Litharge (PbO) (9CI)

Description

Litharge (PbO) (9CI) · CAS 79120-33-5 · OPb. UNII NS00093483. Boiling Point: 1472 °C; Boiling Point: 1470 °C; Melting Point: 887 °C.

Identification

CAS Registry Number	79120-33-5
PubChem CID	14827
Molecular formula	OPb
IUPAC name	oxolead
UNII (FDA)	NS00093483

Computed Descriptors

Molecular Weight	223
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	1
Rotatable Bond Count	0
Exact Mass	223.97157
Monoisotopic Mass	223.97157
Topological Polar Surface Area	17.1
Heavy Atom Count	2
Formal Charge	0
Complexity	2

Physical & Chemical Properties

Boiling Point	1472 °C
Boiling Point	1470 °C
Melting Point	887 °C
Melting Point	888 °C
Solubility	Water: 0.017 g/L at 20 °C
Density	9.64 g/cu cm
Density	9.5 g/cm³

Physical description & handling notes

• Litharge appears as odorless gray or yellow green or red-brown solid. Sinks in water. (USCG, 1999)
• Dry Powder; Other Solid
• Red to yellow crystals; [ICSC] Practically insoluble in water (17 mg/L at 20 deg C); [ATSDR ToxProfiles]
• RED-TO-YELLOW CRYSTALS.
• Exists in 2 forms: red to reddish-yellow, tetragonal crystals at ordinary temperature; yellow, orthorhombic crystals, stable above 489 °C
• Yellow orthorhombic crystals

Regulatory Status

GHS notification summary	1.1% (9 / 841)

GHS Hazard Classification

GHS notification summary	1.1% (9 / 841)
Reported hazard statements	H302, H332 (20.3%), H351 (56.5%), H360 (83.5%), H362 (34.6%), H372 (48.8%), H373 (50.1%), H400 (74.7%)

Documented Uses

• Used in ointments, plasters, pottery glazes, glass flux, lead glass, varnishes, metal cements, colorants (brass, bronze, hair, nails, wool, and horn), and rubber pigments; Also used to make boiled linseed oil and to assay gold and silver ores; [Merck Index] Used in storage batteries, high-temperature lubricants, capacitors, electrophotographic plates, transducers, and magnetic materials; [HSDB]
• Battery Manufacturing [Category: Industry]
• Glass Manufacturing [Category: Industry]
• Metal Extraction and Refining [Category: Industry]
• Ceramics making [Category: Hobbies]
• Storage batteries, ceramic cements and fluxes, pottery and glazes, glass, chromium pigments, oil refining, varnishes, paints, enamels; assay of precious metal ores, manufacture of red lead, cement (with glycerol), acid-resisting compositions, match-head compositions, other lead compounds, rubber accelerator.

Synonyms

Lead monoxide; Lead(II) oxide; 1317-36-8; Litharge; oxolead; Lead oxide (PbO); Lead Oxide Yellow; Lead protoxide; Plumbous oxide; Yellow Lead Ocher; Litharge Pure; 79120-33-5; Plumbi monoxidum; Plumbum oxydatum; Lead oxide (VAN); plumbanone

Frequently Asked Questions

What are the CAS number and molecular formula of Litharge (PbO) (9CI)?

CAS 79120-33-5; molecular formula OPb; molecular weight — g/mol.

What other names is Litharge (PbO) (9CI) known by?

Lead monoxide, Lead(II) oxide, 1317-36-8, Litharge, oxolead, Lead oxide (PbO).

Is Litharge (PbO) (9CI) classified as hazardous?

1.1% of GHS notifications report no hazard classification (9 of 841).

What are the key physical properties of Litharge (PbO) (9CI)?

Boiling Point: 1472 °C; Boiling Point: 1470 °C; Melting Point: 887 °C; Melting Point: 888 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.