If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
12665
Potassium (poly)sulfide
≥42% K2S basis
Synonym(s):
Potassium polysulfide
Select a Size
| Size/SKU | Availability | Price |
|---|---|---|
100 g | Available to ship TODAYfromMILWAUKEE | $47.30 |
1 kg | Available to ship TODAYfromMILWAUKEE | $317.00 |
6 x 1 kg | Available to ship TODAYfromMILWAUKEE | $1,070.00 |
20 kg | Check Cart for Availability | $2,700.00 |
About This Item
$47.30
Available to ship TODAYDetails
Quality Segment
form
solid
concentration
≥42% (K2S)
SMILES string
[K+].S
InChI
1S/K.H2S/h;1H2/q+1;
InChI key
ZOCLAPYLSUCOGI-UHFFFAOYSA-N
Application
1 of 1
This Item | |||
|---|---|---|---|
| form solid | form solid | form solid | form solid |
| Quality Level 100 | Quality Level 100 | Quality Level 100 | Quality Level 200 |
| concentration ≥42% (K2S) | concentration - | concentration ≥51.2% (with KMnO4, titration) | concentration - |
signalword
Danger
hcodes
Hazard Classifications
Aquatic Acute 1 - Eye Dam. 1 - Self-heat. 2 - Skin Corr. 1B - STOT SE 3
target_organs
Respiratory system
supp_hazards
Storage Class
4.2 - Pyrophoric and self-heating hazardous materials
wgk
WGK 2
flash_point_f
Not applicable
flash_point_c
Not applicable
ppe
Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges
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How can I determine the shelf life / expiration / retest date of this product?
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How do I interpret the :"≥42% K2S basis" purity? Is the remaining 58% an unknown distribution of polysulfides and sulfur or is there also an unknown quantity of water?
1 answer-
The purity statement of "≥42% K2S basis" indicates that at least 42% of this product is potassium sulfide (K2S). The remaining 58% primarily consists of polysulfides and sulfur, with a smaller amount of water present. Thus, the majority of the remaining composition is likely polysulfides and sulfur, while water constitutes a minority portion.
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How is shipping temperature determined? And how is it related to the product storage temperature?
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Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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My laboratory has bought this Potassium (poly)sulfide to form an electrolite to be used in nanoparticle based solar cells. I can’t find a way to make such a solution in papers. Previously this solution had been done with 0.5M Na2S and 0.1M S.
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Unfortunately, the solubility of this product is not tested. There are some references papers regarding the preparation of potassium (poly)sulfide electrolyte for batteries that may be helpful:
https://www.nature.com/articles/s41467-024-45405-w
https://www.nature.com/articles/s41560-023-01370-0Helpful?
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