Styrene laser cleaning visualization showing process effects
Yi-Chun Lin
Yi-Chun LinPh.D.Taiwan
Laser Materials Processing
Published
Jan 6, 2026

Styrene Compound

Styrene Compound safety information for laser cleaning. Health hazards, exposure limits, and protective equipment requirements.

Chemical Properties

Chemical Identity

CAS Number
100-42-5
Formula
C₈H₈
Molecular Weight
104.15 g/mol

Exposure Limits Comparison

Health Effects

Respiratory Irritation
Yes
Neurological Effects
Yes
Reproductive Toxicity
Yes
Suspected Carcinogen
Yes
Detection Monitoring
SensorTypes
  • Photoionization detector (PID)
  • Flame ionization detector (FID)
  • Infrared
DetectionRange
0-200 ppm typical
AlarmSetpoints
Low
20 ppm (ACGIH TLV)
High
50 ppm (NIOSH REL)
Evacuate
700 ppm (NIOSH IDLH)
ColorimetricTubes
  • Dräger Styrene 1/a
  • Gastec 132
AnalyticalMethods
MethodTechniqueDetectionLimit
NIOSH 1501GC-FID0.005 ppm
OSHA Method 89GC-FID0.01 ppm
OdorThreshold
0.05-0.5 ppm - WARNING: Olfactory fatigue occurs. Cannot rely on odor for protection.
Environmental Impact
AquaticToxicity
Toxic to aquatic life. LC50 (fish, 96h): 4-10 mg/L.
Biodegradability
Readily biodegradable (>60% in 28 days).
Bioaccumulation
Moderate bioaccumulation potential. BCF: 25-150. Log Kow: 2.95.
SoilMobility
Moderate mobility. Adsorbs to soil organic matter. Volatilizes from soil.
AtmosphericFate
Photolyzes via hydroxyl radicals. Atmospheric half-life: 1-2 days. Forms ozone.
OzoneDepletion
false
ReportableReleases
Water
1000 lbs to navigable waters
Air
1000 lbs/day (CERCLA RQ)
Ppe Requirements
Respiratory
NIOSH-approved organic vapor respirator for <50 ppm. SCBA for >50 ppm or unknown concentrations.
Eye Protection
Chemical safety goggles, face shield for splash hazard.
Skin Protection
Nitrile or butyl rubber gloves. Chemical-resistant clothing. Styrene absorbs through skin.
Reactivity
Stability
UNSTABLE. Polymerizes when heated or contaminated. Inhibitor required.
Polymerization
Exothermic polymerization with peroxides, oxidizers, or heat. May be explosive. Check inhibitor level.
IncompatibleMaterials
  • Oxidizers
  • Peroxides
  • Strong acids
  • Aluminum chloride
  • Copper
  • Brass
  • Iron compounds
  • Sulfuric acid
HazardousDecomposition
  • Carbon monoxide
  • Carbon dioxide
  • Toxic styrene vapors
  • Benzene
ConditionsToAvoid
  • Heat
  • Light
  • Oxidizers
  • Peroxides
  • Contamination
  • Sparks
  • Flames
ReactivityHazard
May polymerize violently. Reacts with oxidizers. Attacks some plastics, rubber, and coatings. Forms peroxides on prolonged storage.
Regulatory Classification
UnNumber
UN2055 (monomer, stabilized)
DotHazardClass
3 (Flammable liquid)
DotLabel
Flammable Liquid
NfpaCodes
Health
2
Flammability
3
Reactivity
2
Instability
2
EpaHazardCategories
  • Flammability
  • Acute toxicity
  • Carcinogenicity (probable)
  • Neurotoxicity
  • Aquatic toxicity
SaraTitleIii
true
CerclaRq
1000 pounds (454 kg)

Contaminants That Produce Styrene

Styrene is produced as a gaseous or particulate byproduct during laser ablation of contaminated surfaces. The generation rate and chemical form depend on the source contaminant and substrate combination. Proper exhaust ventilation and gas monitoring ensure safe working concentrations in laser cleaning enclosures.
No metadata available

Degraded Polymer Deposits

No metadata available

Rubber Compound Residue

Chemical Properties

Molecular formula, CAS number, molecular weight, and chemical structure
Type
chemical_properties
Id
styrene-physical-data

Physical Properties

Chemical and physical characteristics
BoilingPoint
145°C (293°F)
MeltingPoint
-30.6°C (-23°F)
VaporPressure
5 mmHg @ 20°C
VaporDensity
3.6 (Air=1)
SpecificGravity
0.906
FlashPoint
31°C (88°F) closed cup
AutoignitionTemp
490°C (914°F)
ExplosiveLimits
LEL: 1.1%, UEL: 6.1%
Appearance
Colorless to yellowish oily liquid
Odor
Sweet, floral odor @ 0.05-0.5 ppm (odor fatigue occurs)

Alternative Names

Synonyms and chemical identifiers
Synonyms
  • Vinyl benzene
  • Phenylethylene
  • Cinnamene
  • Styrol
  • Ethenylbenzene
CommonTradeNames
    OtherIdentifiers
    RtecsNumber
    WL3675000
    EcNumber
    202-851-5
    PubchemCid
    7501

    Health Effects

    Adverse health impacts from exposure to this compound
    Route
    inhalation
    Effect
    Central nervous system depression (dizziness, headache, fatigue)
    Severity
    moderate
    Onset
    immediate
    Route
    inhalation
    Effect
    Respiratory tract irritation and potential carcinogenic effects
    Severity
    high
    Onset
    long-term
    Route
    skin_contact
    Effect
    Skin irritation and dermatitis
    Severity
    low
    Onset
    short-term
    Route
    eye_contact
    Effect
    Eye irritation, redness, and possible corneal damage
    Severity
    moderate
    Onset
    immediate

    Personal Protective Equipment

    Required safety equipment for handling this compound
    Respiratory
    NIOSH-approved organic vapor respirator for <50 ppm. SCBA for >50 ppm or unknown concentrations.
    Skin
    Nitrile or butyl rubber gloves. Chemical-resistant clothing. Styrene absorbs through skin.
    Eye
    Chemical safety goggles, face shield for splash hazard.
    MinimumLevel
    Level C for <50 ppm, Level B for >50 ppm
    SpecialNotes
    Neurotoxin and probable carcinogen (IARC 2B). Skin absorption significant. Extremely irritating. May cause CNS depression.

    Exposure Limits

    OSHA, NIOSH, and ACGIH exposure thresholds
    OshaPelPpm
    100
    OshaPelMgM3
    425
    NioshRelPpm
    50
    NioshRelMgM3
    215
    AcgihTlvPpm
    20
    AcgihTlvMgM3
    85
    WorkplaceExposure
    OshaPel
    twa8Hr: 100 ppm
    stel15Min: null
    ceiling: 200 ppm
    NioshRel
    twa8Hr: 50 ppm
    stel15Min: 100 ppm
    ceiling: null
    idlh: 700 ppm
    AcgihTlv
    twa8Hr: 20 ppm
    stel15Min: 40 ppm
    ceiling: null
    BiologicalExposureIndices
    0: [object Object]
    1: [object Object]

    Storage Requirements

    Safe storage conditions and compatibility
    TemperatureRange
    Store below 32°C. Keep cool. Avoid excessive heat.
    Ventilation
    Local exhaust ventilation. Mechanical ventilation with emergency backup.
    Incompatibilities
    • Oxidizers
    • Peroxides
    • Strong acids
    • Aluminum chloride
    • Copper
    • Brass
    • Iron
    ContainerMaterial
    Stainless steel or aluminum. Must contain inhibitor (tert-butylcatechol). Check inhibitor level regularly.
    Segregation
    Separate from oxidizers by 20 feet. Flammable liquid storage cabinet.
    QuantityLimits
    Minimize quantities. Follow NFPA 30 for flammable liquids.
    SpecialRequirements
    CRITICAL: Store with polymerization inhibitor (10-15 ppm tert-butylcatechol). Monitor inhibitor level monthly. Avoid light and heat. Post "FLAMMABLE" and "CANCER HAZARD" signs. Date containers.

    Emergency Response

    Procedures for spills, exposure, and incidents
    FireHazard
    Flammable liquid. May polymerize explosively in fire. Vapors heavier than air. May travel to ignition sources.
    FireSuppression
    Stop flow if safe. Use dry chemical, CO2, alcohol-resistant foam. Water spray to cool containers. Do not use water jet on liquid. Prevent contamination - polymerization hazard.
    SpillProcedures
    Eliminate ignition sources. Ventilate area. Contain with sand or earth. Neutralize with sodium bisulfite. Dispose as hazardous waste. Check stabilizer level before handling.
    ExposureImmediateActions
    Remove to fresh air immediately. Eyes: flush with water for 15 minutes. Remove contaminated clothing - styrene penetrates. Wash skin thoroughly. Seek medical attention - neurotoxin and carcinogen exposure. Monitor for CNS effects.
    EnvironmentalHazards
    Toxic to aquatic life. Bioaccumulates. Report spills >1000 lbs.
    SpecialHazards
    PROBABLE HUMAN CARCINOGEN (IARC 2B). NEUROTOXIN - causes CNS depression, peripheral neuropathy. Irritating to eyes, skin, respiratory tract. May polymerize explosively. Olfactory fatigue - cannot rely on odor. Metabolized to styrene oxide (more toxic).

