Thickness alone is not enough. Deformation is highly related to open area and panel size:

1. Stiffeners: If open area >45% and width >600mm, you must weld rear stiffeners (spacing 300-400mm for steel; 250-350mm for aluminum).
2. Stress Relief: Raw material must be level-rolled. After punching, secondary leveling is mandatory to release stamping stress (otherwise micro-hole plates will easily warp like waves).
3. Hole Pattern: Staggered holes distribute stress better than straight rows, reducing warping.

Q4: What are the key procurement specs to give manufacturers?

1. Use flat cold-rolled plates; require stress-relief leveling after punching. Flatness tolerance ≤2mm/m.
2. Ensure plate thickness ≤ hole diameter.
3. Add rear stiffeners if length >600mm and open area >45%.
4. Deburr all holes. (Passivate stainless steel; powder coat aluminum if not for food contact).

Q5: Any specific application advice?

• Food Sieve (304 SS): Prefer 1.0-1.5mm thickness with holes ≥φ1.5mm (balances rigidity, cleanability, and prevents residue trap).
• Exterior/Electrical Box Decoration: Keep holes ≥φ2mm (≥1.5mm for aluminum). Always add rear stiffeners for large panels to prevent visible sagging after installation.