top of page

EtO Sterilization for the 21st Century

Chelsea loading EOGas4 transparent.png

The temperature-controlled EOGas 4 cabinet along with Andersen's bag and cartridge technology maximizes gas efficiency and minimizes gas usage; only 17.6g of gas per cycle.

Our secret to high efficiency

Our secret to high efficiency


Unlike traditional Ethylene oxide sterilizers which involve rigid metal chambers and large external tanks of gas, the EOGas 4 system uses gas-impermeable sterilization bags and unit dose 100% EtO cartridges.

By eliminating chamber dead space, EO-FCT employs only a tiny fraction of the EtO used in other systems.

Easy installation

Easy installation


EOGas 4 requires minimal installation: just a 1" PVC hose to the outside with the wall plate provided. There are no water or vacuum lines required. Sterilization and aeration happen in the same cabinet.

Only 17.6g of gas per load

Only 17.6g of gas per load


No more 50lb tanks!

EOGas 4 provides optimal use of gas thanks to its unique EO-FCT architecture. 

EOGas 4 is gentler with the environment and with your pocket

EoGas 4 Sterilizer

EOGas4 Sterilizer

The EOGas 4 is a 50°C or 30°C cycle, benchtop cabinet with active aeration. Four cycles are available, the fastest being just 3½ hours at 50°C, all delivering 10-6 SAL. Turn-around time for delicate medical items has never been this fast.

EOGas 4 compared to other low-temperature sterilizers


  • The widest range of material and product compatibility (other than foods, liquids, or drugs).

  • Ability to sterilize long, narrow, and multi-channel lumens.

  • All sides and surfaces are sterilized; no “shadowing”

  • Compatible with all common packaging materials.

  • Will not damage delicate instruments like harsh chemical sterilants.

EO-FCT Ethylene Oxide Flexible Chamber Technology

EOGas 4 parts explanation

Small EtO Cartridge uses 80% less gas than other sterilizers

Adjustable cycle lengths

Sterilization and aeration cycles are fully adjustable to meet the needs of your specific loads

Small footprint and Easy Installation

Tabletop design requires only a 240v outlet and a 1" exhaust line.

The Sterilization Bag is effectively the sterilization chamber, increasing the efficiency of the sterilant

The Aeration in the same Chamber

There is no need to transfer products to a separate area

Ethylene Oxide Flexible Chamber Technology (EO - FCT):  The reliability of EtO using only 17.6 g/cycle

See how our exclusive EO-Flexible Chamber Technology works.


EO-FCT uses active aeration to flush the sterilization bag with a constant flow of fresh air at the end of the sterilization cycle. Items that retain EtO may require additional aeration. With EOGas, sterilization and aeration occur in the same chamber. There is no need to transfer products to a separate aeration area

EO-FCT Sterilization vs Traditional EtO Sterilization

EO-FCT Sterilization vs Traditional EtO Sterilization
  • True 10-6, 12-log sterilization

  • Small tabletop footprint

  • Only 17.6g of EtO per load

  • Easy Installation and maintenance

  • Affordability

  • Operator training for the life of the sterilizer

  • Sterilization and aeration in the same chamber.

  • No need to wait for a large chamber to get full

Using the EOGas 4 Sterilizer


The key feature of EO-flexible chamber system is the sterilization bag.

The bag is the sterilization chamber. 

It keeps the use of gas at a minimum while ensuring the highest possible concentration.

EOGas 4 Sterilizer


The load and the 17.6g EtO cartridge are placed in the sterilization bag.

Standard sterility indicators (BIs) are used to ensure cycle success.

EOGas 4 Sterilization Bag


The loaded sterilization bag is connected to the gas management system. This will extract most of the air from the bag while the sterilant is released. The opposite will happen once sterilization has been achieved. This process ensures a high gas concentration while minimizing the use of gas.


The sterilization bag and its components

Step by step operation of EOGas 4


These are the technical specifications of the EOGas Series 4 (AN-4000.11) sterilizer. Please contact us if you need more details.


External dimensions:

(L x H x D) 22 in x 28 in x 28.25 in


Internal dimensions:

(L x H x D) 19 in x 13.75 in x 23.25 in


Capacity: 3.6 cu ft


Cycle duration:

3.5 hours at 50 °C

12 hours at 30 °C

Total Weight: 168 lbs.

