Benzene laser cleaning visualization showing process effects
Alessandro Moretti
Alessandro MorettiPh.D.Italy
Laser-Based Additive Manufacturing
Published
Jan 6, 2026

Benzene Compound

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

Chemical Properties

Chemical Identity

CAS Number
71-43-2
Formula
C₆H₆
Molecular Weight
78.11 g/mol

Exposure Limits Comparison

Health Effects

Leukemia
Yes
Bone Marrow Damage
Yes
Blood Disorders
Yes
Dizziness
Yes
Drowsiness
Yes
Detection Monitoring
SensorTypes
  • Photoionization detector (PID)
  • Infrared
  • Flame ionization detector (FID)
  • Colorimetric tubes
DetectionRange
0-10 ppm typical, 0-100 ppm extended
AlarmSetpoints
Low
1 ppm (OSHA PEL)
High
5 ppm (OSHA STEL)
Evacuate
500 ppm (NIOSH IDLH)
ColorimetricTubes
  • Dräger CH25801
  • Gastec 121
  • Kitagawa 118
AnalyticalMethods
MethodTechniqueDetectionLimit
NIOSH 1501GC-FID (Gas Chromatography - Flame Ionization)0.01 ppm
OSHA 12GC-FID with charcoal tube0.01 ppm
OdorThreshold
NOT reliable indicator. Odor threshold (1.5-4.7 ppm) is above safe exposure levels and varies greatly. Do not rely on odor - use monitoring equipment.
Environmental Impact
AquaticToxicity
Toxic to aquatic organisms. LC50 (fish, 96h): 5.3-5.9 mg/L (rainbow trout). Toxic to algae and invertebrates.
Biodegradability
Readily biodegradable under aerobic conditions. >60% degradation in 28 days.
Bioaccumulation
Low potential. Log Kow: 2.13 (does not bioaccumulate significantly)
SoilMobility
High mobility. Low soil adsorption. May leach to groundwater.
AtmosphericFate
Photooxidation half-life: 4-17 days. Reacts with hydroxyl radicals. Does not undergo direct photolysis.
OzoneDepletion
false
ReportableReleases
Water
10 lbs (4.54 kg) to navigable waters (CWA Section 311)
Air
10 lbs/day (CERCLA RQ)
Ppe Requirements
Respiratory
NIOSH-approved organic vapor respirator with full facepiece for >10 ppm, SCBA or supplied-air for >50 ppm or unknown concentrations
Eye Protection
Chemical safety goggles and face shield for splash potential
Skin Protection
Nitrile gloves (>0.5mm), butyl rubber gloves, chemical-resistant clothing, impervious suit for spill response
Reactivity
Stability
Stable under normal conditions. May polymerize with aluminum chloride catalyst.
Polymerization
Will not occur under normal conditions.
IncompatibleMaterials
  • Strong oxidizers
  • Halogens
  • Nitric acid
  • Sulfuric acid
  • Perchlorates
  • Permanganates
  • Peroxides
  • Aluminum chloride (catalyst)
HazardousDecomposition
  • Carbon monoxide
  • Carbon dioxide
  • Irritating and toxic fumes
ConditionsToAvoid
  • Heat
  • Flames
  • Sparks
  • Static discharge
  • Oxidizers
  • High temperatures
ReactivityHazard
Reacts violently with strong oxidizers causing fire and explosion hazard. Attacks some forms of plastics, rubber, and coatings.
Regulatory Classification
UnNumber
UN1114
DotHazardClass
3 (Flammable liquid)
DotLabel
Flammable Liquid
NfpaCodes
Health
2
Flammability
3
Reactivity
0
Instability
0
EpaHazardCategories
  • Acute toxicity
  • Flammability
  • Carcinogenicity
  • Germ cell mutagenicity
  • Reproductive toxicity
  • Specific target organ toxicity (repeated exposure)
  • Aspiration hazard
SaraTitleIii
true
CerclaRq
10 pounds (4.54 kg)
RcraCode
U019

