Phosphor P-20









ESPI Metals

1050 Benson Way, Ashland, OR 97520

Toll Free (800) 638-2581 * Fax (541) 488-8313

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Product Name:     Phosphor P-20

Composition:        Zn CdS:Ag

Synonyms:           Zinc Cadmium Sulfide: Silver Activated, Phosphor Type 122




Hazardous Component:  Zinc        Cadmium           Silver

Percent (%):                  30-40       30-40               <0.1

OSHA/PEL:                      N/E         0.05 mg/m3          0.01 mg/m3

ACGIH/TLV:                    N/E          0.2 mg/m3           0.01 mg/m3





Boiling Point:                  N/A

Specific Gravity:             No Data

Solubility in H2O:            Insoluble

Appearance and Odor:   Pale yellow powder, no odor.




Flash Point:  N/A

Autoignition Temperature:  N/A

Flammable LimitsUpper:  N/A       Lower:  N/A

Extinguishing Media:  Use extinguishing agents suitable for the surrounding material and type of fire.

Special Fire Fighting ProceduresFirefighters must wear full face, self-contained breathing apparatus and full protective clothing to prevent contact with skin and eyes.

Unusual Fire & Explosion Hazard:  May burn to form sulfur dioxide at high temperatures (>950 oC).  Contact with strong acids will liberate hydrogen sulfide.  Hydrogen sulfide may form explosive mixtures with air.




Effects of Exposure:

To the best of our knowledge the chemical, physical and toxicological properties of phosphor p-20 have not been thoroughly investigated and recorded.

Zinc compounds have variable toxicity, but generally are of low toxicity.  Zinc is not inherently a toxic element.  However, when heated, it evolves a fume of zinc oxide which when inhaled fresh can cause a disease known as “brass founders”, “ague” or “brass chills.”  Zinc oxide dust which is not freshly formed is virtually innocuous.  There is no cumulative effect from the inhalation of zinc fumes.  (Sax, Dangerous Properties of Industrial Materials)

Cadmium compounds are confirmed carcinogens producing lung tumors.  Poison by ingestion.  Inhalation of fumes or dusts affects the respiratory tract and the kidneys.  Brief exposure to high concentrations may result in pulmonary edema and death.  Fatal concentrations may be breathed without sufficient discomfort to warn a worker to leave the exposure.  Cadmium oxide fumes can cause metal fume fever (Sax, Dangerous Properties of Industrial Materials).

Sulfides of the heavy metals are generally insoluble and hence have little toxic action except through the liberation of hydrogen sulfide. (Sax, Dangerous Properties of Industrial Materials).

Acute Effects:

Inhalation:  Acute effects are unlikely since the material is insoluble.  Excessive exposure to soluble cadmium salts may produce delayed effects after several hours, including cough, chest pain, sweating, chills, shortness of breath, and weakness.

Ingestion:  No data

Skin:  No acute effects recorded

Eye:  May cause irritation

Chronic Effects:

Inhalation:  Chronic poisoning by cadmium may cause kidney damage.

Ingestion:  Soluble cadmium salts may produce vomiting, abdominal pains, diarrhea, vertigo, and loss of consciousness.  Kidney damage may also result.

Skin:  Prolonged or repeated exposure may cause dermatitis.

Eye:  May cause irritation.


Medical Conditions Generally Aggravated by Exposure:  Pre-existing kidney disease

CarcinogenicityNTP:  Yes IARC:  Yes            ACGIH:  Yes



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

INGESTION:  Give one or two glasses of water and induce vomiting, seek medical attention.  Never induce vomiting or give anything by mouth to an unconscious person.

SKIN:  Remove contaminated clothing, brush material off skin, wash with soap and water, seek medical attention if symptoms persist.

EYE:  Flush eyes, including under eyelids, with water for at least 15 minutes.  Seek medical attention if symptoms persist.




Stability:  Stable

Conditions to Avoid:  N/A

Incompatibility (Material to Avoid):  Contact with acids generates hydrogen sulfide gas.

Hazardous Decomposition Products:  Oxide of sulfur, zinc oxide and cadmium oxide.

Hazardous Polymerization:  Will not occur.




Steps to Be Taken in Case Material Is Released or Spilled:  Wear appropriate respiratory and protective equipment specified in section VIII.  Isolate spill area and provide ventilation.  Scoop up or vacuum up spill using a high efficiency particulate absolute (HEPA) air filter and place in a closed container for proper disposal.  Take care not to raise dust.

Waste Disposal Method:  Dispose of in accordance with Local, State and Federal regulations.




Respiratory Protection: NIOSH approved respirator.

Ventilation:  Use local exhaust to maintain concentration at or below the PEL, TLV.  General exhaust is not recommended.

Eye Protection:  Safety glasses.

Protective Gloves:  Rubber gloves.

Other Protective Clothing or Equipment:  Protective gear suitable to prevent contamination.




Precautions to Be Taken in Handling and Storage:  Store in a cool, dry place away from possible contact with strong acids.  Store in a tightly sealed container.  Use clean-up methods which minimize dust generation such as vacuuming or wet clean-up.  If airborne dust is generated, use an appropriate NIOSH approved respirator.  Wash thoroughly after handling.

Work Practices:  Implement engineering and work practice controls to reduce and maintain concentration of exposure at low levels.  Use good housekeeping and sanitation practices.  Do not use tobacco or food in work area.  Wash thoroughly before eating and smoking.  Do not blow dust off clothing or skin with compressed air.  Maintain eyewash capable of sustained flushing, safety drench shower and facilities for washing.

Note:  This material is subject to the reporting requirements of section 313 of Title III of the superfund amendments and re-authorization Act of 1986 and 40 CFR Part 372.

TSCA Listed:  Yes


DOT Regulations:

Hazard Class:                       6.1

Identification Number:       UN2570

Packing Group:                   III

Proper Shipping Name:      Cadmium compound (Zinc cadmium sulfide)


The above information is believed to be correct, but does not purport to be all inclusive and shall be used only as a guide.  ESPI shall not be held liable for any damage resulting from contact or from handling the above product.


Issued by:                             S. Dierks

Revised/Verified:                   October 2010