CAS 7601-90-3: Perchloric Acid (HClO4)

Identity

CAS Number7601-90-3
Molecular FormulaHClO4
IUPAC Nameperchloric acid
Molecular Weight100.46 g/mol
SMILESOCl(=O)(=O)=O
Synonymshyperchloric acid, HClO4, perchlorate acid

2D Structure

Physical Properties

Density1.768 g/mL at 25°C
Boiling Point203.0°C
Melting Point-112.0°C
Flash PointNone°C
Vapor Pressure0.007 kPa at 20°C
Refractive IndexnD = 1.444
Dielectric Constantε = 44.0

Safety & GHS Classification

GHS03GHS05Irritant

Storage: Store in glass or PTFE containers. NEVER store near organic materials — risk of explosion. Hot concentrated perchloric acid is an extreme explosion hazard. Use only in dedicated perchloric acid fume hoods with wash-down systems. Keep away from reducing agents.

Material Compatibility Matrix

Plastics

MaterialRating
PTFEExcellent
PVCGood
PEGood
PPGood
PEEKGood
PVDFGood

Rubbers

MaterialRating
VitonFair
NBRSevere Effect
EPDMFair
SiliconePoor
FKMFair

Metals

MaterialRating
Stainless 316Poor
AluminumPoor
CopperPoor
BrassPoor

Applications

External References: PubChem

Related Chemicals

CAS 110-82-7

Cyclohexane (C6H12)

hexamethylene, hexanaphthene

CAS 75-09-2

Dichloromethane (Methylene Chloride) (CH2Cl2)

methylene chloride, DCM

CAS 109-99-9

Tetrahydrofuran (THF) (C4H8O)

THF, oxolane