Cesium Formate Solution

CAS #:

Linear Formula:


MDL Number:


EC No.:



(2N) 99% Cesium Formate Solution
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(3N) 99.9% Cesium Formate Solution
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(4N) 99.99% Cesium Formate Solution
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(5N) 99.999% Cesium Formate Solution
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Cesium Formate Solution Properties (Theoretical)

Compound Formula CHCsO2
Molecular Weight 177.92
Appearance Colorless liquid
Melting Point N/A
Boiling Point 112-145 °C
Density 1.7-2.4 g/cm3
Solubility in H2O N/A
Exact Mass 177.903106
Monoisotopic Mass 177.903106

Cesium Formate Solution Health & Safety Information

Signal Word Warning
Hazard Statements H302-H319-H371-H373
Hazard Codes Xi
Risk Codes 36/37/38
Safety Statements 26-36/37/39
RTECS Number N/A
Transport Information NONH for all modes of transport
WGK Germany 3
GHS Pictograms

View and Print SDS


Date Accessed: 07/25/2024
Date Revised:01/15/2022


Product Name: Cesium Formate Solution

Product Number: All applicable American Elements product codes, e.g. CS-FMAT-02-SOL , CS-FMAT-03-SOL , CS-FMAT-04-SOL , CS-FMAT-05-SOL

CAS #: 3495-36-1

Relevant identified uses of the substance: Scientific research and development

Supplier details:
American Elements
10884 Weyburn Ave.
Los Angeles, CA 90024
Tel: +1 310-208-0551
Fax: +1 310-208-0351

Emergency telephone number:
Domestic, North America: +1 800-424-9300
International: +1 703-527-3887


Classification of the substance or mixture
GHS Classification in accordance with 29 CFR 1910 (OSHA HCS)
Acute toxicity, Oral (Category 4), H302
Eye irritation (Category 2A), H319
Specific target organ toxicity - single exposure, Oral (Category 2), Nervous system, H371
Specific target organ toxicity - repeated exposure, Oral (Category 2), Nervous system, Blood, H373
GHS Label elements, including precautionary statements

Exclamation Mark - GHS07 Health Hazard - GHS08

Signal word Warning
Hazard statement(s)
H302 Harmful if swallowed.
H319 Causes serious eye irritation.
H371 May cause damage to organs if swallowed.
H373 May cause damage to organs through
prolonged or repeated exposure if swallowed.
Precautionary statement(s)
P260 Do not breathe dust/ fume/ gas/ mist/ vapours/ spray.
P264 Wash skin thoroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P280 Wear protective gloves/ eye protection/ face protection.
P301 + P312 IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell.
P305 + P351 + P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove
contact lenses, if present and easy to do. Continue rinsing.
P309 + P311 IF exposed or if you feel unwell: Call a POISON CENTER or doctor/
P314 Get medical advice/ attention if you feel unwell.
P330 Rinse mouth.
P337 + P313 If eye irritation persists: Get medical advice/ attention.
P405 Store locked up.
P501 Dispose of contents/ container to an approved waste disposal plant.
Hazards not otherwise classified (HNOC) or not covered by GHS - none


Synonyms : Formic acid cesium salt
Formula : CHCsO2
Molecular weight : 177.92 g/mol
CAS-No. : 3495-36-1
EC-No. : 222-492-8
Cas-No. 7732-18-5


Description of first aid measures
General advice
Consult a physician. Show this safety data sheet to the doctor in attendance.Move out of dangerous area.
If inhaled
If breathed in, move person into fresh air. If not breathing, give artificial respiration. Consult a physician.
In case of skin contact
Wash off with soap and plenty of water. Consult a physician.
In case of eye contact
Rinse thoroughly with plenty of water for at least 15 minutes and consult a physician.
If swallowed
Never give anything by mouth to an unconscious person. Rinse mouth with water. Consult a physician.
Most important symptoms and effects, both acute and delayed
The most important known symptoms and effects are described in the labelling (see section 2) and/or in section 11
Indication of any immediate medical attention and special treatment needed
No data available


Extinguishing media
Suitable extinguishing media
Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.
Special hazards arising from the substance or mixture
Carbon oxides, Cesium/cesium oxides
Advice for firefighters
Wear self-contained breathing apparatus for firefighting if necessary.
Further information
No data available


Personal precautions, protective equipment and emergency procedures
Use personal protective equipment. Avoid dust formation. Avoid breathing vapours, mist or gas. Ensure adequate ventilation. Evacuate personnel to safe areas. Avoid breathing dust.
For personal protection see section 8.
Environmental precautions
Prevent further leakage or spillage if safe to do so. Do not let product enter drains.
Methods and materials for containment and cleaning up
Pick up and arrange disposal without creating dust. Sweep up and shovel. Keep in suitable, closed containers for disposal.
Reference to other sections
For disposal see section 13.


