Cobalt Selenide







Product Name:   Cobalt Selenide

Formula:             CoSe

Supplier:             ESPI Metals

                            1050 Benson Way

                            Ashland, OR 97520

Telephone:          800-638-2581

Fax:                     541-488-8313

Email:                  This email address is being protected from spambots. You need JavaScript enabled to view it.

Emergency:        Infotrac 800-535-5053 (US) or 352-323-3500 (24 hour)

Recommended Uses:  Scientific Research




GHS Classification (29 CFR 1910.1200): Acute toxicity - oral, category 3, Acute toxicity - inhalation, category 3, Specific target organ toxicity - repeated exposure, category 2.

GHS Label Elements:

pictogramskullcrossbones     pictogramhealthhazard

Signal Word: Danger

Hazard Statements: H301 Toxic if swallowed, H331 Toxic if inhaled, H373 May cause damage to central nervous system, hair, nails and skin through prolonged or repeated oral or inhalation exposure.

Precautionary Statements: P260 Do not breath dust/fume/gas/mist/vapors/spray, P264 Wash hands thoroughly after handling, P270 Do not eat, drink or smoke when using this product, P271 Use only outdoors or in a well-ventilated area, P314 Get medical advice/attention if you feel unwell, P301+P310+P330 IF SWALLOWED: Rinse mouth. Immediately call a POISON CENTER or doctor/physician, P304+P340+P311 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing, call a POISON CENTER or doctor/physician, P403+P233 Store in a well-ventilated place. Keep container tightly closed, P405 Store locked up, P501 Dispose of contents/container in accordance with local, state or federal regulations.




Ingredient:     Cobalt (II) Selenide

CAS#:              1307-99-9

%:                   100

EC#:                215-155-1




General Measures: Remove patient from area of exposure.

INHALATION: Remove to fresh air, keep warm and quiet, give oxygen if breathing is difficult. Seek immediate medical attention.

INGESTION: Rinse mouth with water. Do not induce vomiting. Seek immediate medical attention. Never induce vomiting or give anything by mouth to an unconscious person.

SKIN: Remove contaminated clothing, brush material off skin, wash affected area with soap and water. Seek medical attention if irritation develops or persists.

EYES: Flush eyes with lukewarm water, including under upper and lower eyelids, for at least 15 minutes. Seek medical attention if irritation develops or persists.

Most Important Symptoms/Effects, Acute and Delayed: May cause irritation. See section 11 for more information.

Indication of Immediate Medical Attention and Special Treatment: No other relevant information available.




Extinguishing Media: Use suitable extinguishing agent for surrounding materials and type of fire.

Unsuitable Extinguishing Media: No information available.

Specific Hazards Arising from the Material: May release toxic fumes if involved in a fire.

Special Protective Equipment and Precautions for Firefighters: Wear full face, self-contained breathing apparatus and full protective clothing.




Personal Precautions, Protective Equipment, and Emergency Procedures: Wear appropriate respiratory and protective equipment specified in section 8. Isolate spill area and provide ventilation. Avoid breathing dust or fume. Avoid contact with skin and eyes. Eliminate all sources of ignition.

Methods and Materials for Containment and Cleaning Up: Avoid raising dust. Scoop or vacuum up using a vacuum system equipped with a HEPA filter. Place in properly labeled closed containers.

Environmental Precautions: Do not allow to enter drains or to be released to the environment.




Precautions for Safe Handling: Handle in an enclosed, controlled process. Avoid creating dust. Avoid breathing dust or fumes. Provide adequate ventilation if dusts are created. Avoid contact with skin and eyes. Wash thoroughly before eating or smoking. See section 8 for information on personal protection equipment.

Conditions for Safe Storage: Store in a cool, dry area. Store material tightly sealed in properly labeled containers. Protect from moisture. See section 10 for more information on incompatible materials.




Exposure Limits:                             OSHA/PEL:                              ACGIH/TLV:

Cobalt Selenide                                  No exposure limit established     No exposure limit established

Cobalt Metal (dust and fume, as Co)    0.1 mg/m3                                0.02 mg/m3

Selenium compounds (as Se)              0.2 mg/m3                                0.2 mg/m3

Engineering Controls: Handle in a controlled, enclosed environment. Whenever possible the use of local exhaust ventilation or other engineering controls is the preferred method of controlling exposure to airborne dust and fume to meet established occupational exposure limits. Use good housekeeping and sanitation practices. Do not use tobacco or food in work area. Wash thoroughly before eating or smoking. Do not blow dust off clothing or skin with compressed air.

Individual Protection Measures, Such as Personal Protective Equipment:

   Respiratory Protection: NIOSH approved respirator.

