Mercury thiocyanate

  • Mercuric thiocyanate
  • Mercury(II) thiocyanate
  • Mercury dithiocyanate
Formula
Hg(SCN)2
Structure
Description
An odorless white crystalline powder.
Uses
In manufacture of pharaoh's serpents (fireworks), intensifier in photography.

Registry Numbers and Inventories.
CAS
592-85-8
EC (EINECS/ELINCS)
209-773-0
RTECS
XL1550000
RTECS class
Other
UN (DOT)
1646
Merck
12,5946
Beilstein/Gmelin
3561344
Beilstein Reference
4-03-00-00299
RCRA
D009
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
2CNS*Hg
Formula mass
316.76
Melting point, °C
-38.9
Vapor pressure, mmHg
0.0012
Vapor density (air=1)
11
Odor Threshold Odor threshold Odorless
Density
4 g/cm3 (20 C)
Solubility in water
Slightly soluble

Hazards and Protection.
Storage
Store in a cool, dry place. Do not store in direct sunlight. Store in a tightly closed container. Poison room locked.
Handling
Do not get in eyes, on skin, or on clothing. Do not ingest or inhale. Use only in a chemical fume hood.
Protection
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. 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.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container.
Stability
No data.
Incompatibilities
Strong oxidizing agents.
Decomposition
Carbon monoxide, oxides of nitrogen, oxides of sulfur, carbon dioxide, mercury/mercury oxides.

Fire.
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use water in flooding quantities as fog. Use alcohol foam, dry chemical or carbon dioxide.
Fire potential
Nonflammable, but expands to many times in volume when heated.
Combustion products
When heated, decomposes into mercury, nitrogen, etc., at about 165C.

Health.
Exposure limit(s)
NIOSH REL: C 0.1 mg/m3 [skin] OSHA PEL: C 0.1 mg/m3 10 mg/m3 (as Hg)
Exposure effects
May cause liver and kidney damage. May cause reproductive and fetal effects. Repeated exposure may cause central nervous system damage. May cause tremors, irritability, loss of memory and intellect. May also cause Pink disease characterized by skin, cardiovascular, and neurobehavioral abnormalities.
   Ingestion
May be fatal if swallowed. May cause kidney damage. May cause liver damage. May cause perforation of the digestive tract. May cause vascular collapse and damage. Causes severe pain, nausea, vomiting, diarrhea, and shock. May cause central nervous system effects.
   Inhalation
May cause irritation of the respiratory tract with burning pain in the nose and throat, coughing, wheezing, shortness of breath and pulmonary edema. May cause effects similar to those described for ingestion.
   Skin
May cause severe skin irritation. Harmful if absorbed through the skin. Causes redness and pain.
   Eyes
Contact with eyes may cause severe irritation, and possible eye burns. Causes redness and pain.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. SPEED IS ESSENTIAL. A DOCTOR MUST BE NOTIFIED AT ONCE.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Get medical aid. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
1646
Response guide
Hazard class
6.1
Packing Group
II
 
USCG CHRIS Code
MRT
 
Std. Transport #
4923258