Where it fits
This all-PFA housing goes on semiconductor wet-process chemical and ultrapure water lines, taking a single cartridge on the standard 222 flat interface. It solves what a stainless housing cannot: any metal on the wetted surface becomes part of the process metal background, and an advanced node has no room for that background.
Key characteristics
The body is injection-moulded PFA with no weld seams and no dead legs, so mechanical polishing simply does not apply — a stainless housing needs polishing to bring its surface area down, while PFA never has the problem in the first place. The wetted path sees only PFA and the O-rings; the locking ring, union nuts and the eight fasteners all sit outside the flow path.
The fool-proof locking-ring closure is an operational design. The cartridge locks into the bowl first, and bowl and cartridge then come out as one unit. The operator never touches the element and cannot fit it the wrong way round — remove contact and misorientation as variables and the micro-contamination added at every change-out falls sharply.
Choosing between options
The two housings on this site do entirely different jobs:
| Item | All-PFA single-cartridge housing (this) | Stainless multi-bag vessel |
|---|---|---|
| Body material | Injection-moulded PFA, no metal on wetted surfaces | 304 or 316L stainless steel |
| Capacity | One cartridge in 5" / 10" / 20" / 30" | 2 to 24 bags, size #1 or #2 |
| Connections | 1" or 3/4" in semiconductor fluoropolymer fittings | DN80 to DN250 flanges |
| Design pressure / temperature | 0.75 MPa @ 25 °C / 100 °C | 1.0 MPa / 150 °C |
| Choose it when | High-purity chemistry and UPW, metal cleanliness first | High-flow continuous duty, change-out speed first |
Operation & change-out
At change-out, bowl and cartridge come off together and the wetted path is never opened on the floor. The 222 flat interface accepts standard third-party cartridges, so the housing does not lock you to one model. Two fluoroelastomer O-ring options are offered; state the actual chemistry at enquiry for strongly oxidising or hot service. The vent on top and drain at the bottom use the same fitting family as the ports.