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MSDS Material Safety Data Sheet
CAS

100-42-5
98-29-3

File Name: emsdiasum_com---21500.asp
                            EMS CATALOG NO:             21500
EMS PRODUCT: Styrene Monomer
DATE: 10/18/2007
PAGE NUMBER: One of 6


MATERIAL SAFETY DATA SHEET

The information contained herein is based on data considered accurate. However, no warranty
is expressed or implied regarding the accuracy of these data or the results to be obtained from
the use thereof.

Electron Microscopy Sciences assumes no responsibility for personal injury or property damage to
vendees, users or third parties caused by the material. Such vendees or users assume all risks
associated with the use of the material.


ELECTRON MICROSCOPY SCIENCES
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24 HOUR EMERGENCY PHONE NUMBER CHEMTREC: (800) 424-9300

FOR PRODUCT AND SALES INFORMATION

CONTACT ELECTRON MICROSCOPY SCIENCES OFFICE ABOVE.

PRODUCT IDENTIFICATION

Product Name: STYRENE MONOMER
Product Number: 21500
Chemical Name: Styrene
CAS Number: 100-42-5
Chemical Family: N/A
Synonyms: Vinylbenzene

Composition/Information on Ingredients

Concentration by Wt./Mol% Component Name: CAS #. EU Inventory Number:
Avg. Min. Max.
Styrene 100-42-5 EINECS 202-851-5 99.8
P-Tertiary Butyl Catechol 98-29-3 EINECS 202-653-9 0.01

HAZARD IDENTIFICATION

Physical State: Liquid.
Color: Colorless.
Odor: Aromatic, sweet odor.
Potential Health Effects
Routes of Exposure: Dermal contact. Eye contact. Inhalation. Ingeston.
Signs and Symptoms of Acute Exposure: See component summary.
飥燬tyrene It may cause irritation to the respiratory tract and to other mucous membranes.
Moderate eye irritant. Moderate skin irritant. Slight ingestion hazard.
Skin: May cause delayed skin irritation and blistering.
Inhalation: Overexposure may cause irritation to the respiratory tract and to other mucous
membranes.
Eye: May cause moderate irritation, including burning sensation, tearing, redness or swelling.
Ingestion: This material may be a slight health hazard if ingested in large quantities.
Chronic Health Effects: See component summary.
飥燬tyrene This material has been classified by IARC as a group 2B substance (possibly carcinogenic
to humans). Repeated or prolonged exposure to styrene may cause nausea, loss of
Appetite, CNS depression, and general weakness.
Conditions Aggravated by Exposure:
This material or its emissions may affect the central nervous system (CNS) and/or
aggravate pre-existing CNS disorders.

FIRST AID MEASURES

General: After adequate first aid, no further treatment is required unless symptoms reappear.
Inhalation: If overcome by exposure, remove victim to fresh air immediately. Give oxygen or
artificial respiration as needed. Obtain medical attention if breathing difficulty persists.
Eye: In case of eye contact, immediately rinse with clean water for 20-30 minutes. Retract
eyelids often. Obtain emergency medical attention.
Skin: Promptly remove soiled clothing/wash thoroughly before reuse. Wash skin thoroughly with
mild soap and water. Flush with lukewarm water for 15 minutes. If sticky, use waterless cleaner
first. Seek medical attention if ill effect or irritation develops.
Ingestion: If large quantity swallowed, give lukewarm water (pint/ 1/2 litre) if victim completely
conscious/alert. Do not induce vomiting. Risk of damage to lungs exceeds poisoning risk.
Obtain emergency medical attention.
Physician's Detoxification Procedures:
No detoxification information available. Treatment of overexposure should be directed at
the control of symptoms and the clinical condition of the patient. Treat symptomatically.

FIRE FIGHTING MEASURES

Flash Point / Method: ~ 31.1掳C(88掳F)(Closed Cup)
Auto-Ignition Temperature: 490 掳C (914 掳F)
Flammable Limits:
LOWER: 1.1 vol%
UPPER: 6.1 vol%
Hazardous Combustion Products:
Thermal decomposition may produce carbon monoxide and other toxic vapors.
Special Conditions to Avoid:
Releases flammable vapors below normal ambient temperatures. May polymerize
explosively when involved in a fire.
Suitable: SMALL FIRE: Use dry chemical, CO2, water spray or regular foam LARGE
FIRES: water spray water fog and/or foam
Extinguishing Media:
Unsuitable: Do not use solid water stream.
Fire Fighting Instructions:
Protective Equipment/Clothing: Wear positive pressure self-contained breathing apparatus
(SCBA). Structural firefighters protective clothing will only provide limited protection.