Contaminants That Produce Benzene

Benzene 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

Paint Residue / Coating Failure Laser Cleaning

No metadata available

Rubber Compound Residue

No metadata available

Industrial Oil / Grease Buildup Laser Cleaning

No metadata available

Machining Coolant Residue

Chemical Properties

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

Physical Properties

Chemical and physical characteristics
BoilingPoint
80.1°C (176°F)
MeltingPoint
5.5°C (42°F)
VaporPressure
95 mmHg @ 25°C
VaporDensity
2.77 (Air=1)
SpecificGravity
0.8765 @ 20°C
FlashPoint
-11°C (12°F) closed cup
AutoignitionTemp
498°C (928°F)
ExplosiveLimits
LEL: 1.2%, UEL: 7.8%
Appearance
Clear, colorless to pale yellow liquid
Odor
Sweet, aromatic odor; Odor threshold: 1.5-4.7 ppm (variable, not reliable)

Alternative Names

Synonyms and chemical identifiers
Synonyms
  • Benzol
  • Benzole
  • Phenyl hydride
  • Cyclohexatriene
  • Pyrobenzol
  • Coal naphtha
  • Mineral naphtha
CommonTradeNames
  • Benzol
  • Motor benzol
OtherIdentifiers
RtecsNumber
CY1400000
EcNumber
200-753-7
PubchemCid
241

Health Effects

Adverse health impacts from exposure to this compound
Route
inhalation
Effect
Central nervous system depression (dizziness, headache, confusion)
Severity
moderate
Onset
immediate
Route
inhalation
Effect
Increased risk of leukemia and aplastic anemia
Severity
severe
Onset
long-term
Route
skin_contact
Effect
Skin irritation and dermatitis due to defatting
Severity
low
Onset
short-term
Route
eye_contact
Effect
Irritation, redness, and tearing
Severity
low
Onset
immediate

Personal Protective Equipment

Required safety equipment for handling this compound
Respiratory
NIOSH-approved organic vapor respirator with full facepiece for >10 ppm, SCBA or supplied-air for >50 ppm or unknown concentrations
Skin
Nitrile gloves (>0.5mm), butyl rubber gloves, chemical-resistant clothing, impervious suit for spill response
Eye
Chemical safety goggles and face shield for splash potential
MinimumLevel
Level B for spill response, Level C for operations <50 ppm
SpecialNotes
Benzene is absorbed through skin - full body protection required. Change contaminated clothing immediately, do not reuse without decontamination.

Exposure Limits

OSHA, NIOSH, and ACGIH exposure thresholds
OshaPelPpm
1
OshaPelMgM3
3.2
NioshRelPpm
0.1
NioshRelMgM3
0.32
AcgihTlvPpm
0.5
AcgihTlvMgM3
1.6
WorkplaceExposure
OshaPel
twa8Hr: 1 ppm
stel15Min: null
ceiling: 5 ppm
NioshRel
twa8Hr: 0.1 ppm
stel15Min: 1 ppm
ceiling: null
idlh: 500 ppm
AcgihTlv
twa8Hr: 0.5 ppm
stel15Min: 2.5 ppm
ceiling: null
BiologicalExposureIndices
0: [object Object]
1: [object Object]

Storage Requirements

Safe storage conditions and compatibility
TemperatureRange
Store below 25°C (77°F) in cool area
Ventilation
Local exhaust ventilation required, explosion-proof equipment, minimum 100 ft/min face velocity
Incompatibilities
  • Strong oxidizers
  • Halogens (chlorine, bromine)
  • Nitric acid
  • Sulfuric acid
  • Perchlorates
  • Permanganates
  • Peroxides
ContainerMaterial
Steel, stainless steel, or aluminum containers. Avoid plastics that dissolve in benzene.
Segregation
Separate from oxidizers, acids, halogens. Store in approved flammable liquid storage cabinet. Keep away from heat, sparks, open flames.
QuantityLimits
Flammable liquid storage per 29 CFR 1910.106: Maximum 10 gallons outside approved cabinet, 60 gallons inside safety cabinet
SpecialRequirements
Store in tightly sealed containers in cool, dry, well-ventilated area. Ground and bond containers during transfer. Use explosion-proof electrical equipment.

