Expired but unused/sealed sorb: what actually happens to make it unusable?

E-man · 24th December 2006, 04:27

Most of the rating is most likely simply life rating for the container of the sorb. Also as previously stated storing in an inadequate environment can cause the water content of the sorb to change and not return to its previous state. Imagine a hot environment where all of the water forms water vapor which eventually condenses onto the wallls of the container, which inturn runs down onto the top layer of the sorb which soaks it up which leaves your top portion of sorb with too much water and the rest with too little. ?

IMO

OxyCheq · 24th December 2006, 05:29

The only thing I have ever seen regarding storage related to temperture is freezing the rocks can diminish the performance. I have never seen or heard anything about heat impacting it.

Best regards,

Patrick
----
OxyCheq
OxyCheq ... oxygen analyzers and oxygen sensors

Quote: (Originally Posted by E-man)

Most of the rating is most likely simply life rating for the container of the sorb. Also as previously stated storing in an inadequate environment can cause the water content of the sorb to change and not return to its previous state. Imagine a hot environment where all of the water forms water vapor which eventually condenses onto the wallls of the container, which inturn runs down onto the top layer of the sorb which soaks it up which leaves your top portion of sorb with too much water and the rest with too little. ?

IMO

webslave · 28th February 2007, 21:48

Some advice can be found here
Sodasorb - Steam Machines, Inc.
Hope it helps:-)

"Storage & Handling: Store Sodasorb absorbent in an airtight container in a clean, cool and dry environment. Extremes of temperature should be avoided as they may lead to a reduction in efficiency for any absorbent material. High temperatures may evaporate the moisture content of the absorbent. Allowing the material to freeze will cause the moisture content to expand and fragment the granules causing excessive dust. Indicator treated absorbents should also be stored away from intense light, especially ultra-violet light as this degrades the indicator dye."

dave-diving · 1st March 2007, 08:46

I used to buy quite a bit off Molecular Products in the 90's (MP United now) before AP were buying for diving and their strategy was simple but I suspect might be costly unless dealing with the odd pallet load. Our regen used to eat the stuff on research dives but we still asked the question back then.

If, after the five year period, we ever needed to have the product re-dated for our stock we could send it back to them for analysis and re-sealing. Happy to say we never needed to avail ourselves of their genuine offer.

If stored and seal not broken they would re-date with very little problem. It was only £31.00 per 22kg to buy then.

Tom, speaking of UT240...have you heard from Stuart Clough at all recently. Lost touch.

Regards,
Dave

Gene_Hobbs · 12th March 2007, 01:34

Quote: (Originally Posted by webslave)

"...Indicator treated absorbents should also be stored away from intense light, especially ultra-violet light as this degrades the indicator dye."

Chemical safety of U.S. Navy Fleet soda lime.
Lillo et. al. 1996
RRR ID: 2238, PubMed ID: 8653065

"...The source(s) of the ammonia and amines are unknown, although they may result from the breakdown of the indicator dye. Hydrocarbon contamination seems to result from the materials of which the bucket is constructed. Unfortunately, evaluation of potential hazards associated with this contamination is difficult, due in part to the large number of variables of operational use and the absence of appropriate exposure limits. Based on these findings, the U.S. Navy has begun to phase in, for all diving, non-indicating soda lime that will be required to meet defined contaminant limits."

24th December 2006, 04:27	#11 (permalink)
E-man On the loop! Current Rebreather/s: Inspiration Classic Optima Other Rebreather/s: Titan Join Date: Sep 2005 Location: Eastern Coast ;) Posts: 212	Re: Expired but unused/sealed sorb: what actually happens to make it unusable? Most of the rating is most likely simply life rating for the container of the sorb. Also as previously stated storing in an inadequate environment can cause the water content of the sorb to change and not return to its previous state. Imagine a hot environment where all of the water forms water vapor which eventually condenses onto the wallls of the container, which inturn runs down onto the top layer of the sorb which soaks it up which leaves your top portion of sorb with too much water and the rest with too little. ? IMO
(Offline)

24th December 2006, 05:29	#12 (permalink)
OxyCheq New Member Current Rebreather/s: Inspiration Classic Sport Kiss MK 15.X Other CCR Dolphin Other Rebreather/s: Other CCR Dolphin Join Date: Jan 2006 Location: Marianna FL USA Posts: 17	Re: Expired but unused/sealed sorb: what actually happens to make it unusable? The only thing I have ever seen regarding storage related to temperture is freezing the rocks can diminish the performance. I have never seen or heard anything about heat impacting it. Best regards, Patrick ---- OxyCheq OxyCheq ... oxygen analyzers and oxygen sensors Quote: (Originally Posted by E-man) Most of the rating is most likely simply life rating for the container of the sorb. Also as previously stated storing in an inadequate environment can cause the water content of the sorb to change and not return to its previous state. Imagine a hot environment where all of the water forms water vapor which eventually condenses onto the wallls of the container, which inturn runs down onto the top layer of the sorb which soaks it up which leaves your top portion of sorb with too much water and the rest with too little. ? IMO __________________ OxyCheq ... the diver's source for analytical instruments, wings and other tech diving equipment "Just because someone takes a dump once a day does not qualify them as a proctologist." P. Duffy
(Offline)

28th February 2007, 21:48	#13 (permalink)
webslave New Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Confusion Posts: 14	Re: Expired but unused/sealed sorb: what actually happens to make it unusable? Some advice can be found here Sodasorb - Steam Machines, Inc. Hope it helps:-) "Storage & Handling: Store Sodasorb absorbent in an airtight container in a clean, cool and dry environment. Extremes of temperature should be avoided as they may lead to a reduction in efficiency for any absorbent material. High temperatures may evaporate the moisture content of the absorbent. Allowing the material to freeze will cause the moisture content to expand and fragment the granules causing excessive dust. Indicator treated absorbents should also be stored away from intense light, especially ultra-violet light as this degrades the indicator dye."
(Offline)

1st March 2007, 08:46	#14 (permalink)
dave-diving Human Fuktup Engineering Current Rebreather/s: Megalodon Other CCR Dolphin Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Sport Kiss Classic Kiss MK 15.X Optima Other CCR Dolphin Join Date: May 2005 Location: Britain....Cornwall Posts: 20	Re: Expired but unused/sealed sorb: what actually happens to make it unusable? I used to buy quite a bit off Molecular Products in the 90's (MP United now) before AP were buying for diving and their strategy was simple but I suspect might be costly unless dealing with the odd pallet load. Our regen used to eat the stuff on research dives but we still asked the question back then. If, after the five year period, we ever needed to have the product re-dated for our stock we could send it back to them for analysis and re-sealing. Happy to say we never needed to avail ourselves of their genuine offer. If stored and seal not broken they would re-date with very little problem. It was only £31.00 per 22kg to buy then. Tom, speaking of UT240...have you heard from Stuart Clough at all recently. Lost touch. Regards, Dave __________________ "Never argue with an idiot. They drag you down to their level, then beat you with experience."
(Offline)

12th March 2007, 01:34	#15 (permalink)
Gene_Hobbs Custom Title Allowed! Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Sep 2006 Location: Durham, NC, USA Posts: 117	indicator dye Quote: (Originally Posted by webslave) "...Indicator treated absorbents should also be stored away from intense light, especially ultra-violet light as this degrades the indicator dye." Chemical safety of U.S. Navy Fleet soda lime. Lillo et. al. 1996 RRR ID: 2238, PubMed ID: 8653065 "...The source(s) of the ammonia and amines are unknown, although they may result from the breakdown of the indicator dye. Hydrocarbon contamination seems to result from the materials of which the bucket is constructed. Unfortunately, evaluation of potential hazards associated with this contamination is difficult, due in part to the large number of variables of operational use and the absence of appropriate exposure limits. Based on these findings, the U.S. Navy has begun to phase in, for all diving, non-indicating soda lime that will be required to meet defined contaminant limits." __________________ http://rubicon-foundation.org/ Home of the Rubicon Research Repository. For help getting started with the Repository, please visit our FAQ page. PLEASE support our work. "Oxygen is addictive and deadly. Everyone who uses it will eventually die" --RW Hamilton, PhD 1991 Last edited by Gene_Hobbs : 12th March 2007 at 01:35. Reason: add link to Pubmed
(Offline)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode