Mercuric thiocyanate

316.75500

317.92100

209-773-0

3JNH1DM7IF

1646

28521000

98.18000

1.32746

Mercury thiocyanate appears as an odorless white crystalline powder. Insoluble in water and denser than water. Hence sinks in water. Very toxic by inhalation and ingestion.

4.0 g/cm³ (approx)

165 °C (decomp)

146ºC at 760 mmHg

120 °C

Soluble in dilute hydrochloric acid, potassium cyanide and ammonia. Slightly soluble in alcohol and ether. Insoluble in water.

Store at RT.

Insoluble in water.

Salts, Basic

MERCURY THIOCYANATE decomposes into its elements at about 165°C. Burns readily in air to generate a coil of cohesive ash resembling a serpent (hence used in a firework: Pharaoh's serpents). Swells up to many times its original volume if heated (USCG, 1999). Soluble in dilute hydrochloric acid [Merck]. Incompatible with strong oxidizing agents.

II

6.1

UN 1646 6.1/PG 2

3

26/27/28-32-33-50/53

S13-S28-S45-S60-S61

XL1550000

T+,N

Stable. Incompatible with strong acids. May be light or moisture sensitive.

Missing Phrase - N15.00950417-P260-P262-P280-P302 + P352 + P310-P304 + P340 + P310

H300 + H310 + H330-H373-H410

Special Hazards of Combustion Products: When heated, decomposes into mercury, nitrogen, etc., at about 165°C. Behavior in Fire: When heated, swells up to many times its original volume. (USCG, 1999)

|Danger|H300 (100%): Fatal if swallowed [Danger Acute toxicity, oral]|P260, P262, P264, P270, P271, P273, P280, P284, P301+P310, P302+P350, P304+P340, P310, P314, P320, P321, P322, P330, P361, P363, P391, P403+P233, P405, and P501|Aggregated GHS information provided by 76 companies from 8 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.|H300: Fatal if swallowed [Danger Acute toxicity, oral]|P201, P202, P260, P261, P264, P270, P272, P280, P281, P301+P310, P302+P352, P305+P351+P338, P307+P311, P308+P313, P312, P314, P321, P322, P330, P332+P313, P333+P313, P337+P313, P361, P363, P405, and P501

Excerpt from ERG Guide 151 [Substances - Toxic (Non-combustible)]: SMALL FIRE: Dry chemical, CO2 or water spray. LARGE FIRE: Water spray, fog or regular foam. Move containers from fire area if you can do it without risk. Dike fire-control water for later disposal; do not scatter the material. Use water spray or fog; do not use straight streams. FIRE INVOLVING TANKS OR CAR/TRAILER LOADS: Fight fire from maximum distance or use unmanned hose holders or monitor nozzles. Do not get water inside containers. Cool containers with flooding quantities of water until well after fire is out. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks engulfed in fire. For massive fire, use unmanned hose holders or monitor nozzles; if this is impossible, withdraw from area and let fire burn. (ERG, 2016)

Excerpt from ERG Guide 151 [Substances - Toxic (Non-combustible)]: As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids. SPILL: Increase, in the downwind direction, as necessary, the isolation distance shown above. FIRE: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2016)

Excerpt from ERG Guide 151 [Substances - Toxic (Non-combustible)]: Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Prevent entry into waterways, sewers, basements or confined areas. Cover with plastic sheet to prevent spreading. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS. (ERG, 2016)

Dust mask or self-contained breathing apparatus, when required; rubber gloves, safety or chemical goggles, disposable clothing, or rubber apron. (USCG, 1999)

INHALATION: Acute poisoning symptoms are: Tightness in the chest, difficulty in breathing, coughing, and pain in the chest. EYES: Ulceration of conjunctiva and cornea. SKIN: Irritation, sensitization dermatitis. INGESTION: Necrosis, pain, vomiting, severe purging. Patient may die within a few hours from peripheral vascular collapse. (USCG, 1999)

Get medical attention. INHALATION: Remove from exposure. EYES: Flush with water. SKIN: Wash thoroughly with water. INGESTION: Give egg white, milk, or activated charcoal, then induce vomiting. Consult physician. (USCG, 1999)