Porous Alumina Rods for Filtration, Diffusion and Wicking

Choose the Evaluation Around Your Process

Every porous alumina rod enquiry is really a question about a process: what has to pass through the part, under what conditions, and how you will know it works. Send the points below with your drawing and we will confirm the rest during review.

• Process Filtration or Sampling

  Tell us whether the stream is liquid or gas, what particles or solids it carries, the flow and pressure difference you need, the temperature, and the seals already installed in the housing. For the trial, agree the flow curve, the outlet target, how bypass around the sealing face will be checked, and how the rod will be cleaned between runs. A rod that filters correctly but leaks past its seal is the most common reason a filtration project stalls.

• Gas Diffusion or Aeration

  Send the gas and liquid involved, the immersion depth, the target gas flow, the operating pressure, the active surface you can fit, and the connection type. For the trial, agree how distribution will be judged, which pressure points you will record, and what maintenance criteria will tell you the diffuser is fouling. Distribution depends on the whole plenum and mounting, not on the rod alone, so the assembly drawing matters as much as the rod drawing.

• Laboratory or Wicking Component

  Give us the fluid, the uptake or flow target, the cleanliness level the application needs, the fixture the rod sits in, and the sample quantity. For the trial, agree the repeatability check, whether extractables need to be measured, and the method used to measure them. In laboratory work the pore figure is rarely the deciding number — batch-to-batch consistency and a clean part usually are.

• Hot-Gas or Chemical-Exposure Project

  Send the atmosphere or chemistry with concentrations, the temperature profile including cycles, the pressure, and the materials used for seals and supports. For the trial, agree the selected formulation and the test conditions for the whole assembly, because a material that survives the gas may still fail at the seal or the support.

Usage Instructions for Alumina Porous Ceramic

Follow the instructions for the selected component and complete assembly.

Porous Alumina Rod FAQs

1. What is a porous alumina rod used for?
   A porous alumina rod is an alumina ceramic part with a controlled open-pore structure, used to filter a liquid or gas, spread gas evenly through a vessel, or move liquid by capillary action. It is chosen when the part must pass flow rather than carry load.
2. What pore sizes are available?
   The pore structure is agreed for the selected rod rather than picked from a fixed grade list. Tell us the task — the particle you need to hold back, the gas flow you need to spread, or the liquid you need to move — and we will confirm the pore metric, the measurement method and the sample that demonstrates it.
3. Is the pore size the same as the particle size it removes?
   No. A nominal pore size is a named metric measured by a named method; it is not a maximum through-pore size and not an absolute retention rating. If you have a hard particle cut-off, tell us the challenge particle and the outlet target so the right test is agreed.
4. How do porous and dense alumina rods differ?
   Porous alumina passes gas or liquid through interconnected pores and is used for filtration, diffusion and wicking. Dense alumina carries load, locates other components and insulates electrically. They serve different functions, are not interchangeable, and are specified from separate data sheets.
5. Is alumina suitable for corrosive environments?
   It depends on the chemical, its concentration, the temperature and the exposure time — not on pH alone. Strong hot alkalis, hydrofluoric acid and some fluoride-bearing streams attack alumina. Send the full chemistry and we will confirm whether alumina, zirconia or silicon carbide should be quoted.
6. Can you supply a size that is not in the table, and what do you need to quote it?
   Yes. The listed models are paired sizes; anything else is quoted from a drawing, with lengths up to 1,000 mm and outer/inner diameters from 3 to 80 mm. Send the drawing or sketch, the function, the medium, flow and pressure difference, temperature, the seals and mating parts, and the trial or repeat quantity. A photograph of the part being replaced helps when no drawing exists.
7. Are porous alumina rods reusable?
   Yes, provided cleaning restores the required performance and the rod is undamaged. Back-flushing, chemical cleaning and ultrasonic cleaning must suit the porous formulation, the foulant and the complete assembly. Monitor flow and pressure drop against the clean baseline to judge fouling and cleaning recovery.