What Is an Electroformed Screen?

An electroformed screen is a precision screening surface manufactured by electrodeposition of metal (typically nickel) onto a patterned mandrel, producing apertures with extremely tight tolerances and smooth, burr-free edges that deliver the most accurate particle separation available for vibratory screening and laboratory sieving. Unlike woven wire mesh, which is made by mechanically interlacing wires, electroformed screens are built layer by layer through an electrochemical process that deposits metal around photolithographically defined aperture patterns.

The electroforming process begins with a flat mandrel onto which a photoresist pattern is applied, defining the location, size, and shape of each aperture. The mandrel is then placed in an electroplating bath where nickel (or another metal) is deposited around the masked areas. When the plating reaches the desired thickness, the screen is separated from the mandrel. The result is a thin, uniform sheet of metal with apertures that are accurate to within 1-2 microns — a level of precision that woven wire mesh cannot achieve, especially at fine micron sizes.

Electroformed vs. Woven Wire Screen Comparison

Why Electroformed Screens Matter in Vibratory Screening

Electroformed screens fill a critical niche where aperture precision is more important than screen durability or cost:

• Unmatched aperture accuracy — With tolerances of +/- 1-2 microns, electroformed screens provide the sharpest particle size cut available. This is essential in pharmaceutical powder grading where product specifications require precise micron-level separation.
• Reduced blinding — The conical (tapered) aperture shape means each opening is wider on the exit side than the entry side. Particles that enter the aperture are less likely to become stuck because they encounter an expanding passage. This self-cleaning geometry significantly reduces blinding.
• Smooth edges for delicate materials — The burr-free aperture edges handle fragile materials without damaging particle shape, which matters in additive manufacturing powder reclamation where particle morphology must be preserved.
• Custom aperture shapes — Because apertures are photolithographically defined, electroformed screens can have round, square, hexagonal, or slot-shaped openings. Round apertures provide the most accurate volumetric size classification.

Electroformed screens are used on precision vibratory separators from Russell Finex, Sweco, and other manufacturers, as well as in test sieves meeting ASTM E11 and ISO 3310 standards.

Related Glossary Terms

• Test Sieve — Standardized lab sieve for particle size analysis
• Bolting Cloth — Fine woven fabric for precision sieving
• Sintered Mesh — Multi-layer bonded mesh for filtration
• Woven Wire Cloth — Standard interlaced wire screen media
• Aperture — The opening size in screen media
• Particle Size Distribution — The range of sizes in a material sample

Electroformed Screen FAQs

What is an electroformed screen used for?

Electroformed screens are used when the highest possible aperture accuracy is required. Common applications include pharmaceutical powder classification, laboratory test sieving, additive manufacturing powder grading, cosmetic ingredient screening, and any process where ASTM or ISO sieve tolerances must be met precisely.

How is an electroformed screen different from woven wire mesh?

Woven wire mesh is made by interlacing wires, which creates apertures that vary slightly depending on wire tension, crimp, and weaving tolerances. Electroformed screens are built atom by atom through electrodeposition, producing apertures that are photolithographically defined and accurate to within 1-2 microns. However, electroformed screens are more expensive and more fragile than woven wire.

What aperture sizes are available in electroformed screens?

Electroformed screens are typically available in aperture sizes from 1 micron to 500 microns, though the most common range for vibratory screening is 5 to 300 microns. For apertures larger than approximately 500 microns, woven wire mesh is more practical and cost-effective.