Precautions for safe handling
Avoid contact with skin and eyes. Avoid formation of dust and aerosols.Further processing of solid materials may result in the formation of combu formation should be taken into consideration before additional processing
Provide appropriate exhaust ventilation at places where dust is formed.
For precautions see section 2.
Conditions for safe storage, including any incompatibilities
Keep container tightly closed in a dry and well-ventilated place.
Specific end use(s)
Apart from the uses mentioned in section 1 no other specific uses are stipulated


Control parameters
Components with workplace control parameters
Contains no substances with occupational exposure limit values.
Exposure controls
Appropriate engineering controls
Handle in accordance with good industrial hygiene and safety practice. Wash hands before breaks and at the end of workday.
Personal protective equipment
Eye/face protection
Safety glasses with side-shields conforming to EN166 Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).
Skin protection
Handle with gloves. Gloves must be inspected prior to use. Use proper glove removal technique (without touching glove's outer surface) to avoid skin contact with this product. Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. Wash and dry hands.
Body Protection
Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.
Respiratory protection
For nuisance exposures use type P95 (US) or type P1 (EU EN 143) particle r (US) or type ABEK-P2 (EU EN 143) respirator cartridges. Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).
Control of environmental exposure
Prevent further leakage or spillage if safe to do so. Do not let product enter drains.


on basic physical and chemical properties
Appearance Form: Solution
Odour No data available
Odour Threshold No data available
pH No data available
Melting point/freezing point
No data available
Initial boiling point and boiling range
No data available
Flash point ()No data available
Evaporation rate No data available
Flammability (solid, gas) The product is not flammable. - Flammability (solids)
Upper/lower flammability or explosive limits
No data available
Vapour pressure No data available
Vapour density No data available
Relative density No data available
Auto-ignition temperature
No data available
Decomposition temperature
No data available
Viscosity No data available
Explosive properties No data available
Oxidizing properties No data available
Other safety information
No data available


No data available
Chemical stability
Stable under recommended storage conditions.
Possibility of hazardous reactions
No data available
Conditions to avoid
No data available
Incompatible materials
Strong oxidizing agents, Alkali metals, Sulfuric acid, Halogens
Hazardous decomposition products
Hazardous decomposition products formed under fire conditions. - Carbon oxides, Cesium/cesium oxides
Other decomposition products - No data available
In the event of fire: see section 5


Information on toxicological effects
Acute toxicity
LD50 Oral - Rat - male and female - 1,780 mg/kg(Cesium formate)
(OECD Test Guideline 401)
Remarks: Behavioral:Ataxia.
LD50 Dermal - Rat - male and female - > 2,000 mg/kg(Cesium formate)
(OECD Test Guideline 402)
No data available(Cesium formate)
Skin corrosion/irritation
Skin - Rabbit(Cesium formate)
Result: Mild skin irritation - 4 h
(OECD Test Guideline 404)
Serious eye damage/eye irritation
Eyes - Rabbit(Cesium formate)
Result: Irritating to eyes.
(OECD Test Guideline 405)
Respiratory or skin sensitisation
in vivo assay - Mouse(Cesium formate)
Result: Does not cause skin sensitisation.
(OECD Test Guideline 429)
Germ cell mutagenicity
Ames test(Cesium formate)
S. typhimurium
Result: negative
IARC: No component of this product present at levels greater than or equal to 0.1% is identified as
probable, possible or confirmed human carcinogen by IARC.
ACGIH: No component of this product present at levels greater than or equal to 0.1% is identified as a carcinogen or potential carcinogen by ACGIH.
NTP: No component of this product present at levels greater than or equal to 0.1% is identified as a
known or anticipated carcinogen by NTP.
OSHA: No component of this product present at levels greater than or equal to 0.1% is identified as a carcinogen or potential carcinogen by OSHA.
Reproductive toxicity
No data available(Cesium formate)
No data available(Cesium formate)
Specific target organ toxicity - single exposure
Oral - May cause damage to organs. - Nervous system(Cesium formate)
Specific target organ toxicity - repeated exposure
Oral - May cause damage to organs through prolonged or repeated exposure. - Nervous system, Blood
Aspiration hazard
No data available(Cesium formate)
Additional Information
Repeated dose toxicity - Rat - male and female - Oral - No observed adverse effect level - 15 mg/kg(Cesium formate)
RTECS: Not available
To the best of our knowledge, the chemical, physical, and toxicological properties have not been thoroughly investigated.(Cesium formate)


