MERCURIC THIOCYANATE 

Safety Data Sheet  
Emergency Telephone Number: CHEMTREC 1-800-424-9300                For Information call: DUDLEY 732-886-3100        
      DUDLEY CORPORATION
          	          125 Kenyon Drive
      				          	Lakewood, New Jersey 08701
Effective Date: January 1, 2025
1. PRODUCT ID: Syn: Mercury (II) Thiocyanate; Mercuric Sulfocyanate. CAS No.: 592-85-8.  E-C No.:209-773-0   
Weight: 316.75.                Formula:C2HgN2S2. 

2. HAZARDS ID:  GHS Class:  Acute toxicity, Oral (Category 2) Acute toxicity, Inhalation (Category 2) 
Specific target organ toxicity – repeated exposure (Category 2)
          Acute toxicity, Dermal (Category 1)    Chronic aquatic toxicity (Category 1) Acute aquatic toxicity (Category 1)
	 		                                       	
Signal word:  Danger
Hazard statement(s): H300 + H310+H330 	Fatal if swallowed or in contact with skin or inhaled.
H373: May cause damage to organs (Nervous system) through prolonged or repeated exposure.
H410: Very toxic to aquatic life with long lasting effects.
Precautionary statement(s): P260: Do not breathe dust/fume/gas/mist/vapors/spray.   P391: Collect spillage
P262: Do not get in eyes, on skin, or on clothing. P264: Wash skin thoroughly after handling.  P405: Store locked up.
P270: Do not drink, eat, smoke, when using this product. P271: Use only outdoors or in a well-ventilated area.
P273: Avoid release into environment.  P280: Wear protective gloves/eye & face protection P284: Wear respiratory protection.  P301 + P310: If swallowed: Immediately Call Poison Center or doctor/physician. 
P302 + P350: If on skin gently wash with plenty of soap & water.  P314: Get medical attention if you feel unwell
P304 + P340: If inhaled: remove to fresh air and keep at rest in a position comfortable for breathing.  P330: Rinse mouth	
P362; Take off & wash all contaminated clothing. P403 + P233: Store in a well-ventilated place. Keep container tightly closed. P501: Dispose of contents/container to an approved waste disposal plant.

HMIS Classification: Health hazard  4, Flammability   1,  Physical hazards   0			
NFPA Rating: Health hazard  4, Fire    1, Reactivity hazard   0
2.3: Other Hazards: none

3. COMPOSITION / INFO: 
Chemical Name 			         CAS No.	     Percent	Hazardous
Mercury (II) thiocyanate                                 592-85-8              90 -100%                Yes 

4. FIRST AID: Eyes: Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Skin: Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Ingestion: If victim is conscious and alert, give 2-4 cupfuls of milk or water.  Do NOT induce vomiting.  NEVER give anything by mouth to an unconscious person. If swallowed get medical attention immediately and show this container or label.  Inhalation: Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. 
 
5. FIRE FIGHTING: Info: wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH & full PPE.  Irritating & highly toxic gases may be generated by thermal decomp/combustion.  Runoff from fire control or dilution water may cause pollution. Hazards: Carbon, nitrogen sulfur & mercury oxides. Extinguishing:  dry chemical powder

6. ACCIDENTAL RELEASE: Info: Use proper PPE as indicated in Section 8. Spills/Leaks: Vacuum or sweep up material and place into a suitable disposal container.  Clean up spills immediately, observing precautions in the Protective Equipment section.  Avoid generating dusty conditions.  Provide ventilation. Do not let product enter drains, entrance into the environment should be avoided. 

7. HANDLING & STORAGE: Handling: Do not get in eyes, on skin, or on clothing. Do not ingest or inhale. Use only in a chemical fume hood. Avoid prolonged or repeated exposure. Storage: Store in a cool, dry place. Do not store in direct sunlight. Store in a tightly closed container. Poison room locked. Do not store near acids. Light and Moisture sensitive. 

8. EXPOSURE CONTROLS / PPE: Facilities storing or utilizing this material should be equipped with an eyewash facility and a safety shower. Use adequate ventilation to keep airborne concentrations low.
Chemical Name                     ACGIH                       		NIOSH                                                           OSHA - Final PELs 
Mercury dithiocyanate         TWA 0.025 mg/m3       0.05 mg/m3 TWA 0.1mg/m3 (C)		0.1mg/m3 (C)

PPE: Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA’s eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. 0.11 mm thick nitrile. Clothing: Wear appropriate protective clothing to minimize contact with skin. Respirators: Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard En 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary. Hygiene: Avoid contact with skin, eyes and clothing. Wash hands before breaks and immediately after handling the product.

