes:

• geometric surface area;
• wetting pattern;
• voidage;
• hydraulic characteristics.

Therefore:

same tower + same nominal size + same bed height

does not guarantee:

same process result.

Family conversion requires an engineering review.

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42. Alloy Compatibility Comes Before Geometry Optimization

This comparison concerns packing shape.

The exact alloy still must be suitable for:

• chemical species;
• concentration;
• temperature;
• chlorides;
• corrosion mechanism.

Do not choose a superior geometry in:

an unsuitable alloy.

Material and geometry are separate selection layers.

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43. Supplier Quotations Should Compare Exact Construction

Do not compare only:

USD/m³.

A lower price may simply reflect a different:

• geometry;
• thickness;
• metal mass.

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Decision Table

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Common Selection Mistakes

Assuming Intalox Always Has More Surface Area

False at the largest physical-size comparison.

Assuming Conjugated Ring Always Has Lower Packing Factor

False near the 76–80 mm physical class.

Assuming Higher Voidage Means Lower Packing Factor

At 25–50 mm, Intalox has higher voidage but higher packing factor.

Ignoring Nominal vs Actual Dimensions

A nominal 70 mm Intalox Saddle has a listed principal dimension of approximately 76.5 mm.

Comparing 38 vs 40 mm as Exact Same Size

It is a near-size comparison.

Using Pieces/m³ as a Hydraulic Metric

Element population does not determine packing factor.

Using Metal Thickness Alone to Estimate Bed Weight

Geometry also matters.

Switching Families During Routine Top-Up

That is a retrofit.

Treating Packing Factor as Actual Operating ΔP

Operating data are required.

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Frequently Asked Questions

Which has more surface area at 25 mm?

Metal Intalox Saddle:

199 vs 185 m²/m³.

Which is lighter at 25 mm?

Metal Conjugated Ring:

216 vs 266 kg/m³.

Which has lower packing factor at 25 mm?

Metal Conjugated Ring, but only slightly:

216 vs 221 m⁻¹.

What happens around 38–40 mm?

Intalox provides more area and more voidage, while Conjugated Ring is much lighter and has lower dry packing factor.

What happens at 50 mm?

The same basic pattern remains:

• Intalox — 97 m²/m³ / 97.9% void;
• Conjugated — 86 m²/m³ / 96% void.

But Conjugated is much lighter:

97 vs 169 kg/m³

and lower in factor:

97 vs 103.9 m⁻¹.

What happens in the large physical-size range?

The ranking reverses.

Conjugated Ring provides:

81 vs 61 m²/m³ surface area

while Intalox provides:

98.7 vs 95% void

and:

63.5 vs 95 m⁻¹ dry packing factor.

Why compare 80 mm Conjugated Ring with a 70 mm-class Intalox Saddle?

Because the Intalox catalog lists the latter's principal dimension at approximately 76.5 mm, making the two physically close large-size candidates.

Which is lighter in that large-size comparison?

Conjugated Ring is slightly lighter:

94.5 vs 106 kg/m³.

Does lower dry packing factor guarantee lower real pressure drop?

No. Actual gas and liquid operating conditions are required.

Can one directly replace the other?

They can be evaluated as retrofit alternatives, but should not be treated as like-for-like replacements.

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Selection Takeaway

Metal Conjugated Ring vs Metal Intalox Saddle demonstrates one of the most important rules in random-packing selection: a family-level ranking can reverse as size changes.

At approximately 25 mm:

Conjugated → 185 m²/m³ / 95% void / 216 kg/m³ / 216 m⁻¹

versus:

Intalox → 199 m²/m³ / 96.6% void / 266 kg/m³ / 221 m⁻¹.

Here:

Intalox gives slightly more area and voidage; Conjugated Ring gives lower weight and slightly lower packing factor.

At 38–40 mm:

Conjugated → 116 m²/m³ / 96% void / 131 kg/m³ / 131 m⁻¹

versus:

Intalox → 151 m²/m³ / 97.4% void / 203 kg/m³ / 163.2 m⁻¹.

The distinction becomes stronger.

At 50 mm:

Conjugated → 86 m²/m³ / 96% void / 97 kg/m³ / 97 m⁻¹

versus:

Intalox → 97 m²/m³ / 97.9% void / 169 kg/m³ / 103.9 m⁻¹.

Conjugated Ring remains the lighter, lower-factor geometry.

But near the ~76–80 mm physical class:

Conjugated → 81 m²/m³ / 95% void / 94.5 kg/m³ / 95 m⁻¹

versus:

Intalox → 61 m²/m³ / 98.7% void / 106 kg/m³ / 63.5 m⁻¹. 

Now the ranking reverses:

Conjugated Ring becomes the higher-area option.

Intalox Saddle becomes the higher-voidage, lower-packing-factor option.

Therefore the key engineering principle is:

Never classify Metal Conjugated Ring as universally lower-factor or Metal Intalox Saddle as universally higher-area. The correct ranking depends on exact physical size.

The correct selection sequence is:

Tower Diameter → Physical Size Class → Exact Geometry → Required Surface Area → Hydraulic Constraint → Packed-Bed Weight → Alloy / Thickness → Fouling → Compare Exact Conjugated / Intalox Data → Internals Review