2
INSTRUCTIONS: Fight fire from maximum distance or use unmanned hose holders or
monitor nozzles. Move containers form fire area if you can do it without risk. Cool containers with
flooding quantities of water until well after fire is out. Withdraw immediately in case of rising
sound from venting safety devices or discoloration of tank. Always stay away from tanks engulfed
in fire. For massive fire, use unmanned hose holders or monitor nozzles; if this is impossible,
withdraw from area and let fire burn.

ACCIDENTAL RELEASE MEASURES

Release Response: Eliminate all sources of ignition. All equipment used when handling this
product must be grounded. Do not touch or walk through spilled material. Stop leak if you can do
it without risk. Prevent entry into waterways, sewers, basements or confined areas. A vapor
suppressing foam may be used to reduce vapors. Absorb or cover with dry earth, sand or other
non-combustible material and transfer to containers. Use clean non-sparking tools to collect
absorbed material.
Regulation Component TPQ RQ
EPA/DOT RQ Styrene / CAS# 100-42-5. 454 KG / 1,000 lbs

HANDLING AND STORAGE

Handling: Do not handle near heat, sparks, or flame. Avoid contact with incompatible agents.
Use only with adequate ventilation/personal protection. Avoid contact with eyes, skin and
clothing. Do not enter storage area unless adequately ventilated. Metal containers involved in the
transfer of this material should be grounded and bonded.
Storage: Keep containers tightly closed when not in use and store in a well-ventilated area.
Isolate incompatible materials such as oxidizers. Containers should be clearly labeled. Metal
containers used to store this material should be grounded. Monitor inhibitor to maintain
appropriate concentration.

EXPOSURE CONTROLS AND PERSONAL PROTECTION

Engineering Controls:
Use process enclosures, local exhaust ventilation, or other engineering controls to keep
airborne levels below recommended exposure limits.
Personal Protection:
Inhalation: If exposure can exceed the standard, use only approved purifying or supplied air
respirator operated in a positive pressure mode.
Skin: When skin contact is possible, protective clothing including gloves, apron, sleeves, boots,
head and face protection should be worn.
Eye: Eye protection such as chemical splash goggles and/or face shield must be worn when
possibility exists for eye contact due to splashing or spraying liquid, airborne particles, or vapor.
Other Hygienic Practices:
Emergency eye wash fountains and safety showers should be available in the immediate
vicinity of any potential exposure. Selection of appropriate personal protective equipment
should be based on an evaluation of the performance characteristics of the protective
equipment relative to the task(s) to be performed, conditions present, duration of use, and
the hazards and/or potential hazards that may be encountered during use.
Recommended Work Practices Use good personal hygiene practices. Wash hands before
eating, drinking, smoking, or using toilet facilities. Promptly remove soiled clothing/wash
thoroughly before reuse.




3
Occupational Exposure Limits:
Component Name: Source / Date Value / Units Type Notation Carcinogenic Listing*
Styrene US (ACGIH) / 2001 20 ppm
85 mg/m3
BEI
8 HRS / TWA. No 2
US (ACGIH) / 2001 40 ppm
170 mg/m3
15 MIN / STEL. No
P-Tertiary Butyl Catechol US (ACGIH) N/L N/L
*1 = OSHA 2 = IARC 3 = NTP 4 = Others N/L = Not Listed See Section 11 for more
information

PHYSICAL AND CHEMICAL PROPERTIES

Density: ~ 900 kg/m3, @ (25 掳C/77 掳F)
Specific Gravity: ~ 0.90, @ (25 掳C/77 掳F), (Water = 1) Vapor: ~ 3.6, @ (15 - 20 掳C/59-68 F),
(Air = 1.0)
Boiling Point: ~ 146 掳C/295 掳F, @ 760 mm Hg pH: Not applicable.
Vapor Pressure: ~ 4.5 mm Hg, @ (20 掳C /68 掳F) Viscosity: No Data Available.
Solubility: Solubility (Water): Negligible (Less Than .1 Percent).
Melting/Freezing Point: ~ -31 掳C/-23 掳F
Evaporation Rate: No Data Available.
Molecular Weight: 104.16 g/mol
Other Physical & Chemical Properties: Additional properties may be listed in other Sections

STABILITY AND REACTIVITY

Chemical Stability: This product is stable with an appropriate level of TBC inhibitor (minimum
10 ppm),but reactive (unstable) without. Contact a company sales representative for information
regarding adequate inhibitor levels and methods of making inhibitor level determinations.
Conditions to Avoid: Avoid static discharge or other sources of ignition. Depleted inhibitor
levels. Extended contact with air or oxygen. Contaminants. High temperatures and severe
oxidizing conditions.
Incompatibility with: Peroxides. Strong oxidizing agents. Pure oxygen. Contaminants and
catalysts for vinyl polymers. Sulfuric acid. Alkali metal-graphite compounds. Aluminum chloride.
Strong acids. Strong alkalies. Copper. Copper alloys. Rubber.
Decomposition Products: On decomposition, emits acrid fumes.
Hazardous Polymerization: May occur.
Reactions with Air and Water: May react with oxygen to form peroxides.