Toxicity to fish semi-static test LC50 - Oncorhynchus mykiss (rainbow trout) - ca. 2,100 mg/l -
96 h(Cesium formate)
(OECD Test Guideline 203)
Toxicity to daphnia and
other aquatic invertebrates
static test EC50 - Daphnia magna (Water flea) - > 100 mg/l - 48 h(Cesium
(Directive 67/548/EEC, Annex V, C.2.)
Toxicity to algae static test EC50 - Pseudokirchneriella subcapitata (algae) - 110 mg/l - 72h(Cesium formate)
(OECD Test Guideline 201)
Persistence and degradability
Biodegradability anaerobic - Exposure time 28 d(Cesium formate)
Result: 83 % - Readily biodegradable.
(OECD Test Guideline 301D)
Bioaccumulative potential
No data available
Mobility in soil
No data available(Cesium formate)
Results of PBT and vPvB assessment
PBT/vPvB assessment not available as chemical safety assessment not required/not conducted
Other adverse effects
No data available


Waste treatment methods
Offer surplus and non-recyclable solutions to a licensed disposal company. Contact a licensed professional waste disposal service to dispose of this material.
Contaminated packaging
Dispose of as unused product.


Not dangerous goods
Not dangerous goods
Not dangerous goods


SARA 302 Components
No chemicals in this material are subject to the reporting requirements of SARA Title III, Section 302.
SARA 313 Components
This material does not contain any chemical components with known CAS numbers that exceed the threshold (De Minimis) reporting levels established by SARA Title III, Section 313.
SARA 311/312 Hazards
Acute Health Hazard
Massachusetts Right To Know Components
No components are subject to the Massachusetts Right to Know Act.
Pennsylvania Right To Know Components
Cesium formate
Revision Date
New Jersey Right To Know Components
Cesium formate
Revision Date
California Prop. 65 Components
This product does not contain any chemicals known to State of California to cause cancer, birth defects, or any other reproductive harm.


Safety Data Sheet according to Regulation (EC) No. 1907/2006 (REACH). The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The information in this document is based on the present state of our knowledge and is applicable to the product with regard to appropriate safety precautions. It does not represent any guarantee of the properties of the product. American Elements shall not be held liable for any damage resulting from handling or from contact with the above product. See reverse side of invoice or packing slip for additional terms and conditions of sale. COPYRIGHT 1997-2022 AMERICAN ELEMENTS. LICENSED GRANTED TO MAKE UNLIMITED PAPER COPIES FOR INTERNAL USE ONLY.

About Cesium Formate Solution

Cesium Formate Solution (Cesium Formate Brine, or CsFo) is an aqueous solution of cesium formate used primarily by the oil and gas industry as a drilling fluid, drill tip lubricant, and a foundation stabilizer due to its high density, environmental friendliness, and stability under high temperature and pressure environments. Cesium formate brines have numerous other industrial and chemical applications. It has also been used as a precursor material for cesium tin iodide (CsSnI3), a promising semiconducting perovskite crystal for highly efficient photovoltaic solar cells. American Elements produces cesium formate in 80% aqueous solution in numerous standard grades and purities, from Technical Grade to 99.99+% (metals basis), in addition to cesium formate powder and chunks; we can also manufacture to customer specifications. Typical and custom packaging is available, as is additional research, technical and safety (MSDS) data. Please follow the links above to request a quote, indicating the general quantity and any specifications you require.

Cesium Formate Solution Synonyms

CsCOOH; CsFo; Caesium formate solution; Formic acid, cesium salt, cesium formate brine; aqueous cesium formate

Chemical Identifiers

Linear Formula CsOOCH
MDL Number MFCD00039103
EC No. 222-492-8
Beilstein/Reaxys No. 3912426
Pubchem CID 23663999
IUPAC Name cesium; formate
InchI Identifier InChI=1S/CH2O2.Cs/c2-1-3;/h1H,(H,2,3);/q;+1/p-1

Packaging Specifications

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Shipping documentation includes a Certificate of Analysis and Safety Data Sheet (SDS). Solutions are packaged in polypropylene, plastic or glass jars up to palletized 440 gallon liquid totes, and 36,000 lb. tanker trucks.

Related Elements


See more Cesium products. Cesium (or Caesium) (atomic symbol: Ce, atomic number: 55) is a Block S, Group 1, Period 6 element with an atomic weight of 132.9054519. The number of electrons in each of Cesium's shells is 2, 8, 18, 18, 8, 1 and its electron configuration is [Xe]6s1. Cesium Bohr ModelThe cesium atom has a radius of 265 pm and a Van der Waals radius of 343 pm. Cesium is a member of the alkali group of metals. It is one of three metals that occur as a liquid at room temperature, the others being mercury and gallium. Elemental CesiumCesium's main commercial source is pollucite ore; however, it is also found in beryl, avogadrite, pezzottaite, and londonite. Cesium was discovered by Robert Bunsen and Gustav Kirchhoff in 1860 and first isolated by Carl Setterberg in 1882. In its elemental form, cesium has a silvery gold appearance. The word Cesium originates from the Latin word "caesius," meaning "sky blue," which refers to the vibrant blue lines in its spectrum.


July 25, 2024
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