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Intersorb 408

Intersorb 408
Intersorb 408

Intersorb® 408 — 4 to 8 Mesh Indicating + Non-indicating Sodalime Grade D

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

Intersorb® 408 is a conventional soda lime Carbon Dioxide (CO2) absorbent comprised of short porous strands. Available as an 4-8 mesh particle size to maximize CO2 capacity, for those divers requiring a long dive duration.

  • Particle size — 4-8 Mesh (2.5mm to 5.0mm)
  • Higher CO2 capacity and longer duration compared to larger particle size products

Application | Use:

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


Intersorb® 408 is comprised of 3 mm cylindrical granules. It 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® shows a significant increase in CO2 absorption capacity, compared with standard soda lime formulations.

Intersorb® 408 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 14% to 18% water.

Physical Properties

NATO test standard STANAG No. 1411

Particle Size

Over 2.80 mm

2.00 to 2.80 mm

1.40 to 2.00 mm

0.600 to 1.40 mm

Under 0.600 mm

Moisture Content

Intersorb® 408 NI + WV








1% maximum

30% maximum


20% maximum

1% maximum

14% to 20%

Carbon Dioxide Absorption

NATO test standard STANAG No. 1411

Intersorb® 408 NI + WV
typical data


(% retained on 1.4 mm screen)


80% minimum

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

1.4 mbar unused
1.6 mbar used

Time to 0.5% CO2
Breakthrough (minutes)

100 minutes

80 minutes

CO2 Capacity L/kg

150 L/kg

120 L/kg minimum

105 ml absorbent in 30 mm diameter tube.
Challenge gas: 3.0 L/min air containing 5% CO2.
Humidity 100 %
Temperature 20°C

Additional Information

Transport + Disposal

Intersorb® 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.