Microelectronics Semiconductor Filter Cartridge

Design & Construction

The capsule is thermally welded shut. There is no housing joint to seal and no elastomer anywhere in the flow path, which is why the seal row in the specification table is empty — buyers occasionally read that as an omission, and it is not.

For high-purity work this removes two recurring problems at once: a source of extractables, and an assembly step where a pinched or badly seated seal quietly lets unfiltered fluid through. The trade is that the capsule cannot be serviced. There is no element to lift out, so when differential pressure reaches its limit the whole unit is replaced.

Inside the welded body the element is pleated rather than depth-wound. Pleating is what gives a 72 mm body enough surface area to pass 1 to 10 GPM; a depth wrap in the same envelope would reach its differential pressure limit far sooner.

Non-standard sizes and connections

Both are available, and it is worth knowing what they involve. Every combination of cage diameter and connection adaptor is a separate mold. Pullner cuts those in-house and prototypes non-standard end caps and frames on a 3D printer first, so the answer is rarely no — but a genuinely new geometry is a tooling conversation rather than a catalog selection, and it moves the lead time.

Send the body dimensions and the fitting standard with your inquiry and engineering will tell you whether it runs on an existing mold before you commit to anything.

Sizing & Selection

Length sets capacity, not rating. All five bodies filter to the same grade; a 202 mm capsule simply runs longer before differential pressure climbs. Buyers on short change-out intervals usually step up a length before they step up a micron, because a coarser grade changes what reaches the tool.

Connection choice carries more weight, because it cannot be changed in the field. NPT threads suit fixed pipework and existing threaded manifolds. Swage compression fittings suit tube runs and are the more common request on wet benches and tool feeds, where the line is stainless or PFA tube rather than pipe.

When a cartridge and housing is the better answer

This is a point-of-use device, and there are four situations where it is the wrong specification:

• Above 50 °C or 4.1 bar. Both are hard limits on this body.
• Continuous high-volume duty. Past roughly 10 GPM the economics move to a multi-cartridge housing.
• Below 1 µm. This series starts at 1 µm; finer work belongs to the pleated membrane cartridge range.
• Gas. This capsule is rated for liquid service only.

Chemical compatibility depends on the specific fluid, its concentration and its working temperature rather than on the material name alone. Send the fluid and the operating conditions with your inquiry and Pullner will confirm compatibility before quoting.

Replacing an Imported Capsule

Most inquiries for this product come from plants already running a Pall, Parker, 3M CUNO or Pentair capsule that has become slow to source or expensive to hold. Cross-referencing one is straightforward, but it needs six things, and an inquiry carrying all six is usually quoted the same day:

• The part number printed on the capsule body
• Body diameter and overall length
• Inlet and outlet fitting — thread standard or tube size
• Micron grade currently in service
• The fluid, its concentration and its working temperature
• Flow rate and the change-out interval you are getting today

Photographs of the capsule and its fittings help more than a description.

Qualifying the replacement

Every element is tested in Pullner’s own laboratory, from incoming raw material to finished goods, on a bench that includes a PMI pore size analyzer, an SEM resolving to 3 nm, ICP-MS, an ion chromatograph and an IFTS single-pass rig. Batch test documentation is available on request, and buyers qualifying a second source usually ask for it before the sample rather than after.

Up to two samples ship worldwide free of charge, with freight paid by the customer. Standard minimum order is 50 pieces and standard lead time is 10 working days, across 30+ production lines running more than 4,000 elements a day.

Who it is for

Process and equipment engineers at semiconductor, electronics chemical and display plants evaluating a second-source point-of-use capsule for liquid chemical or UPW lines.

Typical operating conditions

• Micron rating: 1–10 µm
• Media: polypropylene (PP), glass fiber, PES or PTFE
• Flow: 1–10 GPM
• Max differential pressure: 60 psi (4.1 bar)
• Max temperature: 122°F (50°C)
• Body: 72 mm diameter (customized sizes available); lengths 114, 138, 152, 183 or 202 mm
• Inlet / outlet: a range of adaptor options, including 1/4" NPT, 3/8" NPT, 1/2", 1/4" Swage, 3/8" Swage and 1/2" Swage; other sizes need a new mold
• O-ring / gasket: not applicable (capsule format)

Recommended Pullner product family

Capsule filter elements, N/S series. For duty finer than 1 µm, review membrane filter cartridges. Application context: microelectronics filtration solutions.

What to send before quotation or sample

• Fluid / media
• Flow rate
• Micron rating
• Temperature
• Pressure
• Existing housing or current model
• Maintenance / change-out cycle
• Validation requirement

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