Propionic Acid CAS# 79-09-4

Boiling point 

141 °C(lit.)

density 

0.993 g/mL at 25 °C(lit.)

vapor density 

2.55 (vs air)

vapor pressure 

2.4 mm Hg ( 20 °C)

FEMA 

2924 | PROPIONIC ACID

refractive index 

n20/D 1.386(lit.)

Fp 

125 °F

storage temp. 

Store below +30°C.

solubility 

organic solvents: soluble(lit.)

pka

4.86(at 25℃)

form 

Liquid

Specific Gravity

0.996 (20/4℃)

color 

≤10, APHA:

PH

3.96(1 mM solution);3.44(10 mM solution);2.94(100 mM solution);

Odor

at 0.10 % in propylene glycol. pungent acidic cheesy vinegar

Odor Type

acidic

explosive limit

2.1-12%(V)

Odor Threshold

0.0057ppm

Water Solubility 

37 g/100 mL

JECFA Number

84

Merck 

14,7825

BRN 

506071

Exposure limits

TLV-TWA 10 ppm (～30 mg/m3) (ACGIH).

Dielectric constant

3.2（Ambient）

Stability:

Stable. Incompatible with strong oxidizing agents. Flammable.

InChIKey

XBDQKXXYIPTUBI-UHFFFAOYSA-N

LogP

0.33 at 25℃

CAS DataBase Reference

79-09-4(CAS DataBase Reference)

NIST Chemistry Reference

Propanoic acid(79-09-4)

EPA Substance Registry System

Propionic acid (79-09-4)

Safety Information

Risk Statements 

36/37/38-34-10

Safety Statements 

26-36-45-23

RIDADR 

UN 3463 8/PG 2

OEB

A

OEL

TWA: 10 ppm (30 mg/m3), STEL: 15 ppm (45 mg/m3)

WGK Germany 

1

RTECS 

UE5950000

Autoignition Temperature

955 °F

TSCA 

Yes

HazardClass 

8

PackingGroup 

II

HS Code 

29155010

Hazardous Substances Data

79-09-4(Hazardous Substances Data)

Toxicity

LD50 orally in rats: 4.29 g/kg (Smyth)