Three-quarter view of permanganate media filter with visible purple pellets

Air Filters and Chemical Filtration

Permanganate-Impregnated Media Filter

A deep-bed chemical filter using purple permanganate-impregnated alumina pellets to oxidize selected corrosive and odorous gases.

Oxidizing Alumina Pellets
Visible Purple Media
Formaldehyde and H2S Control
Deep Contact Bed

Request a Quote Browse Products

Product Introduction

The filter is filled with porous activated-alumina spheres impregnated with a controlled permanganate chemistry. Contaminants diffuse into the pellet and are oxidized to retained reaction products, making the media useful for hydrogen sulfide, sulfur dioxide, formaldehyde and certain mercaptans. Perforated stainless retainers keep the granular bed uniform and allow air to cross the full depth. The media is supplied in a sealed refillable cassette so spent pellets can be managed separately from the housing.

Key Features

Purple pellets make the permanganate media visually distinguishable from ordinary black carbon.

Oxidative reaction provides targeted capture for selected sulfur and aldehyde contaminants.

High-porosity alumina supports impregnant distribution throughout each pellet.

Refillable cassettes allow the media to be replaced without discarding the full steel enclosure.

Customer Product Concerns

Some reactive gases have limited capacity on untreated carbon and require an oxidizing adsorbent with adequate contact time.

Formaldehyde passes through a standard particulate and general carbon stage.Permanganate-treated alumina oxidizes the aldehyde inside a porous reactive pellet.

Media identity is confused during multi-stage service.The characteristic purple pellet colour and labelled cassette distinguish this stage from black carbon.

Shallow media trays provide insufficient reaction time.A deep packed bed increases residence time and available oxidizing capacity.

Spent loose media is difficult to remove cleanly from an air handler.A closed refillable cassette contains the pellets during handling and replacement.

Typical Applications

Museum and archive air treatmentWastewater odour controlHealthcare formaldehyde controlIndustrial corrosion-control roomsLaboratory make-up air

Technical Parameters

Representative specifications for a permanganate-impregnated alumina filter are listed below.

Core Material	Porous activated alumina pellets impregnated with potassium permanganate chemistry
Panel Thickness	150–300 mm overall deep-bed cassette depth
Effective Width	305–610 mm nominal filter width
Maximum Length	Up to 610 mm nominal filter height
Steel Facing Thickness	0.8–1.2 mm 304 stainless-steel or coated steel cassette
Core Density	720–900 kg/m³ packed impregnated-alumina bulk density
Thermal Conductivity	0.18–0.35 W/(m·K) for the packed alumina bed
Surface Finish	Brushed stainless steel or chemical-resistant baked powder coat
Joint Type	Refillable perforated cassette with secured fill port and continuous face gasket
Customization	Available based on the intended application and operating environment.

Available Options

Full-size or half-size cassetteBlended carbon and permanganate stages304 stainless-steel refillable frameOutlet dust-control scrim

Planning a Permanganate-Impregnated Media Filter specification?

Send us your dimensions, installation conditions, performance targets and required surface finish.

Talk to Our Team