Perforated Metal Filter

Perforated Filter Tubes — The Shell Carries the Load, the Medium Sets the Rating

Rolled perforated cylinders, drums and support cores in 304 and 316L — plain cut edges, collars,

flanges or sealed end caps, with mesh-lined options where the rating comes from the medium inside.

A perforated filter element has two layers with two different jobs, and one of the most common

specification errors in filtration is treating them as one. The perforated shell carries the differential

pressure and sets the open area — it is the structure. The medium inside it — mesh, cloth or your

own pleated element — sets the micron rating and does the actual filtration. Specify a hole size

thinking it is the rating and you get an element that holds together and filters nothing. Tell us

which job the perforated layer is doing, and whether it is a finished element or a support core

for your own medium, and the specification follows from that.

The second thing that decides performance is the seam. A rolled perforated tube has exactly

one joint — the longitudinal seam weld — and it is the only place where unfiltered fluid can

bypass the medium along the length of the element. A seam that is not full-penetration, or

not cleaned and passivated, is a bypass path that no amount of correct hole size will

compensate for. Aperture shape matters here too: square and rectangular apertures

buy you more open area than round holes at the same pitch, but they give up diagonal

stiffness — and a perforated tube is loaded in hoop by the pressure across its wall. We

will tell you where that trade-off lands for your duty rather than quoting the highest

open area we can punch.

Form	Tubes and cylinders,drums,flat and curved panels—rolled to your diameter and length
Aperture	Round on 60°staggered pitch;square /rectangular on straight grid;slotted
Aperture size	[1]-[25]mm
Open area	[201-[60]%typical with round staggered;higher with square,at some cost in stiffness
Materias	304,316L,duplex stainless—matched to your housing and process fluid
Construction	Rolled perforated sheet with longitudinal seam weld;end caps,flanges,collars or plain cut edges
Layers	Single-layer perforated shell,or perforated shell with internal mesh layer
Role	Finished filter element,or support core for your own filter medium
Surface	Bright finish,pickled and passivated,or electropolished on request

Why buyers consolidate their filter elements here

Shell and medium built as one assembly. Where the rating comes from an internal mesh, the perforated shell and

the mesh are made to work as a pair rather than sourced separately and expected to fit.

The seam is inspected and recorded. The single joint on the element is treated as the critical feature it is, with

the inspection documented rather than assumed.

Aperture chosen against hoop strength, not just open area. We will quote the pattern your differential pressure

supports, and say so when a higher open area would be a mistake.

End fittings made to your housing. Plain edge, collar, flange or sealed cap — matched to how the element

locates and seals, so it does not bypass at the connection.

Send your element drawing or sample, diameter, length, aperture or rating required, medium, material and

quantity. We will confirm the pattern, the seam detail and the end fittings, quote FOB [Tianjin] and give you

a lead time — usually within [24] hours.