IUPAC Name: Mercury(2+); oxygen(2-); sulfate
Synonyms of Mercury oxide sulfate (CAS NO.1312-03-4): Basic mercuric sulfate ; Mercuric basic sulfate ; Mercuric subsulfate ; Mercury oxonium sulfate ; Mercury sulfate, basic ; Trimercury dioxide sulphate
CAS NO: 1312-03-4
Molecular Formula: Hg₃O₆S
Molecular Weight : 729.8314
Molecular Structure:
EINECS: 215-191-8
H bond acceptors: 4
H bond donors: 2
Freely Rotating Bonds: 0
Polar Surface Area: 82.98 Å²
Enthalpy of Vaporization: 62.94 kJ/mol
Boiling Point: 330 °C at 760 mmHg
Vapour Pressure: 3.35E-05 mmHg at 25°C 
Appearance: A lemon-yellow powder or bright yellow scaly material.
Water solubility: Mercury oxide sulfate (CAS NO.1312-03-4) is very slightly soluble in water.

Mercury and its compounds are on the Community Right-To-Know List.

RIDADR: 2025
HazardClass: 6.1(a)
PackingGroup: II

A poison. When heated to decomposition it emits very toxic fumes of Hg and SO_x. See also MERCURY COMPOUNDS, INORGANIC; MERCURY COMPOUNDS, ORGANIC.

OSHA PEL: CL 0.1 mg(Hg)/m³ (skin)
ACGIH TLV: TWA 0.1 mg(Hg)/m³ (skin); BEI: 35 µg/g creatinine total inorganic mercury in urine preshift; 15 µg/g creatinine total inorganic mercury in blood at end of shift at end of workweek.
NIOSH REL: (Mercury, Aryl and Inorganic) CL 0.1 mg/m³ (skin)

1.Reactivity Profile: trimercury dioxide sulphate is soluble in acids. Incompatible with acetylene, ammonia, chlorine dioxide, azides, calcium (amalgam formation), sodium carbide, lithium, rubidium, copper .
2.Health Hazard: Mercury oxide sulfate (CAS NO.1312-03-4) is highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.
3.Fire Hazard :Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Containers may explode when heated. Runoff may pollute waterways.