TOXICOLOGICAL INFORMATION

Product Summary: See component summary.
CARCINOGENICITY: See component summary.
Component Summary:
Styrene
LC50 (Inhl)
Mouse 9,500 GM/M3 4 HOURS
Rat 12 GM/M3 4 HOURS




4
LD50 (Oral)
Rat 2,650 GM/KG
Mouse 316 MG/KG
Target Organ Effects Mucous membrane irritant. Moderate eye irritant.
CARCINOGENICITY: The International Agency for Research on Cancer (IARC, 1987) states
that styrene is 'possibly carcinogenic to humans' (Group 2B) based on 'inadequate evidence' in
humans, 'limited evidence' in animals and other 'relevant data.' According to the IARC report,
these 'other relevant data' include studies demonstrating that styrene is metabolized in humans
to styrene oxide, an agent which is known to induce cancers in two animal species. Subsequent
to this IARC evaluation, a long-term bioassay in CD-1 mice exposed to styrene vapors at 20, 40,
80, and 160 ppm showed a statistically significant increase in the incidence of lung adenomas, as
well as degenerative changes in the cell lining of the nasal tract. Additionally, styrene has been
shown to be mutagenic in several 'in vitro' assays. However, unlike some animal species, man
apparently is able to readily detoxify the styrene oxide generated from styrene exposures.
Moreover, studies in humans exposed to styrene for long periods of time have not demonstrated
any carcinogenic effects.

ECOLOGICAL INFORMATION

Ecotoxicity: This material may be harmful to aquatic species.
Toxicity to Fish:/Amphibians
Test type Species Value / Units
LC50 / 96 HOURS fathead minnow 32 mg/l
Toxicity to Aquatic: Inverterbrates:
Test type Species Value / Units EC50 / 48 HOURS daphnia 23 mg/l
Toxicity to Aquatic: Plants Test type Species Value / Units NOEC / algae > 200 mg/l
Environmental Fate:
This material is volatile and of low water solubility. Oxidation Half-Life: 0.528 days. Abiotic
Degradability: Hydrolysis Half-Life 0.3 days. Biotic Degradability: BOD 65%.
Bioaccumulation: This material is not expected to bioaccumulate.
Biodegradation: This material is expected to be readily biodegradable.

DISPOSAL CONSIDERATIONS

Assure effluent complies with applicable regulations. Landfill solids at permitted sites. Use
registered transporters. Avoid flame-outs. Assure emissions comply with applicable regulations.
Burn concentrated liquids in systems designed for low flash point material. Dilute with clean, low
viscosity fuel. Avoid overloading/poisoning plant biomass. Dilute aqueous waste may biodegrade.

TRANSPORT INFORMATION

Proper Shipping Name: Styrene monomer, stabilized
UN/NA ID: UN 2055
NAER Guidebook: 128P Marine Pollutant: No
Labels: Flammable liquid.
DOT Hazard Class: 3, PG III IMDG Hazard
Class: 3, PG III
ICAO/IATA
Hazard Class: 3, PG III
SECTION 15: REGULATORY INFORMATION
Regulatory Status: All components of this product are listed or are exempt from listing on the
TSCA 8(b) inventory. If identified components of this product are listed under the TSCA 12(b)



5
Export Notification rule, they will be listed below.
Other Regulatory Information: EU Labeling Information:

OTHER INFORMATION

DISCLAIMER OF RESPONSIBILITY: This document is generated for the purpose of
distributing health, safety, and environmental data. It is not a specification sheet nor should any
displayed data be construed as a specification. The information on this MSDS was obtained from
sources which we believe are reliable. However, the information is provided without any
warranty, expressed or implied, regarding its correctness. Some information presented and
conclusions drawn herein are from sources other than direct test data on the substance itself.
The conditions or methods of handling, storage, use and disposal of the product are beyond our
control and may be beyond our knowledge. For this and other reasons, we do not assume
responsibility and expressly disclaim liability for loss, damage, or expense arising out of or in any
way connected with handling, storage, use, or disposal of this product. If the product is used as a
component in another product, this MSDS information may not be applicable.

END OF DOCUMENT




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