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Intersorb 812

Intersorb 812
Intersorb 812

Intersorb® 812 — 8 to 12 Mesh Indicating + Non-indicating Sodalime Grade D

Intersorb® 812 NI (non-indicating)  |  Intersorb® 812 WV (indicating)

Intersorb® 812 is a conventional soda lime Carbon Dioxide (CO2) absorbent comprised of short porous strands. Available as an 8-12 mesh particle size to maximize CO2 capacity, for those divers requiring a long dive duration. 

  • Particle size — 8-12 Mesh (1.5mm to 2.5mm)
  • 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® 812 is comprised of 2 mm cylindrical granules and has been produced to achieve the maximum carbon dioxide absorption and optimum physical properties. This is to achieve the most suitable performance within rebreathers.

Intersorb® 812 has been tested to NATO test standard STANAG No 1411.

Chemical Composition

Intersurgical tests

Intersorb® 812 NI

Intersorb® 812 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® 812 NI + WV








1% maximum

30% maximum


20% maximum

1% maximum

14% to 20%

Carbon Dioxide Absorption

NATO test standard STANAG No. 1411

Intersorb® 812 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® 812 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.