    Regulatory Classification

    DOT, UN, and NFPA hazard classifications
    UnNumber
    UN2055 (monomer, stabilized)
    DotHazardClass
    3 (Flammable liquid)
    DotLabel
    Flammable Liquid
    NfpaCodes
    Health
    2
    Flammability
    3
    Reactivity
    2
    Special
    null
    Instability
    2
    EpaHazardCategories
    • Flammability
    • Acute toxicity
    • Carcinogenicity (probable)
    • Neurotoxicity
    • Aquatic toxicity
    SaraTitleIii
    true
    CerclaRq
    1000 pounds (454 kg)

    Environmental Impact

    Toxicity, biodegradability, and environmental fate
    AquaticToxicity
    Toxic to aquatic life. LC50 (fish, 96h): 4-10 mg/L.
    Biodegradability
    Readily biodegradable (>60% in 28 days).
    Bioaccumulation
    Moderate bioaccumulation potential. BCF: 25-150. Log Kow: 2.95.
    SoilMobility
    Moderate mobility. Adsorbs to soil organic matter. Volatilizes from soil.
    AtmosphericFate
    Photolyzes via hydroxyl radicals. Atmospheric half-life: 1-2 days. Forms ozone.
    OzoneDepletion
    false
    ReportableReleases
    Water
    1000 lbs to navigable waters
    Air
    1000 lbs/day (CERCLA RQ)

    FAQ

    Common Questions and Answers
    As a laser cleaning operator working on surfaces potentially coated with styrene-based materials, what protective gear should I use to avoid skin irritation from exposure, especially since it's a stronger irritant than something like acetone?
    Wear chemical-resistant gloves made of nitrile or PVC (at least 0.7 mm thick) and full-body coveralls to prevent direct skin contact, as styrene penetrates skin more readily and causes greater irritation than milder solvents like acetone. Use safety goggles and a respirator with organic vapor cartridges if ventilation is inadequate, ensuring airborne exposure stays below the OSHA PEL of 100 ppm (8-hour TWA). Always perform a skin check after shifts and wash exposed areas immediately with soap and water if contact occurs.

    Detection & Monitoring

    Methods for detecting and measuring this compound
    SensorTypes
    • Photoionization detector (PID)
    • Flame ionization detector (FID)
    • Infrared
    DetectionRange
    0-200 ppm typical
    AlarmSetpoints
    Low
    20 ppm (ACGIH TLV)
    High
    50 ppm (NIOSH REL)
    Evacuate
    700 ppm (NIOSH IDLH)
    ColorimetricTubes
    • Dräger Styrene 1/a
    • Gastec 132
    AnalyticalMethods
    • [object Object]
    • [object Object]
    OdorThreshold
    0.05-0.5 ppm - WARNING: Olfactory fatigue occurs. Cannot rely on odor for protection.

    Reactivity

    Chemical reactivity and incompatibilities
    Stability
    UNSTABLE. Polymerizes when heated or contaminated. Inhibitor required.
    Polymerization
    Exothermic polymerization with peroxides, oxidizers, or heat. May be explosive. Check inhibitor level.
    IncompatibleMaterials
    • Oxidizers
    • Peroxides
    • Strong acids
    • Aluminum chloride
    • Copper
    • Brass
    • Iron compounds
    • Sulfuric acid
    HazardousDecomposition
    • Carbon monoxide
    • Carbon dioxide
    • Toxic styrene vapors
    • Benzene
    ConditionsToAvoid
    • Heat
    • Light
    • Oxidizers
    • Peroxides
    • Contamination
    • Sparks
    • Flames
    ReactivityHazard
    May polymerize violently. Reacts with oxidizers. Attacks some plastics, rubber, and coatings. Forms peroxides on prolonged storage.

    Incredibly fast, clean - and easy to do yourself.

    It's finally here in the Bay area. We'll arrive with everything you need. Try it out free: