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Spherasob 408

Spherasob 408
Spherasob 408

Spherasorb® 408 — 4 to 8 Mesh Indicating + Non-indicating Soda Lime

Spherasrob® 408 NI (non-indicating)  |  Spherasorb® 408 WV (indicating)

Spherasorb® 408 is a spherical shaped Soda Lime, available as NI (non-indicating) or WV (indicating). Soda Lime’s efficiency at removing Carbon Dioxide from air, leaving Oxygen behind, makes it a vital part of CO2 Scrubbers and rebreathing systems.

  • Particle size — 4-8 Mesh (2.5mm to 5.0mm)
  • Uniform shape and particle size leads to low breather resistance and uniform packaging
  • Exceptionally low dust levels compared with conventional soda lime products

Application | Use:

Military, Diving, and Medical applications (Conditions where keeping air breathable when circulation with outside air is impossible.)


Spherasorb® 408 is comprised of 3 mm cylindrical granules, produced to achieve maximum CO2 absorption. The combination of the spherical shape and particle size (4 to 8 mesh) leads to good packing within scrubbers and rebreathers, generating very low dust levels and relatively low breathing resistance.

Spherasorb® 408 has been tested and conforms to the STANAG 1411 and EN14143 standards for rebreathers.

Chemical Composition

Intersurgical tests

Spherasorb® 408 NI

Spherasorb® 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 5.60 mm

4.75 to 5.60 mm

2.00 to 4.75 mm

0.600 to 2.00 mm

Under 0.600 mm

Moisture Content

Spherasorb® 408 NI + WV








1% maximum

7% maximum


15% maximum

1% maximum

14% to 18%

Carbon Dioxide Absorption

NATO test standard STANAG No. 1411

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)

0.8 mbar unused
1.0 mbar used

Time to 0.5% CO2
Breakthrough (minutes)

73 minutes

60 minutes

CO2 Capacity L/kg

128 L/kg

100 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

Spherasorb® 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.