What Is a Brass Screen?

A brass screen is a woven wire screen cloth made from copper-zinc alloy wire (typically 65-70% copper, 30-35% zinc), used in vibratory screeners where non-sparking properties, static dissipation, or non-ferrous composition is required. Brass is classified as a non-sparking material, meaning it does not produce incendiary sparks when struck against hard surfaces. This makes brass screen cloth essential for vibratory screening operations that handle flammable powders, combustible dusts, or materials processed in explosive atmospheres classified under ATEX or NEC hazardous location standards.

The most common brass alloy used for screen cloth is C26000 (cartridge brass, 70% Cu / 30% Zn), which offers excellent ductility for wire drawing and weaving. Brass wire has good conductivity that dissipates static charges generated by particle-to-wire friction during screening, reducing the risk of electrostatic discharge (ESD) ignition. Brass screen cloth is available from approximately 4 mesh to 325 mesh, though fine-mesh brass is less common than fine-mesh stainless steel. ScreenerKing and other manufacturers supply brass screens for specialized applications on Sweco, Kason, Midwestern Industries, and other vibratory separators.

Brass Screen Properties

Why This Matters in Vibratory Screening

Brass screen fills a critical safety role in vibratory screening for hazardous environments. In facilities where combustible dust or flammable vapors are present, the wrong screen material can be an ignition source.

• Explosion prevention — Brass is classified as a non-sparking material under ASTM F3325 and meets ATEX Zone 20/21/22 requirements. When processing combustible dusts like grain flour, sugar powder, aluminum fines, or pharmaceutical intermediates, brass screen eliminates the ignition risk from sparks produced by steel-on-steel contact.
• Static dissipation — Brass has electrical conductivity approximately 28% that of pure copper, far higher than stainless steel. This conductivity dissipates electrostatic charges generated by powder particles sliding across the screen surface, preventing the static buildup that can discharge as an ignition-capable spark in dry powder environments.
• Non-ferrous requirement — Some applications require non-ferrous screen material to avoid ferrous contamination in the final product. Brass screen ensures no iron-based particles enter the product stream, which is important in electronics, certain chemical processes, and non-ferrous metal powder screening.
• Limitations — Brass has lower tensile strength and abrasion resistance than stainless steel, resulting in shorter screen life under aggressive conditions. It is susceptible to stress corrosion cracking in the presence of ammonia or amines (season cracking). Brass is not suitable for acidic environments, ammonia-bearing products, or high-temperature applications above 260°C.

Related Glossary Terms

• Phosphor Bronze Screen — Another non-sparking copper alloy with superior fatigue resistance
• 304 Stainless Steel — The standard screen material for general-purpose screening
• Corrosion Resistance — Material's ability to resist chemical degradation
• Fatigue Life — Vibration cycles before wire failure, relevant to brass screen longevity
• Screen Cloth — The filtering surface material in vibratory screeners

Brass Screen FAQs

Why use brass screen in vibratory screening?

Brass screen is used when processing flammable powders, explosive dusts, or materials in hazardous atmospheres (ATEX/NEC Class I and II). Brass is non-sparking and dissipates static charges that could otherwise ignite combustible dust. Common applications include screening of grain flour, metal powders, pharmaceutical intermediates, and chemical powders in explosion-proof facilities.

Is brass screen suitable for food processing?

Brass is used in some food processing applications, particularly grain milling and flour sifting, where its non-sparking properties are valued. However, brass is not as widely approved for food contact as stainless steel, and copper content may cause discoloration in certain food products. For food applications not requiring non-sparking properties, 304 or 316 stainless steel is generally preferred.