All Photos(2)



Cesium hydroxide solution

50 wt. % in H2O, 99.9% trace metals basis

Caesium hydroxide
Linear Formula:
CAS Number:
Molecular Weight:
MDL number:
PubChem Substance ID:

Quality Level


99.9% trace metals basis




50 wt. % in H2O


≤1000.0  ppm Trace Metal Analysis


1.72 g/mL at 25 °C

SMILES string




InChI key


Looking for similar products? Visit Product Comparison Guide


Cesium hydroxide solution is used to make porous cesium titanosilicates, potential ion-exchange materials for cleanup of radioactive wastes.CsOH impregnated in FAU zeolites enhanced their basic properties without affecting the FAU framework.It can effectively catalyse the condensation of methyl propionate with formaldehyde to yield methyl methacrylate.


10, 50, 200 g in poly bottle


CorrosionExclamation mark

Signal Word


Hazard Statements

Precautionary Statements

Hazard Classifications

Acute Tox. 4 Oral - Skin Corr. 1B

Storage Class Code

8A - Combustible, corrosive hazardous materials



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

  1. How does the storage temperature relate to shipping conditions?

    The storage conditions that a Sigma-Aldrich catalog and label recommend for products are deliberately conservative. For many products, long-term storage at low temperatures will increase the time during which they are expected to remain in specification and therefore are labeled accordingly. Where short-term storage, shipping time frame, or exposure to conditions other than those recommended for long-term storage will not affect product quality, Sigma-Aldrich will ship at ambient temperature. The products sensitive to short-term exposure to conditions other than their recommended long-term storage are shipped on wet or dry ice. Ambient temperature shipping helps to control shipping costs for our customers. At any time, our customers can request wet- or dry-ice shipment, but the special handling is at customer expense if our product history indicates that the product is stable for regular shipment. See Shipping and Storage for more information.

  2. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  3. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  4. How do I find price and availability?

    There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers.

  5. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  6. What is the molarity of Product 232041, Cesium hydroxide solution?

    The molar concentration of Product 232041, Cesium hydroxide solution, is 5.7 M, based on a w/w% concentration of 50%, a density of 1.72 g/mL and a MW of 149.91. (50 g CsOH/100 g solution) X (1720 g solution/L solution) /(149.91 g CsOH/mole) = 5.7 moles/L.

  7. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

Formation of methyl methacrylate by condensation of methyl propionate with formaldehyde over silica-supported cesium hydroxide catalysts
Ai M
Applied Catalysis A: General, 288(1-2), 211-215 (2005)
Behrens, E.A. et al.
Chemistry of Materials, 8, 1236-1236 (1996)
Enhancement of the basic properties in FAU zeolites by impregnation with cesium hydroxide
Romero MD, et al.
Microporous and Mesoporous Materials : The Official Journal of the International Zeolite Association, 81(1-3), 313-320 (2005)
Zn2+-induced changes in Cav2.3 channel function: An electrophysiological and modeling study.
Neumaier, et al.
The Journal of General Physiology, 152 (2021)
M M V Ramana et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 152, 165-171 (2015-07-25)
In the present work, isopropyl-6-amino-4-(3,5-bis(trifluoromethyl)phenyl)-5-cyano-2-methyl-4H-pyran-3-carboxylate (4H-pyran analog) has been synthesized by a three component reaction catalyzed by CsOH/γ-Al2O3 and characterized. The interaction of 4H-pyran analog with herring sperm DNA (hs DNA) under physiological conditions (phosphate buffer of pH 7.2) was...


Methods of Synthesizing Monodisperse Colloidal Quantum Dots

Colloidal quantum dots (CQDs) are semiconducting crystals of only a few nanometers (ca. 2–12 nm) coated with ligand/surfactant molecules to help prevent agglomeration.

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service