Chemical and Filtration Products of Texas
CAS 100-42-5|C₈H₈

Styrene Monomer

Inhibited aromatic monomer — essential feedstock for polystyrene, unsaturated polyester resins, SBR rubber, and ABS engineering plastics.

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Flash Point

31 °C (88 °F)

Boiling Point

145 °C

Inhibitor

TBC 10–50 ppm

Packaging

Drum / Tote / Bulk

Physical Properties

Molecular FormulaC₈H₈
Molecular Weight104.15 g/mol
CAS Number100-42-5
Boiling Point145 °C (293 °F)
Melting Point−30.6 °C (−23.1 °F)
Flash Point31 °C (88 °F) — Flammable
Density0.909 g/cm³ at 20 °C
Vapor Pressure0.67 kPa at 20 °C
Solubility in Water0.03 g/100 mL at 20 °C
Refractive Index1.5469 at 20 °C
Viscosity0.76 mPa·s at 20 °C
Auto-ignition Temp.490 °C (914 °F)
CH₂C₈H₈ | MW 104.15 g/mol | CAS 100-42-5

Grades & Packaging

IndustrialInhibited (4-tert-butylcatechol)
55-gal Drums275-gal TotesBulk Tanker

Industrial Applications

Polystyrene & EPS

Primary monomer for general-purpose polystyrene (GPPS), high-impact polystyrene (HIPS), and expanded polystyrene (EPS) foam used in packaging and insulation.

Unsaturated Polyester Resins

Reactive diluent and cross-linking monomer in unsaturated polyester resins (UPR) for fiberglass composites, marine, and construction applications.

Styrene-Butadiene Rubber (SBR)

Comonomer in SBR synthetic rubber used in tires, conveyor belts, and footwear.

ABS & SAN Resins

Monomer in acrylonitrile-butadiene-styrene (ABS) and styrene-acrylonitrile (SAN) engineering plastics.

Coatings & Adhesives

Reactive solvent and monomer in styrene-acrylic copolymer coatings, contact adhesives, and sealants.

Ion Exchange Resins

Feedstock for divinylbenzene-crosslinked polystyrene ion exchange resins used in water treatment and chemical processing.

Safety & Regulatory

NFPA Health2 — Moderate hazard
NFPA Flammability3 — Serious hazard
NFPA Reactivity2 — Unstable (polymerizes)
OSHA PEL (TWA)100 ppm (420 mg/m³)
ACGIH TLV (TWA)20 ppm
DOT Hazard Class3 — Flammable Liquid
UN NumberUN 2055
Packing GroupIII
Inhibitor4-tert-Butylcatechol (TBC), 10–50 ppm

Polymerization Hazard

Styrene can polymerize exothermically if inhibitor is depleted or if exposed to heat, light, or peroxides. Store in cool, dark conditions. SDS available upon request.

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Inhibited industrial grade in drums, totes, and bulk tanker delivery across Texas and the Gulf Coast.

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