Oxygen absorbers ATCO, ZerO2 and RP

Typical applications:

  • 1. Anoxic disinfestations:
    At oxygen levels of <0,3% all insects at any stage of development are killed within several weeks (ap. 4 weeks at 23°C, 2 weeks at 25°C and 55% RH). Objects to be treated are hermetically sealed in oxygen barrier film along with a proper amount of oxygen absorbers.
  • 2. Conservation of metals: Corrosion of metals is practically halted, even in humid and salt infested conditons, as it is the case with fresh archaeological finds which must not be dried. Anoxic enviroment protects organic remains from bio-degradation. So conditions inside the bag are quite similar to conditions inside the ground.
    With RP-A, fresh metal surfaces and electronic parts can be maintained free from corrosion for many years.
  • 3. Conservation of products sensitive to oxygen (food, rubber, plastics, greases...)
    ATCO FT oxygen scavengers are all safe for contact with food (ATCO FTM1000 only for non-food application!). These scavengers are being used in large quantities for the conservation of cereals, cookies etc.).
    In museums it is used for example for the conservation of rubber, which by no other means can be stored effectively over long periods. Many plastics also profit from low-oxygen atmospheres. Benefit to textiles, paper or film materials however is relatively small: other degradation mechanisms like hydrolysis are far more important.

nach obenATCO FTM


ATCO oxygen absorber reduce oxygen concentration within a sealed container down to 0,01%, creating a very low-oxygen environment. Large enclosures like anoxic bubbles can be flushed with nitrogen before introducing the oxygen scavenger (see our product line anoxic disinfestations).

ATCO sachets contain fine iron powder covered with sea salt impregnated with a NaCl-solution. One sachet of ATCO FTM 1000 absorbs 1000 ml oxygen (the oxygen from 5 l air) and releases about 0,4 g of water during use. With no humidity buffer involved, ATCO creates a relative humidity of 68% RH. The release of moisture can be balanced by either 25 g pre-conditioned PRO SORB or one 5 g bag dry silica gel per sachet of Ageless FTM1000 (values deduced from Elert 2003). For anoxic bubbles you also might use cardboard to buffer humidity fluctuations during the treatment, for example by surrounding the objects with corrugated cardboard.

ATCO FTM 1000 contain iron wih specially low sulphur content. It has been demonstrated that the normal types of ATCO and Ageless release sulphurous gases, tarnishing silver and other metals.

ATCO should be stored at temperatures < 25°C.

Calculation of quantity:

Oxygen absorption is reducing the volume of the bag by one fifth. Therefore bags or bubbles must always be prepared 20% larger, to make sure the decrease in volume won't damage the enclosure or the content.


Oxy-eye and Ageless-eye  are oxygen indicators  turning pink below 0,1% oxygen and returning to blue above 0,5% oxygen. Ageless-eye should be stored in a refrigerator in a sachet containing an oxygen absorber. After more than one year of storage, the colour shift is not reliable any more. 
The colour shift is only reversible a maximum of 3 - 4 times. We recommend to use them only once!

We don't recommend these indicators for large bubbles, since they tend to be inaccurate when anoxic conditions are only reached after some days.

More accurate measuring requires oxygen meters, the most versatile being GMH 3692 GOG-L.


ATCO FT 100 and ATCO FT 210 (Replacing for the scavenger Ageless ZPT 100 and Ageless ZPT 300 which are no longer available)
ATCO FT 100, approx. 40 x 50 mm
200 sachets 23,- €

one sachet is sufficient for 0,5 l air volume

400 sachets 41,- €
1000 sachets 100,- €
(1 box) 3000 sachets 292,- €
ATCO FT 210 , approx. 50 x 50 mm
200 sachets 32,- €

one sachet is sufficient for 1,05 l air volume

400 sachets 59,- €
1000 sachets 141,- €
(1 box) 2000 sachets 269,- €
 ATCO FTM 1000, ca. 80 x 80 x 12 mm, 30 g
50 sachets 18,- €
one sachet is sufficient for 5 l air volume

only for non-food application

200 sachets 67,- €
(1 box) 500 sachets 124,- €
2000 sachets 485,- €
5000 sachets 1170,- €


ATCO were developed for food industry. They are non-poisonous and can be discarded after use as normal waste. The heat of the reaction elevates the temperature within the sachets up to around 42°C, so sensitive art objects should not be in direct contact with the oxygen scavenger.

nach obenOxygen absorber ZerO2


 ZerO2 (500g) for approx. 0,5 m³ air volume

one piece of green-yellow PE bag (incl. 3 yellow non-woven bags) is sufficient for 500 l air volume

To compensate the moisture release we recommend to add 2 desiccant bags DESI Pak 30g (1 unit) per 1 sachet ZerO2

