Nomex Filter Bags for Zinc Oxide Industry: High-Temperature & Chemical-Resistant Dust Filtration Solutions

The Need for Reliable Filtration in Zinc Oxide Production

Zinc oxide (ZnO) is widely used in rubber, ceramics, coatings, and pharmaceuticals. Its production typically involves high-temperature processes such as indirect (French) or direct (American) methods, which release fine particulate dust and metallic vapors into the air. To ensure environmental compliance and protect downstream equipment, efficient dust filtration systems are crucial.

Among the available filter media, Nomex® (Aramid) filter bags are particularly well-suited to the demands of the zinc oxide industry.

Why Nomex? Key Material Characteristics

Nomex is a meta-aramid fiber developed by DuPont, known for its outstanding thermal stability and chemical resistance. Below are the properties that make it a preferred material in ZnO dust collection:

• 🔥 High Temperature Resistance:
  Continuous operation at up to 204°C (400°F), with peaks up to 220°C (428°F) — ideal for ZnO furnaces and reactors.
• 🧪 Good Chemical Resistance:
  Nomex resists mild acids and alkalis, making it suitable for environments with metallic fumes or sulfur-containing compounds.
• 💨 Excellent Dimensional Stability:
  Nomex maintains structural integrity under stress, minimizing bag elongation or shrinkage.
• 🌬️ Good Air Permeability:
  Allows for high filtration efficiency while maintaining acceptable pressure drop across the dust collector.
• 🔄 Long Service Life:
  Nomex bags often last 1.5 to 2 times longer than conventional polyester bags in high-temperature settings.

Application Scenarios in Zinc Oxide Plants

Nomex filter bags are widely used in the following parts of a zinc oxide plant:

Enhancing Nomex Performance

To further improve filtration performance in ZnO applications, Nomex filter bags can be:

• ✅ Treated with PTFE membrane coating: for anti-stick and ultra-fine dust filtration
• ✅ Designed with anti-collapse rings: for better structural support
• ✅ Used with pulse-jet or reverse-air cleaning systems: depending on dust load

The high-temperature, chemically active environment in zinc oxide manufacturing demands filter bags with superior endurance. Nomex filter bags offer the right combination of thermal resistance, filtration efficiency, and durability, making them a cost-effective and technically sound solution for the ZnO industry.

At Omela Filtration, we provide customized Nomex bag solutions with options for membrane coatings, reinforcement, and optimized sizes — ensuring long service life and environmental compliance.