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
757551
Potassium hydroxide
≥99.95% trace metals basis
Synonym(s):
Caustic potash
About This Item
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InChI
1S/K.H2O/h;1H2/q+1;/p-1
InChI key
KWYUFKZDYYNOTN-UHFFFAOYSA-M
grade
anhydrous
vapor pressure
1 mmHg ( 719 °C)
assay
≥99.95% trace metals basis
form
crystals or chunks, powder and chunks, powder or crystals
reaction suitability
core: potassium
impurities
≤500.0 ppm Trace Metal Analysis
mp
361 °C (lit.)
solubility
H2O: soluble 1120 g/L
anion traces
(Boron (B)≤ 0.1 ppm)
cation traces
Ag: ≤0.1 ppm, Al: ≤0.4 ppm, Ba: ≤1.0 ppm, Ca: ≤1.9 ppm, Cr: ≤0.3 ppm, Cu: ≤0.5 ppm, Fe: ≤0.7 ppm, Mg: ≤0.4 ppm
Quality Level
SMILES string
[OH-].[K+]
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This Item | |||
|---|---|---|---|
| form crystals or chunks, powder or crystals, powder and chunks | form powder | form pellets | form pellets |
| solubility H2O: soluble 1120 g/L | solubility - | solubility H2O: 1 M, clear, colorless | solubility - |
| assay ≥99.95% trace metals basis | assay ≥85% | assay ≥85% KOH basis | assay ≥85% KOH basis |
| Quality Level 100 | Quality Level 200 | Quality Level 200 | Quality Level 200 |
| grade anhydrous | grade - | grade - | grade - |
| impurities ≤500.0 ppm Trace Metal Analysis | impurities ≤0.002% heavy metals (as Pb), ≤1.0% K2CO3 | impurities ≤0.0005% Phosphorus (P), ≤0.1% Insoluble matter, ≤2.0% K2CO3 | impurities ≤2.0% K2CO3 |
General description
Application
- Biodiesel Production from Waste Cooking Oil: Describes the use of potassium hydroxide in biodiesel production, emphasizing its effectiveness in catalyzing the transesterification of waste cooking oil (K Komaladevi, R Pandithurai, 2023).
- Chemical Activation for Dye Adsorption: Utilizes potassium hydroxide in the activation process to enhance the adsorption capacity of hemp-based activated carbon, crucial for environmental cleanup and management (Y Toptaş, B Yavuz, A Aksoğan Korkmaz, et al., 2024).
- Surface Modification of Raphia Fibres: Highlights the use of potassium hydroxide for the chemical modification of Raphia fibres to improve their mechanical properties and water absorption, relevant in textile and material engineering (I Omemereyore, OT Uzoma, et al., 2024).
- High-Performance Supercapacitors: Discusses the role of potassium hydroxide in enhancing the charge storage performance of electrodes, critical for the development of advanced energy storage systems (Y Pei, Z Ren, X Wu, et al., 2024).
signalword
Danger
hcodes
Hazard Classifications
Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1A
Storage Class
8A - Combustible corrosive hazardous materials
wgk
WGK 1
flash_point_f
Not applicable
flash_point_c
Not applicable
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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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