Structured packing is corrugated sheet or wire mesh stacked into ordered blocks that fit the column cross-section. It gives a lower pressure drop and more separation per metre than random packing, which is why it dominates distillation, vacuum and high-purity service. Rongjian makes structured packing in ceramic, metal and plastic, in corrugated-sheet and wire-mesh types.
The material follows the duty. Ceramic structured packing resists strong acid and alkali and runs to about 800°C, for hot corrosive towers. Metal structured packing in SS304, SS316, SS316L and carbon steel carries high capacity and the strength for vacuum columns, as perforated corrugated sheet or fine wire mesh for the sharpest separation. Plastic structured packing in PP and other polymers covers cold, corrosive streams and scrubbing.
These are typical production figures for Rongjian structured packing in ceramic, metal and plastic. Y elements use a 45-degree corrugation angle and X elements a 30-degree angle; full data per model is on the matching datasheet.
| PACKING TYPE | MATERIAL | MODEL | SPECIFIC SURFACE (M²/M³) | VOID FRACTION (%) | BULK DENSITY (KG/M³) | MAX TEMP (°C) | KEY FEATURE |
|---|---|---|---|---|---|---|---|
| Ceramic Corrugated | CERAMIC | 125Y | 125 | 90 | 320 | 800 | Acid & high-temperature, low surface area |
| Ceramic Corrugated | CERAMIC | 250Y | 250 | 80 | 420 | 800 | Balanced separation and capacity |
| Ceramic Corrugated | CERAMIC | 350Y | 350 | 78 | 470 | 800 | Higher efficiency for hot corrosive towers |
| Ceramic Corrugated | CERAMIC | 450Y | 450 | 72 | 520 | 800 | High efficiency, acid service |
| Ceramic Corrugated | CERAMIC | 550Y | 550 | 74 | 620 | 800 | High surface area |
| Ceramic Corrugated | CERAMIC | 700Y | 700 | 72 | 650 | 800 | Maximum separation per metre |
| Metal Perforated Corrugated | METAL | 125Y / X | 125 | 98 | 53 | 800+ | General-purpose, high capacity |
| Metal Perforated Corrugated | METAL | 250Y / X | 250 | 97 | 108 | 800+ | Most common distillation grade |
| Metal Perforated Corrugated | METAL | 350Y / X | 350 | 94 | 125 | 800+ | Higher efficiency separation |
| Metal Perforated Corrugated | METAL | 500Y / X | 500 | 92 | 180 | 800+ | High surface area, sharp separation |
| Metal Wire-Mesh (Gauze) | METAL | 250 (AX) | 250 | 97 | 50 – 150 | 800+ | High purity, low liquid rates |
| Metal Wire-Mesh (Gauze) | METAL | 500 (BX) | 500 | 97 | 100 – 295 | 800+ | Vacuum distillation, fine separation |
| Metal Wire-Mesh (Gauze) | METAL | 700 (CY) | 700 | 87 | 140 – 410 | 800+ | Maximum theoretical stages per metre |
| Plastic Perforated Corrugated | PLASTIC | 125 | 125 | 98 | 37 | 60 – 280* | Lightweight, low pressure drop |
| Plastic Perforated Corrugated | PLASTIC | 250 | 250 | 97 | 75 | 60 – 280* | Corrosive scrubbing and absorption |
| Plastic Perforated Corrugated | PLASTIC | 350 | 350 | 94 | 105 | 60 – 280* | Higher efficiency, corrosive duty |
| Plastic Perforated Corrugated | PLASTIC | 500 | 500 | 92 | 150 | 60 – 280* | High surface area |
* Plastic maximum temperature depends on the polymer: general-purpose PP around 100°C, up to roughly 280°C for PVDF, PTFE, PFA and FEP grades.
Structured packing is built for separation efficiency at a low pressure drop, so it concentrates in distillation, vacuum and high-purity service. The four duties below cover most of what buyers order it for.
We have made structured packing since 2010, out of Pingxiang, the largest packing production base in China. Ceramic firing, metal sheet stamping and welding, and plastic forming all run under one roof, across hundreds of column specifications in petrochemical, chemical, pharmaceutical and environmental projects.