9. PHYSICAL & CHEM: Appearance: White powder Melting Pt: 165˚C (329˚F)
 Flash Pt:  248° F  120° C. Relative Density: 3.71 g/cm3 at 25˚C (77˚F) Decomp temp: >110 deg C

10. STABILITY & REACTIVITY:  Stability:  Stable at room temp under normal storage & handling.  Avoid:  Exposure to moisture, light over a prolonged period. Incompatibilities:  Strong oxidizing agents, Nitric acid, Peroxides, Chlorates Haz Decomp:  see sec 5

11.  TOXICOLOGICAL INFO: RTECS#: not available. LD50/LC50: Rat Oral – 46mg/kg  Dermal – 5mg/kg
Carcinogenicity: Not listed by ACGIH, NIOSH, NTP, or OSHA. 
IARC Group 3- not classified carcinogenicity to humans. (mercury dithiocyanate)

12.  ECOLOGICAL INFO: Fate: Very toxic to aquatic organisms, may cause long-term adverse effects 
LC50-fathead minnow – 0.15mg/l-96h	EC50-Water Flea – 0.0052mg/l -96h   IC50-Ankistrodesmus falcatus – 0.162mg/l – 96h

13.  DISPOSAL CONSIDERATIONS: Chemical waste generators must determine whether a discarded chemical is classified as a hazardous waste.  US EPA guidelines for the classification determination are listed in 40 CFR Parts 261.3.  Additionally, waste generators must consult state and local hazardous waste regulations to ensure complete and accurate classification. Contact a licensed professional waste disposal service to dispose of this material. RCRA P-Series:  None listed. RCRA U-Series:  None listed.

14.  TRANSPORT REGULATIONS:  RQ 10lbs.   DOT: UN 1646, Mercury thiocyanate, 6.1, II, ERG 151
IMDG: UN 1646, MERCURY THIOCYANATE, 6.1, II  	10 lbs Marine Pollutant.
IATA: UN 1646, Mercury thiocyanate, 6.1, II	

15.  REGULATORY INFO: SARA 311/312:  Acute Health Hazard
CERCLA Hazardous Substances and corresponding RQs CAS# 592-85-8: 10 lb final RQ; 4.54 kg final RQ.
SARA Section 302 Extremely Hazardous Substances None of the chemicals in this product have a TPQ.
Section 313 This material contains Mercury (II) Thiocyanate,  (listed as Mercury compounds), 100.0%, (592-85-8) which is subject to the reporting requirements of Section 313 of SARA Title III and 40 CFR Part 373.
STATE CAS# 592-85-8 is not present on state lists from CA, MN, MA, FL. 
MA Right to Know: CAS# 592-85-8:  Mercury dithiocyanate Rev. 3/1/2007
PA Right to Know: CAS# 592-85-8:  Mercury dithiocyanate Rev. 3/1/2007
NJ Right to Know: CAS# 592-85-8:  Mercury dithiocyanate Rev. 3/1/2007
California Prop.65 components: WARNING: This product contains a chemical known to the State of CA to cause birth defects or other reproductive harm CAS# 592-85-8:  Mercury dithiocyanate Rev. 4/24/93

EUROPEAN/INTERNAITONAL REGULATION Hazard Symbols:   T+ - N  WGK: CAS# 592-85-8:  3
CANADA – DSL/NDSL: CAS# 592-85-8 is listed on Canada’s DSL List. But not listed on Canada’s NDSL List.
CANADA – WHMIS: This product has been classified in accordance with the hazard criteria of the CPR, and the SDS contains all the information required by the CPR.
Canadian Ingredient Disclosure List:  CAS# 592-85-8 is listed on the Canadian Ingredient Disclosure List.

16. DISCLAIMER INFO: DUDLEY CORPORATION provides the information herein in good faith but makes no representation as to its comprehensiveness or accuracy. This document is intended only as a guide to the appropriate precautionary handling of the material by a properly trained person using this.  Individuals receiving the information must exercise their independent judgment in determining its appropriateness for a particular purpose. DUDLEY CORPORATION makes no representations or warranties, either expressed or implied, including without limitation and warranties of merchantability, fitness for a particular purpose with respect to the information set forth herein or to the product to which the information refers. Accordingly, DUDLEY CORPORATION will not be responsible for damages resulting from the use of or reliance upon this information.