1 pcs. 24,- €
10 pcs. 220,- €
20 pcs. 420,- €
100 pcs. 1900,- €


  • The oxygen absorber ZerO2 becomes warm (maximum surface temperatur 48°C) during the initial stages (12 hours) of treatment. Care should be taken to avoid direct contact with sensitive materials such as waxes, oil based paints and silks. Once the oxygen has been removed during the treatment, the reactions stops and the packs become cold.
  • A small amount of moisture is generated in the oxygen-depletion process. The relative humidity within the bubble normally settles at approx. 68% RH at 25°C. When treating very delicate items or where there is a specific need for a lower relative humidity, we recommend adding desiccant bags DESI Pak 30g / 1 unit ( 2 pcs. per 0,5 m (= 500 l)).

nach oben Oxygen indicators

Oxygen indicator Oxy-eye, self-adhesive, dimensions: approx. 35 x 23 mm. Packed by 5
1 x 5 pcs. 4,00 €

Colour transition from blue to pink at an oxygen concentration less than 0,1%.
Ambient conditions: +2°C...+40°C / 30%...95% RH
Please store in the fridge!

2 x 5 pcs. 7,60 €
5 x 5 pcs. 17,50 €
20 x 5 pcs. 63,00 €
50 x 5 pcs. 150,00 €


Indicator tablets Ageless-eye : (can be kept in a refrigerator for about 6 month, so don’t buy too many at a time): ap. 26 x 43 mm
5 tablets 5,- €

Original packing is 25 tablets.
The smaller packges have been re-packed.

We recommend Ageless-eye for long term applications like anoxic storage.

10 tablets 10,- €
25 tablets 20,- €
100 tablets 70,- €
1.000 tablets 650,- €


nach obenOxygen absorber RP-K: absorbs oxygen without influencing RH

Oxygen scavenger RP-K is also active under dry conditions and is absorbing oxygen without influencing relative humidity.

Furthermore it contains some active charcoal for the  adsorption of pollutants like SO2, HCl or NH3.  RP-K consists of unsaturated organic compounds and some inorganic sorbents like graphite and Ca(OH)2 as well as polythene.

RP-3K, for 300 ml air volume, size: 35 x 120 mm
25 sachets: 32,- € 100 sachets: 120,- € 1000 sachets: 1.150,- € 10 000 sachets: 11.370,- € order
RP-20K, for 2000 ml air volume, size: 100 x 130 mm
10 sachets: 80,- € 50 sachets: 390,- € 200 sachets: 1.500,- € 1000 sachets: 7.200,- € order

nach obenOxygen absorber RP-A: absorbs oxygen and dries at the same time (for metals, electronic components ...)

Oxygen absorber RP-A is containing similar materials but also a very strong sorbent for humidity (zeolith), reducing relative humidity within the container to almost 0 % RH. One sachet of RP-5A absorbs around 1,1 g of water. RP-A fights against metal corrosion on three levels, reducing simultaneously oxygen, humidity and pollutants. However, for most metal objects in museums, dry storage with desiccants like silica gel or bags of molecular sieves will be sufficient to prevent corrosion.

RP-1A, for 100 ml air volume
25 sachets: 14,- € 100 sachets: 51,- € 1000 sachets: 490,- € 10 000 sachets: 4.700,- € order
RP-3A, for 300 ml air volume, size: 35 x 120 mm
25 sachets: 26,- € 100 sachets: 99,- € 1000 sachets: 910,- € 10 000 sachets: 8.800,- € order
RP-5A, for 500 ml air volume, size: 51 x 120 mm
25 sachets: 37,- € 100 sachets: 145,- € 1000 sachets: 1.350,- € 10 000 sachets: 13.200,- € order


For low-oygen storage or anoxic treatments, only sufficiently oxygen-tight containers can be used. A simple solution can be a twist-off jam pot or a preserving jar, but in most cases bags made of high-barrier films are used, like aluminium-laminates or ESCAL-film or. Oxygen permeability of the transparent ESCAL-film is as low almost as low as aluminium film. Seals should be around 8 mm large and absolutely perfect. Only the best sealing instruments will do for this purpose. We recommend Joke SZ 380-8 (photo) . You also can use the Polystar 300D which is a versatile sealer but its seals are only 3 mm wide. For long-term uses you can place 2 - 3 seals next to each other. . Do some tests before you proceed to seal your bags. For example, if you seal an aluminium laminate and try to tear the two sheets apart, the seal should break along the aluminium layer and not between the PE-layers.

For smaller items or medium-term applications, pre-sealed bags are available which can be closed by special clips


Also see:

Terms of sales and delivery

Products on stock are usually sent out within one week. Nevertheless, please order as early as possible. Transport is normally by FedEx Economy (±2-3 days within Europe), carriage is charged according to weight, dimensions and number of parcels.
All prices are exclusive VAT. Payments can be made within 30 days by bank transfer, within 14 days with 3% discount. All prices are subject to change without prior notice according to our terms and conditions. Check our website for actual information.

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