Alpha-Methylstyrene
CAS Number: 98-83-9
Chemical Formula: C9H10
Synonyms:
alpha-Methylstyrene
Isopropenylbenzene
Appearance: Colorless liquid
HS Code: 2902 90 00
MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
Methylstyrene is a colorless liquid with a characteristic odor. Molecular weight = 118.19; Specific gravity(H2O:1) 0.91; Boiling point = 165.6℃; Freezing/Melting point −23.3℃; Vapor pressure 2 mmHg at 20℃; Flash point = 54℃; Autoignition temperature 574℃. Explosive limits: LEL 1.9%; UEL 6.1%.
Parameters
| Parameter | Value |
| 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 | n 20/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 | 2.28 |
| 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
| Item | Details |
| 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 |
Product Application of Alpha-Methylstyrene CAS #98-83-9
Alpha-Methylstyrene (CAS #98-83-9), also known as α-methylstyrene, serves as a key chemical feedstock with broad industrial uses. In polymer production, it can copolymerize with diverse monomers to manufacture ABS resin, styrene-butadiene rubber, and other materials, improving hardness, heat resistance, and impact resistance. In the coating sector, its polymers act as coating film formers, boosting chemical resistance and wear resistance of finished coatings.
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