   Eye Protection: Safety glasses

   Skin Protection: Impermeable gloves, protective work clothing as necessary.





Form:                 Chunks

Color:                 No data

Odor:                  No data

Odor Threshold: Not determined

pH:                                              N/A

Melting Point:                             No data

Boiling Point:                              No data

Flash Point:                                 N/A

Evaporation Rate:                       N/A

Flammability:                             No data

Upper Flammable Limit:             No data

Lower Flammable Limit:             No data

Vapor Pressure:                          No data

Vapor Density:                            N/A

Relative Density (Specific Gravity):     7.65 g/cc

Solubility in H2O:                         No data

Partition Coefficient (n-octanol/water):   Not determined

Autoignition Temperature:         No data

Decomposition Temperature:     No data

Viscosity:                                     N/A




Reactivity: No specific test data available.

Chemical Stability: Stable under recommended storage conditions.

Possibility of Hazardous Reactions: No data

Conditions to Avoid: No data

Incompatible Materials: Strong acids, strong bases, strong oxidizing agents.

Hazardous Decomposition Products: Cobalt oxides, selenium oxides, hydrogen selenide.




Likely Routes of Exposure: Inhalation, skin and eyes.

Symptoms of Exposure: May cause irritation. Symptoms of exposure to selenium compounds may include hair and nail brittleness and loss, gastrointestinal disturbances, and central nervous system abnormalities. May cause a garlic-like odor to the breath and sweat.

Acute and Chronic Effects:

Cobalt Compounds: Exposure via inhalation or skin contact can result in sensitization in a small percentage of individuals, and can result in asthma-like symptoms or allergic dermatitis. Chronic exposure via inhalation may result in respiratory irritation, diminished pulmonary function, wheezing, asthma, pneumonia, and fibrosis. There is limited evidence in animals of carcinogenic effects.

Selenium Compounds: Inhalation of selenium compounds may cause respiratory, gastrointestinal, and cardiovascular effects, as well as irritation of the skin and eyes. Fatalities following inhalation exposure to selenium compounds have not been reported. Most of the information concerning effects in humans following exposure to selenium and selenium compounds is for exposure via ingestion. Symptoms of chronic selenium toxicity may include hair and nail brittleness and loss, gastrointestinal disturbances, skin rash, garlic breath odor, fatigue, irritability, nervous system abnormalities, and possible damage to heart and liver. Water-soluble selenium compounds are probably more toxic than elemental selenium. Selenium is an essential trace element in humans and animals.

Acute Toxicity: No data


Cobalt and cobalt compounds that release cobalt ions in vivo: NTP: R - reasonably anticipated to be a human carcinogen

Cobalt and Cobalt Compounds: IARC: 2B - Possibly carcinogenic to humans

To the best of our knowledge the chemical, physical and toxicological characteristics of the substance are not fully known.




Ecotoxicity: No data

Persistence and Degradability: No data

Bioaccumulative Potential: No data

Mobility in Soil: No data

Other Adverse Effects: Do not allow material to be released to the environment. No further relevant information available.




Waste Disposal Method:

Product: Dispose of in accordance with Federal, State and Local regulations.

Packaging: Dispose of in accordance with Federal, State and Local regulations.




UN Number:                           UN3283

UN Proper Shipping Name:   Selenium compound, solid, n.o.s. (Cobalt selenide)

Transport Hazard Class:       6.1

Packing Group:                      III

Marine Pollutant:                   No




TSCA Listed: Yes

DSL Listed: No

Regulation (EC) No 1272/2008 (CLP): Acute toxicity - oral, category 3, Acute toxicity - inhalation, category 3, Specific target organ toxicity - repeated exposure, category 2, Hazardous to the aquatic environment - acute hazard, category 1, Hazardous to the aquatic environment - chronic hazard, category 1.

WHMIS 2015 Classification: Acute toxicity, Specific target organ toxicity - repeated exposure.

HMIS Ratings: Health: 2*(chronic)     Flammability: 0     Physical: 0

NFPA Ratings: Health: 2     Flammability: 0     Instability: 0

Chemical Safety Assessment: A chemical safety assessment has not been carried out.




The information contained in this document is based on the state of our knowledge at the time of publication and is believed to be correct, but does not purport to be all inclusive and shall be used only as a guide. ESPI Metals makes no representation, warranty, or guarantee of any kind with respect to the information contained in this document or any use of the product based on this information. ESPI Metals shall not be held liable for any damages resulting from handling or from contact with the above product. Users should satisfy themselves that they have all current data relevant to their particular use.


Prepared by:             ESPI Metals

Revised/Reviewed:   January 2017