Alpha-Methylstyrene CAS #98-83-9
1. Versatile Industrial Application: Methylstyrene is widely used in polymer and resin production due to its unique chemical properties.
2. Low Melting Point: Its relatively low melting point (−24°C) allows for easy processing in various temperature-sensitive applications.
3. Stable Physical Properties: Boiling at 165–169°C and having a stable refractive index make it suitable for high-temperature applications.
4. Handling & Safety: Though volatile and flammable, methylstyrene’s safety is enhanced when stored under controlled conditions (2-8°C) and with proper handling to prevent ignition.
Methylstyrene is a colorless liquid with a distinctive, characteristic odor. It has a molecular weight of 118.19 and a specific gravity of 0.91 (H2O = 1). The compound boils at 165.6°C and has a freezing/melting point of 23.3°C. Its vapor pressure is measured at 2 mmHg at 20°C, and the flash point is 54°C. The autoignition temperature of methylstyrene is 574°C. It has a wide explosive range, with lower explosive limits (LEL) of 1.9% and upper explosive limits (UEL) of 6.1%. Due to its volatility and flammability, methylstyrene should be handled with caution, particularly in environments where high temperatures or open flames could trigger combustion. The compound's relatively low melting point and vapor pressure make it highly sensitive to temperature changes, further emphasizing the need for proper storage and handling conditions.
Parameters
Melting point | −24 °C(lit.) |
Boiling point | 165-169 °C(lit.) |
density | 0.909 g/mL at 25 °C(lit.) |
vapor density | 4.1 (vs air) |
vapor pressure | 2.1 mm Hg ( 20 °C) |
refractive index | n20/D 1.539 |
Fp | 114 °F |
storage temp. | 2-8°C |
solubility | 560mg/l |
form | Liquid |
color | Clear colorless |
PH | 5-6 (500g/l, H2O) |
explosive limit | 0.9-6.6%(V) |
Water Solubility | insoluble |
BRN | 969405 |
Exposure limits | NIOSH REL: TWA 50 ppm (240 mg/m3), STEL 100 ppm (485 mg/m3), IDLH 700 ppm; OSHA PEL: ceiling 100 ppm; ACGIH TLV: TWA 50 ppm, STEL 100 ppm (adopted). |
Dielectric constant | 2.2799999999999998 |
InChIKey | XYLMUPLGERFSHI-UHFFFAOYSA-N |
LogP | 3.48 at 25℃ |
CAS DataBase Reference | 98-83-9(CAS DataBase Reference) |
IARC | 2B (Vol. 101) 2013 |
NIST Chemistry Reference | «alpha»-Methylstyrene(98-83-9) |
EPA Substance Registry System | .alpha.-Methylstyrene (98-83-9) |
Safety Information
Hazard Codes | Xi,N |
Risk Statements | 10-36/37-51/53 |
Safety Statements | 61 |
RIDADR | UN 2303 3/PG 3 |
OEB | A |
OEL | TWA: 50 ppm (240 mg/m3), STEL: 100 ppm (485 mg/m3) |
WGK Germany | 2 |
RTECS | WL5075300 |
Autoignition Temperature | 445 °C |
TSCA | Yes |
HS Code | 2902 90 00 |
HazardClass | 3 |
PackingGroup | III |
Hazardous Substances Data | 98-83-9(Hazardous Substances Data) |
Toxicity | LD50 orally in Rabbit: 4900 mg/kg |
IDLA | 700 ppm |
