Melting point :17-19 °C (lit.)
Boiling point :167 °C/10 mmHg (lit.)
Density :1.475-1.485 g/mL at 20 °C 1.481 g/mL at 25 °C (lit.)
vapor density :3.3 (vs air)
vapor pressure :1 mm Hg ( 20 °C)
refractive index :n20/D 1.429(lit.)
Flash point :>230 °F
storage temp. :2-8°C
solubility :water: soluble1,000 g/L at 20°C
pka :-2.6(at 25℃)
form :Solution
Specific Gravity :1.48 (18/4℃)
color :brown
Water Solubility :Miscible with water. Slightly miscible with benzene and toluene. Immiscible with paraffins.
λmax :λ: 240-320 nm Amax: <0.4
Sensitive :Light Sensitive & Hygroscopic
Merck :14,5954
BRN :1446024
Stability :Stable. Moisture sensitive. Incompatible with amines, bases, water, common metals. Releases a substantial amount of heat when diluted with water (add acid to water with care if diluting).
InChIKey :AFVFQIVMOAPDHO-UHFFFAOYSA-N
CAS DataBase Reference :75-75-2(CAS DataBase Reference)
NIST Chemistry Reference :CH3SO3H(75-75-2)
EPA Substance Registry System :Methanesulfonic acid (75-75-2)

Symbol(GHS):
Signal word:	Danger
Hazard statements:	Code Hazard statements Hazard class Category Signal word Pictogram P-Codes H290 May be corrosive to metals Corrosive to Metals Category 1 Warning P234, P390, P404 H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, 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 H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:	P234 Keep only in original container. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. 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.