Power Supply:  240v+/-10%, 150W

Installation requires only a 240VAC outlet and a dedicated exhaust line to the outside.


Manufactured by:  Andersen Sterilizers, Inc.

Distributed by:  Steriflex Pty Ltd

EOGas4 Specifications

EOGas Accessories

EOGas 4 Refill kit  AN-1004.16

EOGas 4 Refill kit



The Series 4 refill kit comes with cartridges, liner bags, Humidichips and Dosimeters for 14 cycles. Each cartridge contains 17.6 g of EtO, and the liner bag (sterilization chamber) holds up to 45 l. The series 4 sterilizer requires this kit and only this kit.



15 x sterilization bags

14 x EtO cartridges

14 x Humidichips

14 x Dosimeters


Number of cycles 14

Sterilization bag size 45 l

EtO quantity in cartridge 17.6 g

AN-1087 Chemical Indicator - EOGas Dosimeter 25 per box

AN-1087 Chemical Indicator - EOGas Dosimeter 25 per box

Time, temperature and EO concentration are essential to successful sterilization.  Dosimeter integrators present visual assurance that all these parameters have been fulfilled.  Dosimeters change colour in proportion to the dose of sterilant they contact.  View results immediately after sterilization.  No laboratory culture is necessary.  Use one Dosimeter per cycle.  (Not a BI substitute).

  • Read results immediately

  • Reliable

  • Easy to use for every sterilization load               

AN-1071 Humidichip® RH Stabilizer

AN-1071 Humidichip® RH Stabilizer

Designed specifically for use with Andersen EOGas™ and Anprolene®, this unique device ensures adequate Relative Humidity (RH) during the sterilization cycle.  Every single-use pre-moistened 2" x 2" Humidichip releases up to 4 grams of water vapour.  Employ Humidchip® with a Humiditube™ in each sterilization cycle.

  • Ensures RH requirements for sterilization are met

  • Prevents wetness

AN-1072 Humiditube®

AN-1072 Humiditube®

The Humiditube™, developed to work with the Humidichip, allows air to circulate around the chip to help function properly.

AN-1000.97 Printer Labels - EOGas Sterilizers

AN-1000.97 Printer Labels - EOGas Sterilizers

Printer labels for the Series 4 EOGas sterilizers, 500 labels per roll. Designed to work with the Series 4 EOGas machines, labels allow you to track bags as you add and remove sterilization loads. 

Self Seal Pouches

Self Seal Pouches

Uncoated paper/propylene-polyester peel pouches printed with indicators for EO and Steam.

Remove protective backing and press closure strips for a quick and easy seal.

Provides superior bacterial barrier.

No heat sealing equipment required, super-convenient to use.


6.5″length x 3.5″width (165mm x 89mm)



10″ length x 3.5″ width (254mm x 89mm)


11″ length x 5.25″ width (280mm x135mm)


13″ length x 7.5″ width (330mm x 178mm)


OD: 15″ length x 12″ width (381mm x 305mm)

ID: 11 x 11 ¼” at the side and 11 x 12 ¾” at the chevron


  • How long does it take to sterilise an endoscope?
    Endoscopes are sterilised in a 3.5 hour cycle. The user must also allow manufacturer EtO aeration guidelines that could be up to additional 12 hours of aeration.
  • Do you need water or steam heat lines?
    No. Our tabletop unit only needs a 1 inch port to the outside.
  • Is it ARTG listed?
    Yes it is. Please see the ARTG clearance info here.
  • How many endoscopes can be sterilised at a time?
    Depends on endoscope type and size. Please see FDA validation information above.
  • Is it difficult to install?
    No. It is very easy and convenient to install and comes in a tabletop package.
  • Is EtO corosive on endoscopes?
    No. EtO is the most gentle type of sterilisation available. Perfect for your most delicate instruments.
  • Is training included in the price?
    Yes, we offer training free of charge for the life of steriliser.
  • Will EtO be banned?
    No. EtO is used in many different household products and has a similar chemical ratings as other products such as hydrogen peroxide.

Resources for existing EOGas 4 users





bottom of page