Melting point :-47 °C (lit.)
Boiling point :153-154 °C (lit.)
Density :0.95 g/mL at 25 °C (lit.)
vapor density :3.04 (vs air)
vapor pressure :1.5 mm Hg ( 20 °C)
refractive index :n20/D 1.393(lit.)
FEMA :2222 | ISOBUTYRIC ACID
Flash point :132 °F
storage temp. :Store below +30°C.
solubility :618g/l
form :Liquid
pka :4.84(at 20℃)
color :Clear colorless
PH :3.96(1 mM solution);3.44(10 mM solution);2.93(100 mM solution);
Odor :at 1.00 % in propylene glycol. acidic sour cheese dairy buttery rancid
Odor Type :acidic
Odor Threshold :0.0015ppm
explosive limit :1.6-7.3%(V)
Water Solubility :210 g/L (20 ºC)
Merck :14,5155
JECFA Number :253
BRN :635770
Dielectric constant :2.6（Ambient）
InChIKey :KQNPFQTWMSNSAP-UHFFFAOYSA-N
LogP :1.1 at 25℃
CAS DataBase Reference :79-31-2(CAS DataBase Reference)
NIST Chemistry Reference :Propanoic acid, 2-methyl-(79-31-2)
EPA Substance Registry System :Isobutyric acid (79-31-2)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H226 Flammable liquid and vapour Flammable liquids Category 3 Warning H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501 H311 Toxic in contact with skin Acute toxicity,dermal Category 3 Danger P280, P302+P352, P312, P322, P361,P363, P405, P501 H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501
Precautionary statements:	P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking. P233 Keep container tightly closed. P280 Wear protective gloves/protective clothing/eye protection/face protection. P301+P312 IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.