Silicon Carbide

Description

Silicon Carbide (Black) · CAS 409-21-2 · CSi. Melting Point: 2600 °C; Melting Point: 2830 °C; Density: 3.23.

Identification

CAS Registry Number	409-21-2
PubChem CID	9863
Molecular formula	CSi
IUPAC name	methanidylidynesilanylium

Computed Descriptors

Molecular Weight	40.096
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	1
Rotatable Bond Count	0
Exact Mass	39.976926534
Monoisotopic Mass	39.976926534
Topological Polar Surface Area	0
Heavy Atom Count	2
Formal Charge	0
Complexity	10

Physical & Chemical Properties

Melting Point	2600 °C
Melting Point	2830 °C
Density	3.23
Density	3.2 g/cm³
Density	3.16 @25 °C
Vapor Pressure	0 mmHg (approx) (NIOSH, 2024)
Vapor Pressure	0 mmHg (approx)
Ionization Potential	9.30 eV

Physical description & handling notes

• Silicon carbide appears as yellow to green to bluish-black, iridescent crystals. Sublimes with decomposition at 2700 °C. Density 3.21 g cm-3. Insoluble in water. Soluble in molten alkalis (NaOH, KOH) and molten iron.
• Dry Powder; Wet Solid; CBI; Large Crystals; Other Solid; Dry Powder; Liquid
• Yellow to green to bluish-black, iridescent crystals; [NIOSH]
• YELLOW-TO-GREEN-TO-BLUE-TO-BLACK CRYSTALS, DEPENDING ON PURITY.
• Yellow to green to bluish-black, iridescent crystals.
• EXCEEDINGLY HARD, GREEN TO BLUISH-BLACK, IRIDESCENT, SHARP CRYSTALS

Regulatory Status

GHS notification summary	70.3% (740 / 1053)

GHS Hazard Classification

GHS notification summary	70.3% (740 / 1053)
Reported hazard statements	H372 (16.1%), H225 (100%), H315 (100%), H319 (100%), H335 (100%), H336 (100%), H350, H351

Documented Uses

• Used as an abrasive and refractory material; Produced in furnaces containing petroleum coke and crystalline silica at a temperature of >2200 degrees C for 36 hours; [ACGIH]
• Abrasive Blasting [Category: Clean]
• Polishing glass, granite; smoothing bisque ware; in sharpening stones; abrasive;manufacture /of/ porcelain, "emery" paper and wheels, shoe soles, refractory brick, furnace linings; antiskid pavements; in semiconductor technology.
• COMPONENT OF TREADS & BRAKE LININGS; COMPONENT OF HEATING ELEMENTS FOR ELECTRICAL FURNACES; FIBERS IN MATERIALS TO RESIST HIGH RE-ENTRY TEMPS & ROCKET NOZZLE COMPOSITES; COMPONENT OF THERMISTORS & VARISTORS; STRUCTURAL COMPONENTS IN NUCLEAR REACTORS; DEOXIDANT IN FERROUS METALLURGY.
• Abrasive for cutting and grinding metals, grinding wheels, refractory in non-ferrous metallurgy, ceramic industry and boiler furnaces, composite tubes for steam reforming operations. Fibrous form used in filament-wound structures and heat-resistant, high-strength composites.
• EPA Safer Chemical Functional Use Classes -> Processing Aids and Additives

Synonyms

SILICON CARBIDE; 409-21-2; Carborundum; Silicon monocarbide; Crystar; Betarundum; Carborundeum; Tokawhisker; Carbolon; Nicalon; Silundum; Silicon carbide (SiC); Carbon silicide; Green densic; Carbofrax M; Betarundum UF

Frequently Asked Questions

What are the CAS number and molecular formula of Silicon Carbide (Black)?

CAS 409-21-2; molecular formula CSi; molecular weight — g/mol.

What other names is Silicon Carbide (Black) known by?

SILICON CARBIDE, 409-21-2, Carborundum, Silicon monocarbide, Crystar, Betarundum.

Is Silicon Carbide (Black) classified as hazardous?

70.3% of GHS notifications report no hazard classification (740 of 1053).

What are the key physical properties of Silicon Carbide (Black)?

Melting Point: 2600 °C; Melting Point: 2830 °C; Density: 3.23; Density: 3.2 g/cm³.

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.