Perforated & Expanded Metal

Perforated vs expanded metal — which form?

Perforated sheet offers defined round or shaped holes in flat plate — precise open area and thickness for support and diffusion. Expanded metal is slit and stretched to a diamond pattern — lightweight rigidity and directional flow. Support for filter mesh usually means perforated plate; some guards and panels use expanded metal.

Round hole staggered pattern is most common for support plates; square or slot patterns suit specific flow or screening aesthetics — state pattern from your process spec or send sample plate for reverse match.

Hole size, pitch and open area

Hole diameter, center pitch and staggered vs straight pattern determine open area and strength. Provide target open area or hole size from process spec; flow direction and allowable differential pressure help validation. Slot patterns available for some duties.

Open area percentage interacts with plate thickness: high open area with thin plate may deflect under mesh lamination pressure — we flag combinations that need thicker plate or stiffening ribs on DFM review.

Thickness, flatness and cut size

Thickness affects strength and weight; flatness tolerance matters when mesh is spot-welded or laminated on top. Specify sheet size, blank outline and tolerance class. Large blanks may require seam weld for oversize — noted on drawing review.

Expanded metal louver orientation may matter for directional flow in diffuser plates — note flow arrow on drawing. Carbon steel perforated support with stainless mesh overlay is possible but requires explicit approval of galvanic or process compatibility.

Pairing with woven or sintered media

Combined discs and packs use perforated plate as core with mesh or sintered overlay — common in extruder and inline holders. Quote as assembly with layer stack defined; see Filter Discs & Packs and Custom Fabrication.

Blank size limits depend on press or laser bed — oversized blanks may ship as welded sections with joint location approved on drawing. Deburring of hole edges may be required before mesh lamination — specify edge condition.

What should I send for an accurate perforated metal quotation?

Hole diameter, pitch, pattern, thickness, alloy, blank dimensions, tolerance and quantity.

Standard catalog hole patterns ship faster; new tooling for proprietary hole pitch incurs tool cost and MOQ — confirmed before order. Repeat releases can align coil or sheet lot for traceability.

MOQ and lead time

MOQ depends on thickness, pattern and cut size — confirmed per quote. Standard patterns ship faster than custom tool holes; tool cost stated when new perforation pattern is required.

Used as core in filter discs and extruder packs — see Filter Discs & Packs. Mesh-over-perforated assemblies with complex outlines are quoted under Custom Fabrication with layer stack on the drawing.

Related products and next steps

Perforated sheet family products appear below for standard support plate starting points. Combined mesh-over-perforated discs and packs are covered under Filter Discs & Packs; complex welded panels under Custom Fabrication. Woven Wire Mesh overlays require aligned alloy and open-area review — send both mesh and plate specs on one drawing when quoting assemblies. Include hole pattern, thickness, blank size and quantity for standalone perforated or expanded metal supply.

When perforated plate is only the core in a laminated disc, send total assembly thickness and sealing face tolerance — not only hole pattern on the plate layer. Custom hole pitch may require new tooling and MOQ; standard staggered round patterns ship faster for support-only duty. Deburring, passivation and flatness class should match your lamination or bolt-up process — state edge condition and inspection needs on the RFQ.

Expanded metal diamond orientation may affect directional flow in diffuser or guard panels — mark flow arrow on the drawing when asymmetry matters. Oversize blanks beyond standard press width may ship as welded sections with joint location approved before cutting — note if the joint may sit in the active filtration zone. Carbon steel support with stainless mesh overlay requires explicit process approval on corrosive duty.