The recovery of Aluminum Dust with a “WET Mix Immersion Separator”

Nationally Recognized Testing Laboratory (NRTL).
What requirements does OSHA have regarding NRTL’s?

OSHA standard, which are law, contain requirements for testing and certification by NRTL’s.

An explosion proof vacuum cleaner and dust collector must bear an NRTL certification.  In this case it is Class II, Division 1, Group E.

This certification applies to the entire assembled piece of equipment and not only for the components.

The “Wet Mix” or also commonly called “Immersion Separator” uses liquids to neutralize, or render inert, metallic dusts.  In this case Mineral Oil can be used for all commercial alloys with the exception of Zirconium.

To recover Zirconium dust, water is the only neutralizing agent that should be used.   

On the other hand, water should not be used to neutralize aluminum.  If water is the neutralizing agent used to recover aluminum dust then hydrogen gas can be generated.  If this is the case then a device “valve” can be installed onto the piece of equipment to evacuate the hydrogen gas.

As per NFA 484, it is also suggested that NRTL certified equipment be used.  In this case an explosion proof portable vacuum cleaner for the recovery of aluminum dust, or any other metallic dust, into a dry collection bag as long as the quantity to be recovered is less than 5 lbs.

The recovered metallic dust must be disposed of after a maximum 8 hr shift.

Following this type of procedure not only complies with the Authorities Having Jurisdiction (AHJ), but also with the workplace Canadian Center for Occupational Health & Safety (CCOHS) or Occupational Health & Safety Administration (OSHA)
Rocco Mariani

Specialist in Hazloc Housekeeping and Recovery of Combustible/Conductive Dust and Flammable Liquids


ATEX Category 1/3D Certified Industrial Vacuum Cleaners

ATEX Category 1/3D Industrial Vacuum Cleaners are certified by a Notified Body: 

  • Outer part: Cat. 3 (Zone 22) 
  • Inner part: Cat. 1 (Zone 20) 

This certificate has been obtained by following the "good manufacturing practices." 

Tiger-Vac's ATEX Cat. 3 (Zone 22) industrial vacuum cleaners are safe for the recovery of combustible dust in every day maintenance in work areas. 


CD-25L (DT) EX (MFS) Promo


CD-25L (DT) EX (MFS):

Discounted for a limited time


Class I, Division 1, Group D T3C and Class II, Division 1, Groups F and G

  • Legally certified explosion proof/dust ignition proof by a notified body
  • Optional HEPA or ULPA Filter.
  • Muffler and manometer included
  • Equipped with Manual Filter Shaker (MFS)
  • Designed for general maintenance
  • For dry recovery only
  • All stainless steel construction (except cart)
  • Detachable Recovery Tank with a capacity of 7.4 gallons (28 liters)
  • Complete tool kit included

Click here for more information on this model.

Aluminum Dust Inertization Demo

Above is Tiger-Vac's latest video in a series on safely recovering aluminum dust. The above demonstrates how 20 kg (44 l) of aluminum dust is rendered inert by immersion in a liquid bath using a Wet Type recovery Vacuum Cleaner system. Be sure to visit our YouTube Channel for more videos and demonstrations: https://www.youtube.com/user/TigerVacInc

Assembly demonstration of CD/SS-IT 11l EX

Presentation and assembly of Tiger-Vac's interceptor unit CD/SS-IT 114L EX. This legally certified, high-pressure explosion proof vacuum cleaner system meets NFPA standards. For Wet typedust recovery, it recovers and neutralizes conductive dusts into a liquid immersion bath. Its coalescing filter element is contained in a see-through Lexan housing, to facilitate maintenance and operation.  

Housekeeping and recovery of Combustible/Conductive Dusts: A Big Step in the Right Direction

Until today the certification of Hazloc Portable Vacuum Cleaners and Dust Collectors as per the Ex OSHA/NRTL system, the IECEx Scheme and the European ATEX system covers only the possibility to use the equipment in hazardous locations/areas in presence of combustible/conductive dusts, but does not cover the possibility to use the equipment to recover these dusts.

Today we are proud to inform you that all Tiger-Vac EX certified vacuum cleaners have an additional certification: the inner parts of the Portable Vacuum Cleaners and Dust Collectors are certified ATEX Category 1 for providing a very high protection level allowing the safe recovery of combustible/conductive dusts.

Incidents were reported regarding, for example, ATEX Zone 22 “Vacuums”, not approved by the Authorities Having Jurisdiction, catching on fire and jeopardizing the health and safety of workers when this unsafe equipment is used for recovering combustible/conductive dusts in the work place.

At Tiger-Vac we feel that Safety Has No Compromise!

You are here