Emergency Response

Procedures for spills, exposure, and incidents
FireHazard
Highly flammable liquid. Vapors heavier than air, may travel to ignition source. Forms explosive mixtures with air.
FireSuppression
Dry chemical, CO2, alcohol-resistant foam. Water spray to cool containers and disperse vapors. Do not use direct water stream.
SpillProcedures
Evacuate area, eliminate ignition sources, ventilate confined spaces, contain with absorbent (sand, vermiculite), prevent entry to waterways, collect in sealed containers
ExposureImmediateActions
Remove to fresh air immediately. Remove contaminated clothing. Wash skin with soap and water for 15+ minutes. Flush eyes for 15+ minutes. Seek immediate medical attention - benzene poisoning can be delayed.
EnvironmentalHazards
Toxic to aquatic life. Floats on water. Volatile - evaporates rapidly. Report spills >10 lbs to CERCLA.
SpecialHazards
Carcinogen - causes leukemia. May cause bone marrow depression with chronic exposure. Decomposes producing toxic carbon monoxide and carbon dioxide.

Regulatory Classification

DOT, UN, and NFPA hazard classifications
UnNumber
UN1114
DotHazardClass
3 (Flammable liquid)
DotLabel
Flammable Liquid
NfpaCodes
Health
2
Flammability
3
Reactivity
0
Special
null
Instability
0
EpaHazardCategories
  • Acute toxicity
  • Flammability
  • Carcinogenicity
  • Germ cell mutagenicity
  • Reproductive toxicity
  • Specific target organ toxicity (repeated exposure)
  • Aspiration hazard
SaraTitleIii
true
CerclaRq
10 pounds (4.54 kg)
RcraCode
U019

Environmental Impact

Toxicity, biodegradability, and environmental fate
AquaticToxicity
Toxic to aquatic organisms. LC50 (fish, 96h): 5.3-5.9 mg/L (rainbow trout). Toxic to algae and invertebrates.
Biodegradability
Readily biodegradable under aerobic conditions. >60% degradation in 28 days.
Bioaccumulation
Low potential. Log Kow: 2.13 (does not bioaccumulate significantly)
SoilMobility
High mobility. Low soil adsorption. May leach to groundwater.
AtmosphericFate
Photooxidation half-life: 4-17 days. Reacts with hydroxyl radicals. Does not undergo direct photolysis.
OzoneDepletion
false
ReportableReleases
Water
10 lbs (4.54 kg) to navigable waters (CWA Section 311)
Air
10 lbs/day (CERCLA RQ)

FAQ

Common Questions and Answers
As a laser cleaning operator working on equipment that may release benzene vapors due to its volatility, what protection methods should I use to stay below exposure limits?
Prioritize engineering controls like local exhaust ventilation to capture volatile benzene emissions at the source, aiming to keep airborne concentrations below the OSHA PEL of 1 ppm (8-hour TWA) or the ACGIH TLV of 0.5 ppm. Wear a NIOSH-approved half-face respirator with organic vapor cartridges (e.g., N95 or better with OV filter) during operations, and use chemical-resistant gloves and protective clothing to prevent skin contact. Regularly monitor air quality with a photoionization detector (PID) calibrated for benzene to ensure levels remain safe and trigger immediate evacuation if thresholds are approached.

Detection & Monitoring

Methods for detecting and measuring this compound
SensorTypes
  • Photoionization detector (PID)
  • Infrared
  • Flame ionization detector (FID)
  • Colorimetric tubes
DetectionRange
0-10 ppm typical, 0-100 ppm extended
AlarmSetpoints
Low
1 ppm (OSHA PEL)
High
5 ppm (OSHA STEL)
Evacuate
500 ppm (NIOSH IDLH)
ColorimetricTubes
  • Dräger CH25801
  • Gastec 121
  • Kitagawa 118
AnalyticalMethods
  • [object Object]
  • [object Object]
OdorThreshold
NOT reliable indicator. Odor threshold (1.5-4.7 ppm) is above safe exposure levels and varies greatly. Do not rely on odor - use monitoring equipment.

Reactivity

Chemical reactivity and incompatibilities
Stability
Stable under normal conditions. May polymerize with aluminum chloride catalyst.
Polymerization
Will not occur under normal conditions.
IncompatibleMaterials
  • Strong oxidizers
  • Halogens
  • Nitric acid
  • Sulfuric acid
  • Perchlorates
  • Permanganates
  • Peroxides
  • Aluminum chloride (catalyst)
HazardousDecomposition
  • Carbon monoxide
  • Carbon dioxide
  • Irritating and toxic fumes
ConditionsToAvoid
  • Heat
  • Flames
  • Sparks
  • Static discharge
  • Oxidizers
  • High temperatures
ReactivityHazard
Reacts violently with strong oxidizers causing fire and explosion hazard. Attacks some forms of plastics, rubber, and coatings.

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: