Ethyl hydroperoxide (CAS 3031-74-1)

CAS Number

3031-74-1

Molecular Formula

C2H6O2

Molecular Weight

62.07

EINECS Number

221-211-6

MDL Number

MFCD00048684

BRN Number

1098254

Last Updated

6/1/2026

Appearance

Colorless clear liquid (pure state), highly volatile

Appearance State

Liquid. Readily soluble in water, ethanol, and ether.

Color

Colorless

Odor

Sharp, strongly pungent and characteristic odor

Form

Clear Liquid

Melting Point

<-10 °C

Boiling Point

95 °C (Normal pressure measured. Highly explosive under heat due to low molecular weight and active hydroperoxide bond, heating to boiling point is strictly prohibited, this value has no safety significance)

Flash Point

18.3 °C (predicted)

Density

0.948 g/cm³

Vapor Density

2.14 (air=1)

Vapor Pressure

42.5 mmHg @ 25 °C

Refractive Index

1.364 (predicted)

LogP Value

-0.22 (predicted)

Merck Index

Not Specified

Solubility

Easily soluble in water, miscible with ethanol, ether, and most common organic solvents

Water Solubility

Easily soluble (miscible with water) (Pure substance has excellent miscibility. Due to volatility and thermal decomposition risk, preparation/dilution must be under strict ice-bath and explosion-proof shield)

Solubility Detail

Easily soluble in water. As a lower alkyl hydroperoxide, its pure form possesses extreme thermal and mechanical (friction/shock) sensitivity and poses a severe explosion hazard. Consequently, storing or transporting this substance in its highly purified, concentrated form is strictly prohibited. It must be phlegmatized and maintained as a stabilized dilute aqueous solution or in designated safe solvent systems.

Storage Conditions

Must be handled according to high-risk, temperature-controlled organic peroxide standards. Ambient storage/transportation is strictly forbidden; it must be force-refrigerated between -20°C and 0°C. Due to its high volatility and low SADT, improper sealing can easily lead to vapor accumulation and subsequent thermal runaway or flash explosion. Store in an isolated, high-standard explosion-proof hazardous warehouse equipped with automatic emergency pressure relief and dedicated ventilation. Protect from moisture, light, friction, and mechanical shock. Keep strictly isolated from reducing agents, acids, bases, heavy metals, and transition metal powders.

InChI Key

ILHIHKRJJMKBEE-UHFFFAOYSA-N

Signal Word

Danger

Hazard Symbols

E, O, C

Risk Codes

R2, R3, R5, R8, R34

UN Number

UN 3115 (Organic peroxide liquid, Type D, temperature controlled) or UN 3117 (Depending on active oxygen content, diluent type and temperature control of specific formulation)

IARC Classification

Not Classified

WGK Germany

2

RTECS Number

Not Specified

Auto-ignition Temperature

ca. 40 °C (自加速分解温度 SADT)

TSCA Listed

Not Listed

Packing Group

II

Customs Code

2909600000

Occupational Exposure Band (OEB)

Not Specified

Occupational Exposure Limit (OEL)

Not Specified

Immediately Dangerous to Life or Health (IDLH)

Not Specified