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Intersorb RG

Intersorb RG
Spherasorb® 408

Intersorb® RG Carbon Dioxide Absorbent — 4 to 8 mesh Indicating + Non-indicating soda lime

Intersorb® Subsea 408 NI (non-indicating)  |  Intersorb® Subsea 408 WV (indicating)

Intersorb RG Carbon Dioxide Absorbent is a refinery grade product which removes low levels of acid gases such as CO2 and Sulphur Compounds from liquid and mixed phase hydrocarbon streams and petrochemical products. Ideally used in a polishing step after caustic wash or similar bulk cleaning steps to remove impurities.

  • Particle size — 4-8 Mesh (3mm cylindrical granules)
  • Higher CO2 capacity and longer duration compared to standard soda lime formulations

Application | Use:

Rebreather, Recreation Rebreather Diving, Commercial Diving, Military, Mine Safety Equipment.


Intersorb® Subsea 408 is comprised of 3 mm cylindrical granules and has been developed specifically for use in saturation diving systems and other industrial applications where humidity levels can be significantly lower than in personal protection closed circuit applications. In these applications, Intersorb® Subsea shows a significant increase in CO2 absorption capacity compared with standard sodalime formulations.

Intersorb® Subsea has been tested to NATO test standard STANAG No 1411.

Chemical Composition

Intersurgical tests

Intersorb® 408 NI

Intersorb® 408 WV

Calcium Hydroxide:

Sodium Hydroxide:

Ethyl Violet:







Note: These figures represent the dry constituents. The product will additionally contain 19.5% to 22.5% water.

Physical Properties

NATO test standard STANAG No. 1411

Particle Size

Over 5.60 mm

4.74 to 5.60 mm

2.00 to 4.75 mm

0.600 to 2.00 mm

Under 0.600 mm

Bulk density kg/L

Moisture Content

Intersorb® 408 NI + WV






0.84 to 0.90

20.5% to 22.5%%


7% maximum

30% maximum


15% maximum

1% maximum

19.5% to 24.5%

Carbon Dioxide Absorption

EN14143 with ambient air

Intersorb® 408 NI + WV
typical data


(% retained on 2.5 mm screen)


75% minimum

Resistance to Flow
(40 L/m, absorber 10 cm diameter, 12.5 cm height, volume 1 Liter)

0.9 mbar unused
1.1 mbar used

CO2 Absorption NATO STANAG 1411

74 minutes

60 minutes minimum

3 litre absorber
20 x 2 liter breaths per minute.
Challenge gas = ambient air 45 % to 65 % RH and 20oC to 25oC containing 1.6 L/min CO2.
Atmospheric pressure

Additional Information

Transport + Disposal

Intersorb® Subsea 408 is available in 45 pound airtight kegs. Standard shipping applies. Dispose of in accordance with local, state, and federal regulations.

Storage + Handling:

Store in a dry, well ventilated area away from incompatible substances, such as strong acids. Avoid excessive temperatures. Keep container tightly sealed. Do not leave absorbent exposed to air for prolonged periods. Dust may cause irritation. Avoid breathing dust. Avoid contact with eyes. Wash hands and contact area after handling.


Irritating to eyes, respiratory system and skin (see handling above).


Dive Long will replace any material found to be defective, but accepts no liability through improper storage, handling or application of this product.


All data provided herein is based upon years of research, laboratory testing and actual product usage. Dive Long makes no representations or warranties of any kind concerning this information.