We make corrugated-sheet packing in ceramic, metal and plastic, and fine wire-mesh packing in stainless steel, in surface areas from 125 to 700 square metres per cubic metre. Each block is cut and assembled to the column diameter, with X or Y corrugation angles to suit the duty.
The two types cover most columns. Corrugated-sheet packing, in ceramic, metal or plastic, is the workhorse for distillation and absorption, robust and good across a wide range of loads; fine wire-mesh, or gauze, packing gives the highest separation and the lowest pressure drop, which is what vacuum and high-purity service need. We make both and help match the type to the column.
Every block is engineered to the column rather than trimmed from stock. For a large tower the bed is split into segments that pass through a manhole and lock together inside, and the corrugation angle and the surface area are set to the separation, a steeper angle for capacity or a finer surface for sharper splits. Send the column diameter, the service and the duty and the bed is built to fit it.
No block leaves without a check and a report. For structured packing that means the sheet thickness, the surface area, the corrugation and the assembled dimensions, and on metal types the welds, all measured against the spec and written up for the order. The packing that reaches the column is then the packing on the datasheet, with the figures to prove it where a duty is guaranteed.
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Match it to the chemistry and temperature. Ceramic structured packing takes hot corrosive acid service and runs to about 800°C, but it is brittle. Metal in stainless or carbon steel handles vacuum and high-capacity columns. Plastic in PP and similar polymers suits cold corrosive scrubbing at lower cost.
Structured packing is stacked corrugated sheet or wire mesh, and random packing is loose rings and saddles poured in. Structured packing gives a lower pressure drop and more separation per metre, so it suits vacuum and high-purity columns. Random packing handles fouling and load swings better and costs less.
Corrugated sheet covers most distillation and absorption work at a fair cost. Wire mesh gives the highest surface area and the sharpest separation, so it goes into vacuum and high-purity towers where every theoretical stage counts.
The letter is the corrugation angle. A Y type sits near forty-five degrees for better mass transfer, an X type near thirty degrees for a lower pressure drop. The number is the surface area in square metres per cubic metre, so a 250Y carries more area than a 125Y.
Yes. We carry ceramic, all common steels, and PP and related polymers, matched to the acid, alkali, solvent or oxidizer in the stream and to the operating temperature.
Yes. We cut and assemble each block to your column diameter and supply the matching bed limiter and support. Standard surface areas run from 125 to 700 square metres per cubic metre, with custom sizing on request.
Structured packing is chosen when separation efficiency and a low pressure drop matter more than tolerance to fouling. The choice comes down to material, form and corrugation angle.
The stream decides the material. Ceramic structured packing resists strong acid and alkali and holds to about 800°C, for hot corrosive towers, though it is brittle and should not see sharp thermal shock. Metal in stainless or carbon steel gives high capacity and the mechanical strength for vacuum and large columns; carbon steel is cheaper for non-corrosive duty, while stainless avoids chloride attack. Plastic in PP and related polymers handles cold corrosive scrubbing and absorption at low cost, with general-purpose PP usually kept under about 120°C.
Two metal forms cover most work. Perforated corrugated sheet is the general-purpose choice, with surface areas from 125 to 500 square metres per cubic metre and a good balance of capacity, efficiency and cost. Wire-mesh, or gauze, packing has a much finer surface that wets easily at very low liquid rates, which gives the most theoretical stages per metre and the lowest pressure drop. It is the standard for vacuum distillation and high-purity separation, where efficiency outweighs cost.
Each surface area comes in two angles. A Y type sits near forty-five degrees and gives better mass transfer, an X type near thirty degrees and gives a lower pressure drop and higher capacity. Vacuum and pressure-drop-critical columns often take the X angle, while separation-critical columns take the Y. The model name combines the two, so a 250Y is a forty-five-degree element with 250 square metres of surface per cubic metre.
A higher surface area, such as 500 or 700, packs more contact area into the bed and lifts separation, but it also raises pressure drop and lowers capacity. A lower surface area, such as 125 or 250, moves more vapour at a lower resistance. Match the surface area to your number of theoretical stages and your allowable pressure drop, then confirm the column diameter so the blocks are cut to fit without wall gaps.
