Mercury(II) sulfide

  • Red mercury sulfide
  • Vermilion
  • Chinese red
  • C.I. pigment 106
  • C.I. 77766
Formula
HgS
Structure
Description
Odorless red or black solid.
Uses
For coloring plastics, sealing wax, and with FeSO4 for marking linen.

Registry Numbers and Inventories.
CAS
1344-48-5
EC (EINECS/ELINCS)
215-696-3
RTECS
OX0720000
RTECS class
Other
UN (DOT)
2025
Merck
12,5945
Beilstein/Gmelin
13707 (G)
Swiss Giftliste 1
G-2833
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
HgS
Formula mass
232.65
Sublimation point, °C
580
Vapor pressure, mmHg
0.0012
Density
8.1 g/cm3
Solubility in water
Insoluble
Dielectric constant
30.6

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Store protected from moisture. Store protected from light.
Handling
Wash thoroughly after handling. Use with adequate ventilation. Avoid contact with skin and eyes. Avoid ingestion and inhalation.
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 prevent skin exposure.
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. Wash area with soap and water. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions.
Stability
May decompose when exposed to light.
Incompatibilities
Strong oxidizing agents, acids.
Decomposition
Oxides of sulfur, mercury/mercury oxides.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Substance is noncombustible; use agent most appropriate to extinguish surrounding fire.
Fire potential
Non-Combustible
Combustion products
Smoke from fire contains poisonous mercury vapor and irritating sulfur dioxide gas.

Health.
Exposure limit(s)
NIOSH TWA: 0.05 mg/m3
Poison_Class
2
Exposure effects
Prolonged or repeated exposure may cause adverse reproductive effects. May cause kidney injury. Chronic exposure to mercury may cause permanent central nervous system damage, fatigue, weight loss, tremors, personality changes.
   Ingestion
May cause irritation of the digestive tract.
   Inhalation
Causes respiratory tract irritation.
   Skin
Causes skin irritation.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid immediately. 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
2025
Response guide
Hazard class
6.1
Packing Group
I; II; III
 
USCG CHRIS Code
MSF